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    7969 results match your criteria Acta Radiologica [Journal]

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    Use of single-view digital breast tomosynthesis (DBT) and ultrasound vs. additional views and ultrasound for the assessment of screen-detected abnormalities: German multi-reader study.
    Acta Radiol 2017 Jan 1:284185117732600. Epub 2017 Jan 1.
    1 National Reference Centre Mammography Munich, Munich, Germany.
    Background Data on the value of digital breast tomosynthesis (DBT) for further assessment of screen-detected lesions are still limited. Purpose To compare screening mammography, single-view DBT and ultrasound-information (TS) vs. screening mammography, additional views and ultrasound-information (AV) for assessment of screen-detected abnormalities. Read More

    Evaluation of image quality and radiation dose of abdominal dual-energy CT.
    Acta Radiol 2017 Jan 1:284185117732806. Epub 2017 Jan 1.
    1 Department of Translational Medicine - Medical Radiology, Lund University, Lund, Sweden.
    Background Dual-energy computed tomography (DECT) has conceptually been known since the late 1970s and commercially available as dual-source CT (DSCT) systems since 2006; however, the technique has not yet seen widespread implementation in routine protocols. Part of the cause for this is likely due to misconceptions about radiation dose and/or image quality when using DECT. Purpose To compare image quality and radiation dose of single-energy CT (SECT) and DECT abdominal examinations obtained in clinical practice on a second generation DSCT. Read More

    Prognostic value of perfusion CT in hepatocellular carcinoma treatment with sorafenib: comparison with mRECIST in longitudinal follow-up.
    Acta Radiol 2017 Jan 1:284185117732805. Epub 2017 Jan 1.
    1 Department of Diagnostic and Interventional Radiology, Eberhard-Karls-University, Tübingen, Germany.
    Background Targeted therapies are of increasing clinical importance and classic radiologic therapy response-criteria often fail to detect early therapeutic response or failure. For hepatocellular carcinoma (HCC), this is of major importance as therapeutic options are limited. Purpose To investigate the impact of sorafenib-treatment on intralesional perfusion using perfusion computed tomography (PCT) in HCC and to correlate the observed changes with mRECIST and the course of serum alpha-fetoprotein (AFP) for identification of their prognostic value. Read More

    Clinical value of the VTIQ technology in the differential diagnosis of superficially enlarged lymph nodes.
    Acta Radiol 2017 Jan 1:284185117732601. Epub 2017 Jan 1.
    Department of Ultrasound, Ningbo No. 2 Hospital, Ningbo, Zhejiang, PR China.
    Background Lymph node enlargement is a common clinical finding in clinical practice with different treatment strategies. Purpose To investigate the application of Virtual Touch Image Quantification (VTIQ) to diagnose benign and malignant superficial enlarged lymph nodes. Material and Methods Between December 2015 and August 2016, 116 superficial enlarged lymph nodes were examined by VTIQ. Read More

    In vivo MR spectroscopy predicts high tumor grade in endometrial cancer.
    Acta Radiol 2017 Jan 1:284185117733297. Epub 2017 Jan 1.
    1 Department of Radiology, Haukeland University Hospital, Bergen, Norway.
    Background In vivo magnetic resonance spectroscopy (MRS) enables non-invasive measurements of tumor metabolites. Choline-containing metabolites play a key role in tumor metabolism. Purpose To explore whether preoperative MRS-derived tumor choline levels are associated with clinical and histological features in endometrial carcinomas. Read More

    MRI findings and demographics of elastofibroma dorsi: assessment of diffusion-weighted imaging and contrast enhancement patterns.
    Acta Radiol 2017 Jan 1:284185117732099. Epub 2017 Jan 1.
    1 Department of Radiology, Graduate School of Medical Science, University of the Ryukyus, Okinawa, Japan.
    Background Elastofibroma dorsi is a rare pseudotumoral lesion. Thus, there is no report of magnetic resonance imaging (MRI) findings that investigates multiple patients particularly with respect to diffusion-weighted imaging (DWI) findings and contrast enhancement patterns. Purpose To describe the imaging findings of elastofibroma on MRI, particularly DWI findings and contrast enhancement patterns, and to further investigate patient demographics. Read More

