14,053 results match your criteria American Journal Of Neuroradiology[Journal]


Surgical Ligation of Spinal CSF-Venous Fistulas after Transvenous Embolization in Patients with Spontaneous Intracranial Hypotension.

AJNR Am J Neuroradiol 2022 Jun 23. Epub 2022 Jun 23.

Imaging (M.M.M.), Cedars-Sinai Medical Center, Los Angeles, California.

A spinal CSF-venous fistula is an increasingly recognized type of CSF leak that causes spontaneous intracranial hypotension. The detection of these fistulas requires specialized imaging such as digital subtraction myelography or dynamic CT myelography, and several treatment options are available. A novel treatment for these CSF-venous fistulas consisting of transvenous embolization with the liquid embolic agent Onyx has been described recently, but some patients require further treatment if embolization fails. Read More

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Quantitative Collateral Assessment on CTP in the Prediction of Stroke Etiology.

AJNR Am J Neuroradiol 2022 Jun 23. Epub 2022 Jun 23.

From the Departments of Neurology (F.S., X.G., W.Z., Z.C., S,Y., M.L.)

Background And Purpose: Patients with stroke etiology of large-artery atherosclerosis were thought to have better collateral circulation compared with patients with other stroke etiologies. We aimed to investigate the association between stroke etiology and collateral circulation with a new quantitative collateral assessment method.

Materials And Methods: This retrospective study reviewed data from consecutive patients with proximal anterior artery occlusion who underwent CTP before reperfusion therapy. Read More

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Flow Diversion for ICA Aneurysms with Compressive Neuro-Ophthalmologic Symptoms: Predictors of Morbidity, Mortality, and Incomplete Aneurysm Occlusion.

AJNR Am J Neuroradiol 2022 Jun 23. Epub 2022 Jun 23.

From the Institute of Neuroradiology (D.P.O.K., M.G.), University Hospital Carl Gustav Carus, Dresden, Germany

Background And Purpose: Flow diversion is an effective treatment for aneurysms of the ICA with compression-related neuro-ophthalmologic symptoms, especially when treatment is initiated early after symptom onset and aneurysm occlusion is complete. However, non-negligible complication rates have been reported. Our aim was to identify risk factors for morbidity/mortality and incomplete aneurysm occlusion. Read More

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Do We Need Gadolinium-Based Contrast Agents for Routine MRI Surveillance of Unoperated Pituitary Macroadenoma?

AJNR Am J Neuroradiol 2022 Jun 23. Epub 2022 Jun 23.

Division of Neuroradiology (P.J.M.), Department of Medical Imaging, University of Toronto, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada.

Background And Purpose: The use of gadolinium-based contrast agents contributes to the cost of MR imaging and prolongs image-acquisition time. There are also recent concerns regarding gadolinium deposition, particularly in patients who require frequent follow-up MRIs. The purpose of this study was to assess whether gadolinium-based contrast agents are needed during MR imaging follow-up for unoperated pituitary macroadenoma. Read More

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Assessment of Heating on Titanium Alloy Cerebral Aneurysm Clips during 7T MRI.

AJNR Am J Neuroradiol 2022 Jun 23. Epub 2022 Jun 23.

From the Department of Neurosurgery (S.T., Y.K., K.S., S.F., K.C., K.O.)

Background And Purpose: Patients with cerebral aneurysms often undergo MR imaging after microsurgical clipping. Ultra-high-field MR imaging at 7T may provide high diagnostic capability in such clinical situations. However, titanium alloy clips have safety issues such as adverse interactions with static magnetic fields and radiofrequency-induced heating during 7T MR imaging. Read More

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Adding MR Diffusion Imaging and T2 Signal Intensity to Neck Imaging Reporting and Data System Categories 2 and 3 in Primary Sites of Postsurgical Oral Cavity Carcinoma Provides Incremental Diagnostic Value.

AJNR Am J Neuroradiol 2022 Jun 23. Epub 2022 Jun 23.

Surgical Oncology (G.M., V.Y., A.D.).

Background And Purpose: The NI-RADS lexicon doesn't use ADC parameters and T2 weighted signal for ascribing categories. We explored ADC, DWI, and T2WI to examine the diagnostic accuracy in primary sites of postsurgical oral cavity carcinoma in the Neck Imaging Reporting and Data System (NI-RADS) categories 2 and 3.

