16,779 results match your criteria projection radiography

Subtraction iodine imaging with area detector CT to improve tumor delineation and measurability of tumor size and depth of invasion in tongue squamous cell carcinoma.

Jpn J Radiol 2021 Sep 16. Epub 2021 Sep 16.

Department of Diagnostic Radiology, National Cancer Center Hospital East, 6-5-1, Kashiwanoha, Kashiwa, Chiba, 277-8577, Japan.

Purpose: Tumor size and depth of invasion (DOI) are mandatory assessments for tumor classification in tongue cancer but are often non-assessable on CT due to dental artifacts. This study investigated whether subtraction iodine imaging (SII) would improve tumor delineation and measurability.

Materials And Methods: Fifty-seven consecutive patients with tongue cancer, who underwent scanning with a 320-row area detector CT with contrast administration and were treated with surgical resection, were retrospectively evaluated. Read More

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September 2021

An Integrated Radiomics Model Incorporating Diffusion-Weighted Imaging and F-FDG PET Imaging Improves the Performance of Differentiating Glioblastoma From Solitary Brain Metastases.

Front Oncol 2021 30;11:732704. Epub 2021 Aug 30.

Department of Radiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.

Background: The effectiveness of conventional MRI (cMRI)-based radiomics in differentiating glioblastoma (GBM) from solitary brain metastases (SBM) is not satisfactory enough. Therefore, we aimed to develop an integrated radiomics model to improve the performance of differentiating GBM from SBM.

Methods: One hundred patients with solitary brain tumors (50 with GBM, 50 with SBM) were retrospectively enrolled and randomly assigned to the training set ( = 80) or validation set ( = 20). Read More

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Local diagnostic reference levels for routine chest X-ray examinations at a public sector hospital in central South Africa.

Health SA 2021 17;26:1622. Epub 2021 Aug 17.

Department of Clinical Sciences, Faculty of Health and Environmental Sciences, Central University of Technology, Bloemfontein, South Africa.

Background: Dose optimisation is a radiation protection guideline recommended by the International Commission on Radiological Protection (ICRP) for adherence to the 'as low as reasonably achievable' (ALARA) principle. Diagnostic reference levels (DRLs) are used to optimise patients' radiation protection for diagnostic and interventional procedures and are particularly useful for frequently performed examinations such as chest X-rays.

Aim: To establish the local diagnostic reference levels (LDRLs) for routine chest X-rays. Read More

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Ultra short time to Echo (UTE) MRI for cephalometric analysis-Potential of an x-ray free fast cephalometric projection technique.

PLoS One 2021 13;16(9):e0257224. Epub 2021 Sep 13.

Dental office, Traben-Trarbach, Germany.

Objectives: A novel magnetic resonance imaging (MRI) scan protocol is presented on the basis of ultra-short time to echo (UTE). By this MRI cephalometric projections (MCPs) can be acquired without the need of post processing in one shot. Different technical parameterizations of the protocol are performed. Read More

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September 2021

Proposed framework for forecasting heat-effects on motor-cognitive performance in the Summer Olympics.

Temperature (Austin) 2021 20;8(3):262-283. Epub 2021 Aug 20.

Department of Nutrition, Exercise and Sports, Section for Integrative Physiology, University of Copenhagen, Copenhagen N, Copenhagen, Denmark.

Heat strain impairs performance across a broad spectrum of sport disciplines. The impeding effects of hyperthermia and dehydration are often ascribed to compromised cardiovascular and muscular functioning, but expert performance also depends on appropriately tuned sensory, motor and cognitive processes. Considering that hyperthermia has implications for central nervous system (CNS) function and fatigue, it is highly relevant to analyze how heat stress forecasted for the upcoming Olympics may influence athletes. Read More

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Rapid diagnosis and continuous monitoring of intracerebral hemorrhage with magnetic induction tomography based on stacked autoencoder.

Rev Sci Instrum 2021 Aug;92(8):084707

School of Life Sciences, Tiangong University, 399 Binshui West Street, Xiqing District, Tianjin 300387, People's Republic of China.

Magnetic induction tomography (MIT) is a promising approach in rapid diagnosis and continuous monitoring of cerebral hemorrhage. A new algorithm for the reconstruction of intracerebral hemorrhage with MIT, including the location and volume of hemorrhage, is proposed in this study. First, 2D magnetic resonance imaging and computed tomography images of patients with cerebral hemorrhage were used for the development of simulation models. Read More

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Imaging diagnosis of canine hip dysplasia with and without human exposure to ionizing radiation.