    Imaging of rare appendicular non-acral soft-tissue chondromas in adults with histopathologic correlation.
    Acta Radiol 2017 Jan 1:284185117732100. Epub 2017 Jan 1.
    3 Department of Pathology, Faculty of Medicine, Health Sciences Center, Kuwait University, Safat, Kuwait.
    Background Soft-tissue chondroma (STC) is a rare benign soft tissue tumor that arises primarily in acral extra-skeletal locations. Occasionally, STCs may arise in more proximal non-acral locations, accompanied by non-classic features that label them as indeterminate lesions and pose diagnostic challenge for both radiologists and pathologists alike. Purpose To explicate the potential of diagnostic imaging in the identification and characterization of appendicular non-acral STCs with emphasis on their morphologic magnetic resonance imaging (MRI) enhancement. Read More

    Impact of region of interest (ROI) size on the diagnostic performance of shear wave elastography in differentiating solid breast lesions.
    Acta Radiol 2017 Jan 1:284185117732097. Epub 2017 Jan 1.
    3 Department of Radiology, Hallym Sacred Heart Hospital, Gyeonggi-do, Republic of Korea.
    Background Shear wave elastography (SWE) using a region of interest (ROI) can demonstrate the quantitative elasticity of breast lesions. Purpose To prospectively evaluate the impact of two different ROI sizes on the diagnostic performance of SWE for differentiating benign and malignant breast lesions. Material and Methods A total of 154 breast lesions were included. Read More

    Reduction of metal artifacts from unilateral hip arthroplasty on dual-energy CT with metal artifact reduction software.
    Acta Radiol 2017 Jan 1:284185117731475. Epub 2017 Jan 1.
    1 Department of Radiology, Cancer Hospital of China Medical University, LiaoNing Cancer Hospital, LiaoNing, PR China.
    Background The evaluation of hip arthroplasty is a challenge in computed tomography (CT). The virtual monochromatic spectral (VMS) images with metal artifact reduction software (MARs) in spectral CT can reduce the artifacts and improve the image quality. Purpose To evaluate the effects of VMS images and MARs for metal artifact reduction in patients with unilateral hip arthroplasty. Read More

    Apparent diffusion coefficient (ADC) does not correlate with different serological parameters in myositis and myopathy.
    Acta Radiol 2017 Jan 1:284185117731448. Epub 2017 Jan 1.
    2 Department of Diagnostic and Interventional Radiology, University of Leipzig, Leipzig, Germany.
    Background Magnetic resonance imaging (MRI) is widely used in several muscle disorders. Diffusion-weighted imaging (DWI) is an imaging modality, which can reflect microstructural tissue composition. The apparent diffusion coefficient (ADC) is used to quantify the random motion of water molecules in tissue. Read More

    Subchondral bone microarchitecture analysis in the proximal tibia at 7-T MRI.
    Acta Radiol 2017 Jan 1:284185117732098. Epub 2017 Jan 1.
    1 Center for Musculoskeletal Care, Department of Radiology, NYU School of Medicine, New York, NY, USA.
    Background Bone remodels in response to mechanical loads and osteoporosis results from impaired ability of bone to remodel. Bone microarchitecture analysis provides information on bone quality beyond bone mineral density (BMD). Purpose To compare subchondral bone microarchitecture parameters in the medial and lateral tibia plateau in individuals with and without fragility fractures. Read More

    MRI assessment of pituitary iron accumulation by using pituitary-R2 in β-thalassemia patients.
    Acta Radiol 2017 Jan 1:284185117730099. Epub 2017 Jan 1.
    2 Department of Radiology, 60521 Ege University Faculty of Medicine , Izmir, Turkey.
    Background Patients with thalassemia major (TM) require repeated blood transfusions, which leads to accumulation of iron in a wide variety of tissues. Accumulation of iron in the pituitary gland can lead to irreversible hypogonadotropic hypogonadism (HH) in this group of patients. Purpose To investigate the reliability of pituitary-R2 as a marker to estimate the extent of pituitary iron load by comparing the pituitary magnetic resonance imaging (MRI) findings with hepatic iron load and serum ferritin levels. Read More

    MRI evaluation of ligaments and tendons of foot arch in talar dome osteochondral lesions.
    Acta Radiol 2017 Jan 1:284185117730853. Epub 2017 Jan 1.
    Department of Radiology, Kayseri Training and Research Hospital, Kayseri, Turkey.
    Background There are no publications in literature describing an association between disorders of the ligaments and tendons supporting the foot arch and osteochondral lesions of the talus (OCLT). We believe there may be a correlation between the damage of these structures. Purpose To investigate the pathologies of main ligaments and tendons that support the foot arch in sprained ankles, by reviewing magnetic resonance imaging (MRI) studies and comparing the results in two groups of patients, with and without OCLT. Read More