Materials And Methods: We performed a retrospective analysis in clinically asymptomatic post-surgically treated patients with oral cavity squamous cell carcinoma who underwent contrast-enhanced MRI between January 2013 and January 2016. Read More

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Spontaneous Spinal CSF Leaks Stratified by Age, Body Mass Index, and Spinal Level.

AJNR Am J Neuroradiol 2022 Jun 23. Epub 2022 Jun 23.

Department of Neurosurgery (M.F.S.), The Permanente Medical Group, Kaiser Permanente Medical Center, Redwood City, Redwood City, California.

Background And Purpose: There are 3 main types of spinal CSF leaks, and the imaging appearances are well-reported. Specific patient demographics and spinal locations of the various types of spinal leaks are less frequently described. The purpose of this article was to stratify the various types of spontaneous CSF leaks on the basis of age, body mass index, and spinal level. Read More

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The Safety and Efficacy of Flow Diversion versus Conventional Endovascular Treatment for Intracranial Aneurysms: A Meta-analysis of Real-world Cohort Studies from the Past 10 Years.

AJNR Am J Neuroradiol 2022 Jun 16. Epub 2022 Jun 16.

From the Department of Neurosurgery, Xiangya Hospital, Central South University, Changsha, China

Background: Although the flow diverter has advantages in the treatment of intracranial aneurysms, pooled studies that directly compare it with conventional endovascular treatments are rare.

Purpose: Our aim was to compare the safety and efficacy of flow-diverter and conventional endovascular treatments in intracranial aneurysms.

Data Sources: We performed a comprehensive search of the literature using PubMed, EMBASE, and the Cochrane Database. Read More

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Survey of the American Society of Neuroradiology Membership on the Use and Value of Intracranial Vessel Wall MRI.

AJNR Am J Neuroradiol 2022 Jun 16. Epub 2022 Jun 16.

Department of Radiology (Y.Q., B.A.W.), Johns Hopkins University, Baltimore, Maryland.

Background And Purpose: Intracranial vessel wall MR imaging is an emerging technique for intracranial vasculopathy assessment. Our aim was to investigate intracranial vessel wall MR imaging use by the American Society of Neuroradiology (ASNR) members at their home institutions, including indications and barriers to implementation.

Materials And Methods: The ASNR Vessel Wall Imaging Study Group survey on vessel wall MR imaging use, frequency, applications, MR imaging systems and field strength used, protocol development approaches, vendor engagement, reasons for not using vessel wall MR imaging, ordering-provider interest, and impact on clinical care, was distributed to the ASNR membership between April 2 and August 30, 2019. Read More

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The 2021 World Health Organization Classification of Tumors of the Central Nervous System: What Neuroradiologists Need to Know.

AJNR Am J Neuroradiol 2022 Jun 16. Epub 2022 Jun 16.

From the Department of Radiology and Imaging Sciences (A.G.O., K.L.S.), University of Utah School of Medicine, Salt Lake City, Utah

Neuroradiologists play a key role in brain tumor diagnosis and management. Staying current with the latest classification systems and diagnostic markers is important to provide optimal patient care. Publication of the 2016 World Health Organization Classification of Tumors of the Central Nervous System introduced a paradigm shift in the diagnosis of CNS neoplasms. Read More

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RAPID CT Perfusion-Based Relative CBF Identifies Good Collateral Status Better Than Hypoperfusion Intensity Ratio, CBV-Index, and Time-to-Maximum in Anterior Circulation Stroke.

AJNR Am J Neuroradiol 2022 Jun 9. Epub 2022 Jun 9.

From the Department of Neuroradiology (A.P., E.S., C.S.W., U.N., C.H., M.A.M., M.B., F.S.)

Background And Purpose: Information of collateral flow may help to determine eligibility for thrombectomy. Our aim was to identify CT perfusion-based surrogate parameters of good collateral status in acute anterior circulation ischemic stroke.

Materials And Methods: In this retrospective study, we assessed the collateral status of 214 patients who presented with acute ischemic stroke due to occlusion of the MCA M1 segment or the carotid terminus. Read More

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Quantitative MRI in Multiple Sclerosis: From Theory to Application.