Vet J 2021 Aug 28;276:105745. Epub 2021 Aug 28.

CITAB - Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal; CECAV - Veterinary and Animal Research Centre, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal; Department of Veterinary Science, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal. Electronic address:

Hip dysplasia (HD) is one of the most common hereditary orthopaedic diseases in dogs, with serious implications for the quality of life of the affected animals. Radiographic screening is essential for the selection of breeding stock in some at-risk breeds, and radiography is also used in the diagnosis of clinical HD cases. A definitive diagnosis of HD is based on radiographic examination, and the most commonly used view is the ventrodorsal hip extended projection, sometimes in combination with various hip stress-based techniques. Read More

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Comparative assessment of the state of bone resorption in patients with chronic generalized periodontitis according to orthopantomogram and cone-beam computed tomography.

Pol Merkur Lekarski 2021 Aug;49(292):286-289

Uzhhorod National University, Uzhhorod, Ukraine.

Aim: The aim of the study was to assess bone resorption in patients with chronic generalized periodontitis according to orthopantomogram (OP) and cone-beam computed tomography (CBCT) and substantiate which of these methods is the most appropriate for use.

Materials And Methods: In order to compare the objectivity of the results of examining the periodontal bone tissue by the above methods (panoramic radiography and computed tomography), we analyzed 26 panoramic radiographs and computed tomograms of the same patients, performed on a PICASSO (3D) computed tomograph by «Vatech».

Results: Comparison of CBCT and OP data in patients with periodontal tissue disease showed a significant difference between the indicators of bone tissue resorption in the mesiodistal direction, and revealed that the volumetric image is significantly objective X-ray picture in periodontal diseases by identifying the state (resorption) of the vestibular and oral cortical plates in any section dentition. Read More

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A Rare Case of Traumatic Thyroid Gland Hypoperfusion/Devascularization After a Gunshot Wound Through the Neck: Computed Tomography Findings.

Am J Case Rep 2021 Aug 30;22:e930505. Epub 2021 Aug 30.

Department of Diagnostic Radiology, University of Puerto Rico, San Juan, Puerto Rico.

BACKGROUND The thyroid gland is rarely injured in cases of penetrating neck trauma. Computed tomography (CT) plays a central role in prompt evaluation of the extent of penetrating neck trauma and can demonstrate thyroid gland injury. The current literature on thyroid gland injury is limited mostly to blunt trauma, with little emphasis on findings seen on CT imaging. Read More

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Quantification of the Immune Content in Neuroblastoma: Deep Learning and Topological Data Analysis in Digital Pathology.

Int J Mol Sci 2021 Aug 16;22(16). Epub 2021 Aug 16.

Data Science for Health, Fondazione Bruno Kessler, 38123 Trento, Italy.

We introduce here a novel machine learning (ML) framework to address the issue of the quantitative assessment of the immune content in neuroblastoma (NB) specimens. First, the EUNet, a U-Net with an EfficientNet encoder, is trained to detect lymphocytes on tissue digital slides stained with the CD3 T-cell marker. The training set consists of 3782 images extracted from an original collection of 54 whole slide images (WSIs), manually annotated for a total of 73,751 lymphocytes. Read More

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Dual-energy CT in differentiating benign sinonasal lesions from malignant ones: comparison with simulated single-energy CT, conventional MRI, and DWI.

Eur Radiol 2021 Aug 24. Epub 2021 Aug 24.

The Shanghai Institution of Medical Imaging, Zhongshan Hospital, Fudan University, Shanghai, 200032, People's Republic of China.

Objectives: To explore the value of dual-energy CT (DECT) for differentiating benign sinonasal lesions from malignant ones, and to compare this finding with simulated single-energy CT (SECT), conventional MRI (cMRI), and diffusion-weighted imaging (DWI).

Methods: Patients with sinonasal lesions (38 benign and 34 malignant) who were confirmed by histopathology underwent DECT, cMRI, and DWI. DECT-derived parameters (iodine concentration (IC), effective atomic number (Eff-Z), 40-180 keV (20-keV interval), virtual non-enhancement (VNC), slope (k), and linear-mixed 0. Read More

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[Central Slice Theorem-based Relationship between 1D-NPS Obtained by the Slit Method and 2D-NPS for CT Images].

Nihon Hoshasen Gijutsu Gakkai Zasshi 2021 ;77(8):828-832

Division of Radiology, Niigata University Medical and Dental Hospital.