    Role of acoustic radiation force impulse and shear wave velocity in prediction of preterm birth: a prospective study.
    Acta Radiol 2017 Jan 1:284185117730689. Epub 2017 Jan 1.
    1 Department of Radiodiagnosis, 471653 Teerthanker Mahaveer Medical College and Research Centre , Teerthanker Mahaveer University, Moradabad, India.
    Background Preterm birth is one of the important causes of neonatal morbidity where we rely on subjective criteria such as modified Bishop's scoring and contemporary sonographic measurement of cervical length. Acoustic radiation force impulse (ARFI) is a technological advancement in elastography that can be employed in prediction of cervical softening and preterm labor. Purpose To evaluate the role of ARFI technique and shear wave velocity (SWV) estimates as a predictor of preterm birth and its comparison with other clinical and sono-elastographic measures. Read More

    Impact on dose and image quality of a software-based scatter correction in mammography.
    Acta Radiol 2017 Jan 1:284185117730100. Epub 2017 Jan 1.
    1 Hospital Universitario Central de Asturias, Oviedo, Spain.
    Background In 2014, Siemens developed a new software-based scatter correction (Progressive Reconstruction Intelligently Minimizing Exposure [PRIME]), enabling grid-less digital mammography. Purpose To compare doses and image quality between PRIME (grid-less) and standard (with anti-scatter grid) modes. Material and Methods Contrast-to-noise ratio (CNR) was measured for various polymethylmethacrylate (PMMA) thicknesses and dose values provided by the mammograph were recorded. Read More

    Histogram analysis of apparent diffusion coefficient maps for the differentiation between lymphoma and metastatic lymph nodes of squamous cell carcinoma in head and neck region.
    Acta Radiol 2017 Jan 1:284185117730688. Epub 2017 Jan 1.
    1 Department of Radiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, PR China.
    Background To clarify the nature of cervical malignant lymphadenopathy is highly important for the diagnosis and differential diagnosis of head and neck tumors. Purpose To investigate the role of first-order apparent diffusion coefficient (ADC) histogram analysis for differentiating lymphoma from metastatic lymph nodes of squamous cell carcinoma (SCC) in the head and neck region. Material and Methods Diffusion-weighted imaging (DWI) data of 67 patients (lymphoma, n = 20; SCC, n = 47) with malignant lymphadenopathy were retrospectively analyzed. Read More

    Freehand 3T MR-guided vacuum-assisted breast biopsy (VAB): a five-year experience.
    Acta Radiol 2017 Jan 1:284185117730102. Epub 2017 Jan 1.
    2 Department of Diagnostic Senology, 9246 IRCCS Azienda Ospedaliera Universitaria San Martino IST-Istituto Nazionale per la Ricerca sul Cancro , Genoa, Italy.
    Background Magnetic resonance (MR) permits the detection of some malignant lesions that cannot be identified with mammography or ultrasonography. The characterization of these MR-only detectable lesions often requires a biopsy. Purpose To evaluate the technique, the feasibility and the accuracy of freehand 3T MR-guided VAB for the characterization of suspicious, MR-only detectable lesions and to compare VAB results with surgical pathology and follow-up imaging results. Read More

    Differentiation of grade II and III oligodendrogliomas from grade II and III astrocytomas: a histogram analysis of perfusion parameters derived from dynamic contrast-enhanced (DCE) and dynamic susceptibility contrast (DSC) MRI.
    Acta Radiol 2017 Jan 1:284185117728981. Epub 2017 Jan 1.
    2 Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, 65570 The Catholic University of Korea , Seoul, Republic of Korea.
    Background Since oligodendroglial tumors are sensitive to chemotherapy and have a better prognosis, the differentiation of oligodendroglial tumors (OT) from astrocytic tumors (AT) is important. Purpose To investigate the perfusion and permeability parameters that differentiate grade II and III OT from AT, using dynamic contrast-enhanced (DCE) and dynamic susceptibility contrast (DSC) magnetic resonance imaging (MRI). Material and Methods We retrospectively reviewed the DCE and DSC MRIs of 39 patients with OT (OTs, n = 19; grade II, n = 12 and grade III, n = 7) and AT (ATs, n = 20; grade II, n = 7 and grade III, n = 13). Read More