AJNR Am J Neuroradiol 2022 Jun 9. Epub 2022 Jun 9.

From the Departments of Advanced Biomedical Sciences (M.T., G. Pontillo, A.B., E.T., S.C.).

Quantitative MR imaging techniques allow evaluating different aspects of brain microstructure, providing meaningful information about the pathophysiology of damage in CNS disorders. In the study of patients with MS, quantitative MR imaging techniques represent an invaluable tool for studying changes in myelin and iron content occurring in the context of inflammatory and neurodegenerative processes. In the first section of this review, we summarize the physics behind quantitative MR imaging, here defined as relaxometry and quantitative susceptibility mapping, and describe the neurobiological correlates of quantitative MR imaging findings. Read More

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Asymmetry Matters: Diffusion Tensor Tractography of the Uncinate Fasciculus in Children with Verbal Memory Deficits.

AJNR Am J Neuroradiol 2022 Jun 9. Epub 2022 Jun 9.

Research on Children with Special Needs Department (N.H.N., A.K., E.R.A.), Medical Research Division, National Research Centre, Cairo, Egypt.

Background And Purpose: Verbal declarative memory performance relies on frontotemporal connectivity. The uncinate fasciculus is a major association tract connecting the frontal and temporal lobes. Hemispheric asymmetries contribute to various cognitive and neurobehavioral abilities. Read More

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Brain Abnormalities and Epilepsy in Patients with Parry-Romberg Syndrome.

AJNR Am J Neuroradiol 2022 06;43(6):850-856

From the Department of Neuroradiology (C.D.l.G.-R., A.J., S.A.M., L.O., R.M., A.A.B., S.J.S., V.G., E.H.M.), Mayo Clinic, Jacksonville, Florida

Background And Purpose: Parry-Romberg syndrome is a rare disorder characterized by progressive hemifacial atrophy. Concomitant brain abnormalities have been reported, frequently resulting in epilepsy, but the frequency and spectrum of brain involvement are not well-established. This study aimed to characterize brain abnormalities in Parry-Romberg syndrome and their association with epilepsy. Read More

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Perspectives.

Authors:
Manfred Hauben

AJNR Am J Neuroradiol 2022 Jun;43(6):791

Pfizer Inc and NYU Langone Health, New York City.

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Differential Subsampling with Cartesian Ordering-MRA for Classifying Residual Treated Aneurysms.

AJNR Am J Neuroradiol 2022 06;43(6):887-892

From the Department of Radiological Sciences (P.S., A.C., K.N.), University of California Los Angeles, Los Angeles, California

Background And Purpose: Differential Subsampling with Cartesian Ordering (DISCO), an ultrafast high-spatial-resolution head MRA, has been introduced. We aimed to determine the diagnostic performance of DISCO-MRA in grading residual aneurysm in comparison with TOF-MRA in patients with treated intracranial aneurysms.

Materials And Methods: Patients with endovascular treatment and having undergone DISCO-MRA, TOF-MRA, and DSA were included for review. Read More

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Comparison of the Utility of High-Resolution CT-DWI and T2WI-DWI Fusion Images for the Localization of Cholesteatoma.

Authors:
X Fan C Ding Z Liu

AJNR Am J Neuroradiol 2022 Jun 2. Epub 2022 Jun 2.

From the Department of Radiology, Shengjing Hospital of China Medical University, Shenyang, China

Background And Purpose: Cholesteatoma is an aggressive disease that may lead to hearing impairment. This study aimed to compare the utility of high-resolution CT and TSE-DWI fusion images with that of T2WI and TSE-DWI fusion images in the localization of middle ear cholesteatoma.

Materials And Methods: Seventy-one patients with middle ear cholesteatoma were retrospectively recruited. Read More

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Brain Injury in Fetuses with Vein of Galen Malformation and Nongalenic Arteriovenous Fistulas: Static Snapshot or a Portent of More?

AJNR Am J Neuroradiol 2022 Jun 2. Epub 2022 Jun 2.

From the Department of Radiology (C.J., F.M.-R., M.A.B., E.Y., D.B.O.), Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts.