Purpose: The method using a numerical slit (slit method) is used commonly to obtain the one-dimensional (1D) noise power spectrum (NPS) in computed tomography. However, the relationship between the 1D-NPS obtained by the slit method and the original two-dimensional (2D) NPS derived by the 2D Fourier transformation has not been elucidated clearly. The purpose of this study was to clarify their relationship based on the well-known central slice theorem (projection slice theorem) and validate it using computer simulation analysis. Read More

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Use of Digital Tomosynthesis in Assessing Accurate Medial Epicondyle Fracture Displacement as Compared With Conventional Radiography and Computed Tomography.

J Pediatr Orthop 2021 Aug 23. Epub 2021 Aug 23.

Department of Orthopaedic Surgery, UCSF Benioff Children's Hospital Department of Radiology, UCSF Medical Center Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA Department of Pediatric Radiology, Doernbecher Children's Hospital at OHSU, Portland, OR.

Introduction: Medial epicondyle fracture displacement is notoriously difficult to determine on conventional radiography, and follow-up computed tomography (CT) is often obtained to measure precise displacement. Another option for fracture characterization is digital tomosynthesis (DT), a technology providing high in-plane resolution of bony anatomy by acquiring multiple low-dose images in a linear arc. Advantages of DT include lower radiation exposure and lower cost than CT, rapid image acquisition, and a similar patient experience to conventional radiography. Read More

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The Safety of Operating on Breasts With a History of Prior Reduction Mammoplasty: Dynamic Magnetic Resonance Imaging Analysis of Angiogenesis.

Aesthet Surg J 2021 Aug 20. Epub 2021 Aug 20.

Department of Plastic and Reconstructive Surgery, Seoul National University College of Medicine and Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, South Korea.

Background: Vascularity of the nipple-areolar complex (NAC) is altered after reduction mammoplasty, which increases complications risks after repeat reduction or nipple-sparing mastectomy.

Objectives: To evaluate angiogenesis of the NAC via serial analysis of breast magnetic resonance images (MRIs).

Methods: Breast MRIs after reduction mammoplasty were analyzed for 35 patients (39 breasts) using three-dimensional reconstructions of maximal intensity projection images. Read More

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Lung perfusion changes in COVID-19 pneumonia: a dual energy computerized tomography study.

Br J Radiol 2021 Sep;94(1125):20201380

Department of Radiology, Atatürk University, Erzurum, Turkey.

Objective: There is limited and contradictory information about pulmonary perfusion changes detected with dual energy computed tomography (DECT) in COVID-19 cases. The purpose of this study was to define lung perfusion changes in COVID-19 cases with DECT, as well as to reveal any possible links between perfusion changes and laboratory findings.

Methods: Patients who had a positive RT-PCR for SARS-CoV-2 and a contrast-enhanced chest DECT examination were included in the study. Read More

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September 2021

Soft robotic manipulator for intraoperative MRI-guided transoral laser microsurgery.

Sci Robot 2021 Aug;6(57)

Department of Mechanical Engineering, University of Hong Kong, Hong Kong, China.

Magnetic resonance (MR) imaging (MRI) provides compelling features for the guidance of interventional procedures, including high-contrast soft tissue imaging, detailed visualization of physiological changes, and thermometry. Laser-based tumor ablation stands to benefit greatly from MRI guidance because 3D resection margins alongside thermal distributions can be evaluated in real time to protect critical structures while ensuring adequate resection margins. However, few studies have investigated the use of projection-based lasers like those for transoral laser microsurgery, potentially because dexterous laser steering is required at the ablation site, raising substantial challenges in the confined MRI bore and its strong magnetic field. Read More

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Evaluation of the Foot Arch in Partial Weightbearing Conditions.

Foot Ankle Int 2021 Aug 17:10711007211034804. Epub 2021 Aug 17.

RR&D Center for Limb Loss and MoBility, (CLiMB), VA Puget Sound Health Care System, Seattle, WA, USA.

Background: Weightbearing plain radiography or computed tomography (CT) is used for diagnosis or treatment selection in foot disorders. This study compared foot alignment between full weightbearing (50% body weight [BW] per foot) plain radiography and nonweightbearing (0% BW) or partial weightbearing (10% BW per foot) CT scans.

Methods: Subjects had both full (50% BW per foot) weightbearing plain radiographs and either a nonweightbearing (0% BW) or a partial weightbearing (20% BW or 10% BW per foot) CT scan. Read More

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Professionals' responses to the introduction of AI innovations in radiology and their implications for future adoption: a qualitative study.

BMC Health Serv Res 2021 Aug 14;21(1):813. Epub 2021 Aug 14.