    What is the most suitable MR signal index for quantitative evaluation of placental function using Half-Fourier acquisition single-shot turbo spin-echo compared with T2-relaxation time?
    Acta Radiol 2017 Jan 1:284185117727786. Epub 2017 Jan 1.
    1 Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
    Background Half-Fourier acquisition single-shot turbo spin-echo (HASTE) imaging is now widely used for placental and fetal imaging because of its rapidity and low sensitivity to fetal movement. If placental dysfunction is also predicted by quantitative value obtained from HASTE image, then it might be beneficial for evaluating placental wellbeing. Purpose To ascertain the most suitable magnetic resonance (MR) signal indexes reflecting placental function using HASTE imaging. Read More

    Type 2 endoleaks in endovascular aortic repair: cone beam CT and automatic vessel detection to guide the embolization.
    Acta Radiol 2017 Jan 1:284185117729184. Epub 2017 Jan 1.
    1 Department of Diagnostic and Interventional Radiology, University of Milan, San Paolo Hospital, Milan, Italy.
    Background Dual-phase cone beam computed tomography (DP-CBCT) and automatic vessel detection (AVD) software are helpful tools for detecting arteries before planned endovascular interventions. Purpose To evaluate the usefulness of DP-CBCT and AVD software in guiding the trans-arterial embolization (TAE) of challenging T2 lumbar endoleaks (T2-L-EL). Material and Methods Ten patients with T2-L-EL were included in this study. Read More

    Prediction of high-stage liver fibrosis using ADC value on diffusion-weighted imaging and quantitative enhancement ratio at the hepatobiliary phase of Gd-EOB-DTPA-enhanced MRI at 1.5 T.
    Acta Radiol 2017 Jan 1:284185117725778. Epub 2017 Jan 1.
    1 Department of Radiology, Tokyo Medical University, Tokyo, Japan.
    Background Recently, diffusion-weighted imaging (DWI) and quantitative enhancement ratio measured at the hepatobiliary phase (HBP) of Gd-EOB-DTPA-enhanced magnetic resonance imaging (MRI) has been established as an effective method for evaluating liver fibrosis. Purpose To evaluate which is a more favorable surrogate marker in predicting high-stage liver fibrosis, apparently diffusion coefficient (ADC) value or quantitative enhancement ratio measured on HBP. Material and Methods Eighty-three patients with 99 surgically resected hepatic lesions were enrolled in this study. Read More

    Evaluation of vascular invasion in patients with musculoskeletal tumors of lower extremities: use of time-resolved 3D MR angiography at 3-T.
    Acta Radiol 2017 Jan 1:284185117729185. Epub 2017 Jan 1.
    1 Department of Radiology, Huashan Hospital, Fudan University, Shanghai, PR China.
    Background Time-resolved angiography with stochastic trajectories (TWIST) sequence makes considerable progress in temporal and spatial resolution, which presents high potential in evaluation of vascular diseases. Purpose To assess magnetic resonance imaging (MRI) using TWIST MR angiography (MRA) sequence in the assessment of vascular invasion for bone and soft-tissue tumors in comparison to computed tomography angiography (CTA) as the reference standard. Material and Methods Thirty-three patients with lower extremity musculoskeletal tumors were imaged with conventional MR and TWIST MRA. Read More

    Diagnostic value of apparent diffusion coefficient in differentiating between high-grade gliomas and brain metastases.
    Acta Radiol 2017 Jan 1:284185117727787. Epub 2017 Jan 1.
    1 37576 "Iuliu Hatieganu" University of Medicine and Pharmacy , Cluj-Napoca, Romania.
    Background High-grade gliomas (HGGs) and brain metastases (BMs) can display similar imaging characteristics on conventional MRI. In HGGs, the peritumoral edema may be infiltrated by the malignant cells, which was not observed in BMs. Purpose To determine whether the apparent diffusion coefficient values could differentiate HGGs from BMs. Read More

    Evaluation of an iterative model-based reconstruction of pediatric abdominal CT with regard to image quality and radiation dose.
    Acta Radiol 2017 Jan 1:284185117728415. Epub 2017 Jan 1.
    1 Medical Radiation Physics, Department of Translational Medicine, Lund University, Skåne University Hospital, Malmö, Sweden.
    Background In pediatric patients, computed tomography (CT) is important in the medical chain of diagnosing and monitoring various diseases. Because children are more radiosensitive than adults, they require minimal radiation exposure. One way to achieve this goal is to implement new technical solutions, like iterative reconstruction. Read More