Background And Purpose: Brain injury in fetuses with vein of Galen malformations and nongalenic AVFs is a rare complication whose appearance, course, and prognosis are poorly studied. We sought to characterize the MR imaging features and examine associations with postnatal outcome.

Materials And Methods: This was a retrospective analysis of fetal MRIs of subjects with vein of Galen malformation and nongalenic arteriovenous fistulas. Read More

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Navigating Supply Chain Disruptions of Iodinated Contrast Agent for Neuroimaging and How Business Intelligence Can Help the Decision Process.

AJNR Am J Neuroradiol 2022 Jun 1. Epub 2022 Jun 1.

From Monash Imaging, Monash Health, Clayton, Victoria, Australia; and Department of Radiology, Monash University, Clayton, Victoria, Australia.

A recent coronavirus disease 2019-related shutdown of the main production facility of iohexol in China has led to massive shortages of iodinated contrast material across the globe. This shortage has also jeopardized neuroimaging. In this article, we describe remedies to reduce iodinated contrast material use for stroke imaging, which is its primary use in neuroimaging, that we have implemented in our hospital network. Read More

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Volumetric Measurement of Relative CBV Using T1-Perfusion-Weighted MRI with High Temporal Resolution Compared with Traditional T2*-Perfusion-Weighted MRI in Postoperative Patients with High-Grade Gliomas.

AJNR Am J Neuroradiol 2022 06 26;43(6):864-871. Epub 2022 May 26.

From the Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, the Catholic University of Korea, Seoul, Republic of Korea.

Background And Purpose: T1-PWI with high temporal resolution may provide a reliable relative CBV value as a valid alternative to T2*-PWI under increased susceptibility. The purpose of this study was to assess the technical and clinical performance of T1-relative CBV in patients with postoperative high-grade gliomas.

Materials And Methods: Forty-five MRIs of 34 patients with proved high-grade gliomas were included. Read More

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Radiologic Evaluation Criteria for Chronic Subdural Hematomas: Recommendations for Clinical Trials.

AJNR Am J Neuroradiol 2022 May 26. Epub 2022 May 26.

From the Department of Diagnostic and Interventional Neuroradiolog (R.M., M.B., J.F., U.Z., S.G.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany

Embolization of the middle meningeal artery has gained substantial interest as a therapy for chronic subdural hematomas. For the results of the currently running chronic subdural hematoma trials to inform clinical practice, sufficient accuracy and matching definitions are necessary. We summarized the current practice in chronic subdural hematoma evaluation and derived suggestions on reporting standards using the {Nested} Knowledge AutoLit living review platform. Read More

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Perfusion Scotoma: A Potential Core Underestimation in CT Perfusion in the Delayed Time Window in Patients with Acute Ischemic Stroke.

Authors:
K Abrams G Dabus

AJNR Am J Neuroradiol 2022 06 26;43(6):813-816. Epub 2022 May 26.

Department of Neuroendovascular Surgery (G.D.), Miami Cardiac and Vascular Institute, Miami Neuroscience Institute, Miami, Florida.

With the growing rise in utilization of CT perfusion for selecting patients for thrombectomy in acute ischemic stroke from large vessel occlusion, some potential pitfalls are becoming more commonly seen particularly when it comes to estimating the core infarct size on CT perfusion. Ghost infarct core has been described to account for overestimating core infarct size in the early time period (<3 hours). Herein, we describe the phenomenon of underestimating core infarct size on CT perfusion in the later time period (>6 hours), which we have termed perfusion scotoma. Read More

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Microinfarcts in the Deep Gray Matter on 7T MRI: Risk Factors, MRI Correlates, and Relation to Cognitive Functioning-The SMART-MR Study.

AJNR Am J Neuroradiol 2022 06 26;43(6):829-836. Epub 2022 May 26.

Julius Center for Health Sciences and Primary Care (R.G., I.R., M.I.G.), University Medical Center Utrecht and Utrecht University, Utrecht, the Netherlands

Background And Purpose: The clinical relevance of cortical microinfarcts has recently been established; however, studies on microinfarcts in the deep gray matter are lacking. We examined the risk factors and MR imaging correlates of microinfarcts in the deep gray matter on 7T MR imaging and their relation to cognitive functioning.