Centre for Healthcare Innovation Research, City, University of London, London, UK.

Background: Artificial Intelligence (AI) innovations in radiology offer a potential solution to the increasing demand for imaging tests and the ongoing workforce crisis. Crucial to their adoption is the involvement of different professional groups, namely radiologists and radiographers, who work interdependently but whose perceptions and responses towards AI may differ. We aim to explore the knowledge, awareness and attitudes towards AI amongst professional groups in radiology, and to analyse the implications for the future adoption of these technologies into practice. Read More

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Dopaminergic Dysregulation in Syndromic Autism Spectrum Disorders: Insights From Genetic Mouse Models.

Front Neural Circuits 2021 23;15:700968. Epub 2021 Jul 23.

Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, United States.

Autism spectrum disorder (ASD) is a neurodevelopmental disorder defined by altered social interaction and communication, and repetitive, restricted, inflexible behaviors. Approximately 1.5-2% of the general population meet the diagnostic criteria for ASD and several brain regions including the cortex, amygdala, cerebellum and basal ganglia have been implicated in ASD pathophysiology. Read More

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[Cephalometric analysis of lateral skull X-ray images using soft computing components in the search for key points].

Stomatologiia (Mosk) 2021 ;100(4):63-67

National University of Science and Technology MISIS, Moscow, Russia.

The Aim Of The Study: Was to investigate the efficiency of decoding teleradiological studies using an algorithm based on the use of convolutional neural networks - a simple convolutional architecture, as well as an extended U-Net architecture.

Materials And Methods: For the experiment, a dataset was prepared by three orthodontists with over 10 years of clinical experience. Each of the orthodontists processed 100 X-ray images of the lateral projection of the head according to 27 parameters, 2700 measurements were made. Read More

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[Consistency of expert opinions on localization of the reference points for studying a soft tissue face profile in digital teleradiological images of the skull lateral projection].

Stomatologiia (Mosk) 2021 ;100(4):49-54

Samara Federal Research Scientific Center RAS, Samara, Russia.

Objective: The aim of the study is to identify the consistency of expert opinions when manually identifying the reference points positions for studying the soft-tissue face profile in digital teleradiological images of the skull lateral projection.

Material And Methods: The study involved 11 orthodontists having a 1 to 8 year experience. They localized the reference points manually, using the software with image enhancement options. Read More

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Influence of the use of various imaging units and projections on the radiation dose received by children during chest digital radiography.

PLoS One 2021 5;16(8):e0255749. Epub 2021 Aug 5.

Department of Radiology, Children's Hospital of Chongqing Medical University, Chongqing, China.

Objective: To investigate the impact of the use of different imaging units and projections on radiation dose and image quality during chest digital radiography (DR) in 3- and 4-year-old children.

Methods: Two hundred forty 3- and 4-year-old participants requiring chest DR were included; they were divided into three groups: supine anterior-posterior projection (APP), standing APP and standing posterior-anterior projection (PAP). Each group included 40 participants who were evaluated using the same imaging unit. Read More

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Three-dimensional characterizations of two-photon excitation fluorescence images of elastic fibers affected by cutaneous scar duration.

Quant Imaging Med Surg 2021 Aug;11(8):3584-3594

Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, Fujian Normal University, Fuzhou, China.

Background: The type or duration of a scar determines the choice of therapy available. Traditional detection methods can easily cause secondary trauma, so there is an urgent need for a non-invasive, rapid diagnostic approach.

Methods: A strategy for quantitative analysis of three-dimensional (3D) elastic fibers in human cutaneous scars was designed, which included 3D reconstruction, skeleton extraction, quantitative analysis, and random forest regression. Read More

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Low monoenergetic DECT detection of pyelonephritis extent.

Eur J Radiol 2021 Sep 8;142:109837. Epub 2021 Jul 8.

Department of Radiology, Hadassah Medical Center, Hebrew University of Jerusalem, The Faculty of Medicine, Jerusalem 91120, Israel. Electronic address:

Objectives: To determine whether contrast enhanced DECT low monoenergetic can improve diagnostic conspicuity of inflamed kidney foci in acute pyelonephritis compared to conventional images.

Materials And Methods: A retrospective study of 45 patients with clinical signs of acute pyelonephritis undergoing contrast-enhanced exams on a single source-DECT was conducted. Representative conventional and monoenergetic images were randomized and presented to four abdominal radiologists to determine their preference for inflamed kidney foci detection, and to determine the number of foci identified. Read More

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September 2021

Sodium Intensity Changes Differ Between Relaxation- and Density-Weighted MRI in Multiple Sclerosis.