    Intra-individual comparison of hepatocellular carcinoma imaging features on contrast-enhanced computed tomography, gadopentetate dimeglumine-enhanced MRI, and gadoxetic acid-enhanced MRI.
    Acta Radiol 2017 Jan 1:284185117728534. Epub 2017 Jan 1.
    6 Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Sungkyunkwan, Republic of Korea.
    Background Gadoxetic acid is being widely used for detection and characterization of hepatic nodules. However, there are no data regarding intra-individual comparison of imaging features of hepatocellular carcinoma (HCC) on dynamic computed tomography (CT), gadopentetate dimeglumine-enhanced magnetic resonance imaging (Gd-DTPA-MRI), and gadoxetic acid-enhanced MRI (Gd-EOB-MRI). Purpose To evaluate typical imaging features of HCC and capsule appearance with dynamic CT, Gd-DTPA-MRI, and Gd-EOB-MRI. Read More

    Quantitative and qualitative MRI evaluation of cerebral small vessel disease in an elderly population: a longitudinal study.
    Acta Radiol 2017 Jan 1:284185117727567. Epub 2017 Jan 1.
    1 Department of Surgical Sciences, Radiology, Uppsala University, Sweden.
    Background Cerebral white matter hyperintensities (WMHs), lacunes, and microbleeds are seen on magnetic resonance imaging (MRI) in small vessel disease (SVD). Purpose To assess SVD on MRI and its evolution over five years in an elderly population and to investigate whether relative cerebral blood flow (rCBF) at baseline was related to the progression of white matter (WM) lesions. Material and Methods In a population-based study, 406 participants aged 75 years underwent morphological MRI of the brain and 252 of them again at age 80 years. Read More

    Prominent deep medullary veins: a predictive biomarker for stroke risk from transient ischemic attack?
    Acta Radiol 2017 Jan 1:284185117726813. Epub 2017 Jan 1.
    1 Department of Radiology, General Hospital of Shenyang Military Area Command, Shenyang, PR China.
    Background Deep medullary veins (DMVs) are a biomarker of severity and prognosis in patients with acute cerebral infarction. However, their clinical significance remains unclear in patients with transient ischemic attack (TIA). Purpose To determine whether prominent deep medullary veins (PDMVs) are a predictive biomarker for stroke risk after TIA. Read More

    Feasibility of peripheral nerve MR neurography using diffusion tensor imaging adapted to skeletal muscle disease.
    Acta Radiol 2017 Jan 1:284185117726100. Epub 2017 Jan 1.
    1 Department of Diagnostic and Interventional Radiology and Nuclear Medicine, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany.
    Background Diffusion tensor imaging (DTI) of peripheral nerves may provide additional information about nerve involvement in muscular disorders, but is considered difficult due to different optimal scan parameters tailored to magnetic resonance (MR) signal properties of muscle and neural tissues. Purpose To assess the feasibility of sciatic nerve DTI using two different approaches of region of interest (ROI)-localization in DTI scans with b-values 500 s/mm(2), in participants with muscular disorders and in controls. Material and Methods DTI of the thigh was conducted on a 3T system in ten patients (6 men, 4 women; mean age =54 ± 15 years) with neuromuscular disorders and ten controls. Read More

    Shunt-preserving disconnection of the portal to systemic circulation in patients with hepatic encephalopathy.
    Acta Radiol 2017 Jan 1:284185117722810. Epub 2017 Jan 1.
    1 Department of Diagnostic Radiology, Graduate School of Life Sciences, Kumamoto University, Kumamoto, Japan.
    Background Portosystemic shunt obliteration by surgical or interventional radiological techniques can be effective for patients with hepatic encephalopathy (HE) although this approach is often associated with accumulation of ascites and/or formation of esophageal varices. Purpose To evaluate the clinical efficacy and safety of shunt-preserving disconnection of the portosystemic circulation (SPDPS) in patients with HE. Material and Methods Nine patients with HE and a splenorenal shunt were treated by SPDPS: eight underwent selective coil embolization of the splenic vein and one underwent stent-graft closure of the shunt. Read More

    Added value of 18F-FDG PET/CT in diagnosing infected hip prosthesis.
    Acta Radiol 2017 Jan 1:284185117726812. Epub 2017 Jan 1.
    1 Department of Radiology and Nuclear Medicine, Maastricht University Medical Center, Maastricht, The Netherlands.
    Background The diagnosis of infected hip prosthesis is frequently not straightforward yet very important as it changes treatment. Purpose To retrospectively investigate the added value of 18F-FDG PET/CT to conventional tests including radiography, erythrocyte sedimentation rate (ESR)/C-reactive protein (CRP) testing, and joint aspiration, in diagnosing infected hip prosthesis. Material and Methods Seventy-eight hip prostheses of 78 patients (55% men; mean age = 66. Read More

    Dermatofibroma: sonographic findings and pathologic correlation.
    Acta Radiol 2017 Jan 1:284185117721263. Epub 2017 Jan 1.
    3 Department of Dermatology, Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea.
    Background Ultrasound has been increasingly used for the evaluation of superficial soft tissue lesions. Dermatofibroma is one of the most common dermal lesions. Experiences in ultrasound examinations of dermatofibromas have been accumulated. Read More

    Ultra-low-dose lung screening CT with model-based iterative reconstruction: an assessment of image quality and lesion conspicuity.
    Acta Radiol 2017 Jan 1:284185117726099. Epub 2017 Jan 1.
    2 Department of Radiology, 220312 Pusan National University Hospital , Busan, Republic of Korea.
    Background Reducing radiation dose inevitably increases image noise, and thus, it is important in low-dose computed tomography (CT) to maintain image quality and lesion detection performance. Purpose To assess image quality and lesion conspicuity of ultra-low-dose CT with model-based iterative reconstruction (MBIR) and to determine a suitable protocol for lung screening CT. Material and Methods A total of 120 heavy smokers underwent lung screening CT and were randomly and equally assigned to one of five groups: group 1 = 120 kVp, 25 mAs, with FBP reconstruction; group 2 = 120 kVp, 10 mAs, with MBIR; group 3 = 100 kVp, 15 mAs, with MBIR; group 4 = 100 kVp, 10 mAs, with MBIR; and group 5 = 100 kVp, 5 mAs, with MBIR. Read More

    Role of ultrasound in the assessment of percutaneous laser ablation of cervical metastatic lymph nodes from thyroid carcinoma.
    Acta Radiol 2017 Jan 1:284185117721261. Epub 2017 Jan 1.
    Ruijin Hospital Affiliated to Shanghai JiaoTong University of Medicine School, Shanghai, PR China.
    Background Few studies have examined the feasibility and efficiency of performing ultrasound and contrast-enhanced ultrasound (CEUS) after percutaneous laser ablation (PLA) of cervical metastatic lymph nodes from thyroid cancer. Purpose To investigate and describe the use of conventional ultrasound and CEUS in evaluating PLA of metastatic lymph nodes. Material and Methods PLA was performed in a small, prospective, observational study of 21 metastatic lymph nodes in 17 thyroid cancer patients who underwent radical thyroid resection. Read More

    CT follow-up in patients with neuroendocrine tumors (NETs): combined radiation and contrast dose reduction.
    Acta Radiol 2017 Jan 1:284185117726101. Epub 2017 Jan 1.
    1 Department of Radiology Charité, Humboldt-University Medical School, Berlin, Germany.
    Background Frequent computed tomography (CT) follow-ups involve significant radiation related risks for patients with low-grade neuroendocrine tumors (NETs). Contrast agent (CA) application is essential for diagnostic evidence and has additional risks especially in patients with limited renal function. Purpose To investigate if a combination of dose and contrast agent (CA) reduction affects image quality and diagnostic evidence in neuroendocrine tumor (NET) patients. Read More

    Diagnostic performances of supplemental breast ultrasound screening in women with personal history of breast cancer.
    Acta Radiol 2017 Jan 1:284185117725779. Epub 2017 Jan 1.
    1 Department of Radiology, Seoul National University Hospital, Seoul, Republic of Korea.
    Background Supplemental breast ultrasonography (US) has been used as a surveillance imaging method in women with personal history of breast cancer (PHBC). However, there have been limited data regarding diagnostic performances. Purpose To evaluate diagnostic performances of supplemental breast US screening for women with PHBC and to compare with those for women without PHBC. Read More