Front Neurol 2021 14;12:693447. Epub 2021 Jul 14.

Department of Biomedical Engineering, University of Alberta, Edmonton, AB, Canada.

The source of Tissue Sodium Concentration (TSC) increase in Multiple Sclerosis (MS) remains unclear, and could be attributed to altered intracellular sodium concentration or tissue microstructure. This paper investigates sodium in MS using three new MRI sequences. Three sodium scans were acquired at 4. Read More

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Positron emission tomography/computed tomography hypermetabolism of Kikuchi-Fujimoto disease mimicking malignant lymphoma: a case report and literature review.

J Int Med Res 2021 Jul;49(7):3000605211032859

Department of Nuclear Medicine, 159407The First Hospital of China Medical University, The First Hospital of China Medical University, Shenyang, P.R. China.

Kikuchi-Fujimoto disease (KFD), also known as histiocytic necrotizing lymphadenitis, is a benign, self-limiting inflammatory disorder of unknown etiology and pathogenesis. This report presents a rare case involving a man with F-fluorodeoxyglucose positron emission tomography/computed tomography (FDG PET/CT) hypermetabolism caused by KFD mimicking malignant lymphoma. The PET/CT maximum intensity projection showed multiple hypermetabolic lymphadenopathies and homogeneous FDG uptake in the bone marrow and spleen. Read More

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A novel use for routine CBCT imaging during radiotherapy to detect COVID-19.

Radiography (Lond) 2021 Jul 23. Epub 2021 Jul 23.

The Christie NHSFT, Manchester, United Kingdom; Division of Cancer Sciences, Faculty of Biology, Medicine and Health, The University of Manchester, Manchester, United Kingdom.

Introduction: Thoracic CT is a useful tool in the early diagnosis of patients with COVID-19. Typical appearances include patchy ground glass shadowing. Thoracic radiotherapy uses daily cone beam CT imaging (CBCT) to check for changes in patient positioning and anatomy prior to treatment through a qualitative assessment of lung appearance by radiographers. Read More

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A 3D deep learning model to predict the diagnosis of dementia with Lewy bodies, Alzheimer's disease, and mild cognitive impairment using brain 18F-FDG PET.

Eur J Nucl Med Mol Imaging 2021 Jul 30. Epub 2021 Jul 30.

Department of Clinical Physiology, Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden.

Purpose: The purpose of this study is to develop and validate a 3D deep learning model that predicts the final clinical diagnosis of Alzheimer's disease (AD), dementia with Lewy bodies (DLB), mild cognitive impairment due to Alzheimer's disease (MCI-AD), and cognitively normal (CN) using fluorine 18 fluorodeoxyglucose PET (18F-FDG PET) and compare model's performance to that of multiple expert nuclear medicine physicians' readers.

Materials And Methods: Retrospective 18F-FDG PET scans for AD, MCI-AD, and CN were collected from Alzheimer's disease neuroimaging initiative (556 patients from 2005 to 2020), and CN and DLB cases were from European DLB Consortium (201 patients from 2005 to 2018). The introduced 3D convolutional neural network was trained using 90% of the data and externally tested using 10% as well as comparison to human readers on the same independent test set. Read More

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[Radiological aspects in the diagnostics of pathological fractures].

Unfallchirurg 2021 Sep 29;124(9):695-703. Epub 2021 Jul 29.

Klinik für Unfallchirurgie, Medizinische Hochschule Hannover, Hannover, Deutschland.

Radiological diagnostics play a key role in the identification and assessment of pathological fractures. Conventional projection radiography is still the mainstay of imaging investigations. With knowledge of the patient history, the morphology and location of a fracture as well as concomitant findings, such as osteolysis or periosteal reactions can add valuable information on the origin of the fracture. Read More

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September 2021

Chiropractic students' experiences on the use of virtual radiography simulation: a pilot observational study.

BMC Med Educ 2021 Jul 28;21(1):404. Epub 2021 Jul 28.

School of Health and Biomedical Sciences, RMIT University, Melbourne, Australia.

Background: Virtual radiography provides students with an opportunity to practise their clinical skills in patient positioning and evaluating radiographic images. The purpose of this pilot study was to introduce Projection VR™, a software radiography simulation program, into a student chiropractic program and evaluate its potential application as a teaching and learning tool.

Methods: Undergraduate chiropractic students, enrolled in a radiographic course (unit within the chiropractic program), were invited to attend a scheduled laboratory where they were introduced to, and undertook purposefully designed activities using the radiography simulation. Read More

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