    Analysis of risk factors causing short-term cement leakages and long-term complications after percutaneous kyphoplasty for osteoporotic vertebral compression fractures.
    Acta Radiol 2017 Jan 1:284185117725368. Epub 2017 Jan 1.
    Department of Radiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, PR China.
    Background Percutaneous kyphoplasty (PKP) is a common treatment modality for painful osteoporotic vertebral compression fractures (OVCFs). Pre- and postoperative identification of risk factors for cement leakage and follow-up complications would therefore be helpful but has not been systematically investigated. Purpose To evaluate pre- and postoperative risk factors for the occurrence of short-term cement leakages and long-term complications after PKP for OVCFs. Read More

    Image quality and radiation dose of CT venography with double dose reduction using model based iterative reconstruction: comparison with conventional CT venography using filtered back projection.
    Acta Radiol 2017 Jan 1:284185117725780. Epub 2017 Jan 1.
    4 Department of Cardiology, Kim Hae Gang-il Hospital, KyoungNam, Republic of Korea.
    Background Computed tomography venography (CTV) at low kVp using model-based iterative reconstruction (MBIR) can enhance vascular enhancement with noise reduction. Purpose To evaluate image qualities and radiation doses of CTV at 80 kVp using MBIR and a small iodine contrast media (CM) dose and to compare these with those of CTV performed using a conventional protocol. Material and Methods Sixty-five patients (mean age = 58. Read More

    Pancreatic neuroendocrine tumor: prediction of the tumor grade using CT findings and computerized texture analysis.
    Acta Radiol 2017 Jan 1:284185117725367. Epub 2017 Jan 1.
    1 Department of Radiology, Seoul National University Hospital, Seoul, Republic of Korea.
    Background Pancreatic neuroendocrine tumors (PNET) include heterogeneous tumors with a variable degree of inherent biologic aggressiveness represented by the histopathologic grade. Although several studies investigated the computed tomography (CT) characteristics which can predict the histopathologic grade of PNET, accurate prediction of the PNET grade by CT examination alone is still limited. Purpose To investigate the important CT findings and CT texture variables for prediction of grade of PNET. Read More

    Comparison of variability in breast density assessment by BI-RADS category according to the level of experience.
    Acta Radiol 2017 Jan 1:284185117725369. Epub 2017 Jan 1.
    2 University of Ulsan College of Medicine, Seoul, Republic of Korea.
    Background Only few studies have assessed variability in the results obtained by the readers with different experience levels in comparison with automated volumetric breast density measurements. Purpose To examine the variations in breast density assessment according to BI-RADS categories among readers with different experience levels and to compare it with the results of automated quantitative measurements. Material and Methods Density assignment was done for 1000 screening mammograms by six readers with three different experience levels (breast-imaging experts, general radiologists, and students). Read More

    Hepatocellular carcinoma with central scar on gadoxetic acid-enhanced and diffusion-weighted magnetic resonance imaging.
    Acta Radiol 2017 Jan 1:284185117723040. Epub 2017 Jan 1.
    1 Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
    Background Central scars are rarely reported in conventional hepatocellular carcinoma (HCC). The presence of central scars on imaging might lead to erroneous diagnosis of hepatic tumors. Purpose To determine imaging features of HCC with central scars on magnetic resonance imaging (MRI) including gadoxetic acid-enhanced and diffusion-weighted imaging (DWI). Read More

    Association between US features of primary tumor and axillary lymph node metastasis in patients with clinical T1-T2N0 breast cancer.
    Acta Radiol 2017 Jan 1:284185117723039. Epub 2017 Jan 1.
    1 Department of Radiology, Seoul National University College of Medicine and Seoul National University Hospital, Seoul, Republic of Korea.
    Background Most patients with early-stage breast cancer have clinically negative lymph nodes (LNs). However, 15-20% of patients have axillary nodal metastasis based on the sentinel LN biopsy. Purpose To assess whether ultrasound (US) features of a primary tumor are associated with axillary LN metastasis in patients with clinical T1-T2N0 breast cancer. Read More

    Prostate cancer: in-bore magnetic resonance guided biopsies at active surveillance inclusion improve selection of patients for active treatment.
    Acta Radiol 2017 Jan 1:284185117723372. Epub 2017 Jan 1.
    1 Department of Urology, Aarhus University Hospital, Skejby, Denmark.
    Background Active surveillance (AS) of low-risk prostate cancer (PCa) is an accepted alternative to active treatment. However, the conventional diagnostic trans-rectal ultrasound guided biopsies (TRUS-bx) underestimate PCa aggressiveness in almost half of the cases, when compared with the surgical specimen. Purpose To investigate if additional multi-parametric magnetic resonance imaging (mpMRI) of the prostate and MRI-guided in-bore biopsies (MRGB) at AS inclusion would improve selection of patients for active treatment. Read More

    Association of preoperative breast MRI features with locoregional recurrence after breast conservation therapy.
    Acta Radiol 2017 Jan 1:284185117723041. Epub 2017 Jan 1.
    1 Department of Radiology, Seoul National University Hospital, Seoul, Republic of Korea.
    Background Locoregional recurrence (LRR) following breast conservation therapy (BCT) is associated with an increased risk of distant metastasis and death in patients with breast cancer. Purpose To investigate whether preoperative breast magnetic resonance imaging (MRI) features are associated with the risk of LRR in patients undergoing BCT. Material and Methods A total of 3781 women with primary invasive breast cancer underwent preoperative MRI and BCT between 2003 and 2013. Read More

    Body composition predictors of therapy response in patients with primary extremity soft tissue sarcomas.
    Acta Radiol 2017 Jan 1:284185117723370. Epub 2017 Jan 1.
    2 Division of Musculoskeletal Imaging and Intervention, Department of Radiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
    Background Recent studies have suggested that the quantity and quality of adipose tissue and muscle, assessed on non-contrast computed tomography (CT), may serve as imaging biomarkers of survival in patients with and without neoplasms. Purpose To assess body composition measures that could serve as predictors of therapy response in patients with extremity soft tissue sarcomas treated with radiation therapy and surgery. Material and Methods The study was IRB-approved. Read More

    Evaluation of Parkinson's disease by neuromelanin-sensitive magnetic resonance imaging and (123)I-FP-CIT SPECT.
    Acta Radiol 2017 Jan 1:284185117722812. Epub 2017 Jan 1.
    Division of Radiology, Department of Pathophysiological and Therapeutic Sciences, Faculty of Medicine, Tottori University, Tottori, Japan.
    Background Both neuromelanin-sensitive magnetic resonance imaging (NmMRI) and (123)I-FP-CIT single photon emission computed tomography (SPECT) (DaTSCAN) assist the diagnosis of Parkinson's disease (PD). However, there have been few studies investigating a correlation between them. Purpose To correlate the utility of NmMRI and DaTSCAN and to evaluate the relationship between both imaging findings and the Unified PD rating scale part III (UPDRS III) score for the diagnosis and management of PD. Read More

    Comparison of bi-exponential and mono-exponential models of diffusion-weighted imaging for detecting active sacroiliitis in ankylosing spondylitis.
    Acta Radiol 2017 Jan 1:284185117722811. Epub 2017 Jan 1.
    1 Department of Radiology, Zhongshan Hospital, Fudan University and Shanghai Medical Imaging Institute, Department of Medical Imaging, Shanghai Medical School of Fudan University, Shanghai, PR China.
    Background There has been a growing need for a sensitive and effective imaging method for the differentiation of the activity of ankylosing spondylitis (AS). Purpose To compare the performances of intravoxel incoherent motion (IVIM)-derived parameters and the apparent diffusion coefficient (ADC) for distinguishing AS-activity. Material and Methods One hundred patients with AS were divided into active (n = 51) and non-active groups (n = 49) and 21 healthy volunteers were included as control. Read More

    Radiographic temporal subtraction analysis can detect finger joint space narrowing progression in rheumatoid arthritis with clinical low disease activity.
    Acta Radiol 2017 Jan 1:284185117721262. Epub 2017 Jan 1.
    4 Hokkaido Medical Center for Rheumatic Diseases, Sapporo, Japan.
    Background Recent papers suggest that finger joints with positive synovial vascularity (SV) assessed by ultrasonography under clinical low disease activity (CLDA) in rheumatoid arthritis (RA) patients may cause joint space narrowing (JSN) progression. Purpose To investigate the performance of a computer-based method by directly comparing with the conventional scoring method in terms of the detectability of JSN progression in hand radiography of RA patients with CLDA. Material and Methods Fifteen RA patients (13 women, 2 men) with long-term sustained CLDA of >2 years were included. Read More

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