Materials And Methods: Within the Second Manifestations of ARTerial disease-Magnetic Resonance (SMART-MR) study, 213 patients (mean age, 68 [SD, 8] years) had a risk-factor assessment, 7T and 1. Read More

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Application of 7T MRS to High-Grade Gliomas.

AJNR Am J Neuroradiol 2022 May 26. Epub 2022 May 26.

From the Department of Neurosurgery (L.M., C.G.H.), Icahn School of Medicine at Mount Sinai, Mount Sinai Health System, New York, New York.

MRS, including single-voxel spectroscopy and MR spectroscopic imaging, captures metabolites in high-grade gliomas. Emerging evidence indicates that 7T MRS may be more sensitive to aberrant metabolic activity than lower-field strength MRS. However, the literature on the use of 7T MRS to visualize high-grade gliomas has not been summarized. Read More

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Usefulness of Wave-CAIPI for Postcontrast 3D T1-SPACE in the Evaluation of Brain Metastases.

AJNR Am J Neuroradiol 2022 06 26;43(6):857-863. Epub 2022 May 26.

Department of Neurology (S.-I.O.), Inje University Busan Paik Hospital, Busan, Republic of Korea.

Background And Purpose: High-resolution postcontrast 3D T1WI is a widely used sequence for evaluating brain metastasis, despite the long scan time. This study aimed to compare highly accelerated postcontrast 3D T1-weighted sampling perfection with application-optimized contrasts by using different flip angle evolution by using wave-controlled aliasing in parallel imaging (wave-T1-SPACE) with the commonly used standard high-resolution postcontrast 3D T1-SPACE for the evaluation of brain metastases.

Materials And Methods: Among the 387 patients who underwent postcontrast wave-T1-SPACE and standard SPACE, 56 patients with suspected brain metastases were retrospectively included. Read More

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Diagnostic Accuracy of High-Resolution 3D T2-SPACE in Detecting Cerebral Venous Sinus Thrombosis.

AJNR Am J Neuroradiol 2022 06 26;43(6):881-886. Epub 2022 May 26.

From the University Institute of Diagnostic and Interventional Neuroradiology (A.H., C.K., K.P., M.E.), Bern University Hospital, Inselspital, Inselspital, University of Bern, Bern, Switzerland.

Background And Purpose: Assessment of cerebral venous sinus thrombosis on MR imaging can be challenging. The aim of this study was to evaluate the diagnostic accuracy of high-resolution 3D T2 sampling perfection with application-optimized contrasts by using different flip angle evolution (SPACE) in patients with cerebral venous sinus thrombosis and to compare its performance with contrast-enhanced 3D T1-MPRAGE.

Materials And Methods: We performed a blinded retrospective analysis of T2-SPACE and contrast-enhanced MPRAGE sequences from patients with cerebral venous sinus thrombosis and a control group. Read More

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Nonlesional Sources of Contrast Enhancement on Postgadolinium "Black-Blood" 3D T1-SPACE Images in Patients with Multiple Sclerosis.

AJNR Am J Neuroradiol 2022 06 26;43(6):872-880. Epub 2022 May 26.

Form the Department of Neuroradiology (L.D., E. Prodi, A.C., E. Pravatà), Neurocenter of Southern Switzerland, Ente Ospedaliero Cantonale, Lugano, Switzerland

Background And Purpose: We hypothesized that 3D T1-TSE "black-blood" images may carry an increased risk of contrast-enhancing lesion misdiagnosis in patients with MS because of the misinterpretation of intraparenchymal vein enhancement. Thus, the occurrence of true-positive and false-positive findings was compared between standard MPRAGE and volumetric interpolated brain examination techniques.

Materials And Methods: Sampling perfection with application-optimized contrasts by using different flip-angle evolution (SPACE) images obtained from 232 patients with MS, clinically isolated syndrome, or radiologically isolated syndrome were compared with standard MPRAGE and volumetric interpolated brain examination images. Read More

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Image-Quality Assessment of 3D Intracranial Vessel Wall MRI Using DANTE or DANTE-CAIPI for Blood Suppression and Imaging Acceleration.

AJNR Am J Neuroradiol 2022 06 26;43(6):837-843. Epub 2022 May 26.

Department of Radiology (C.Z., M.M.-B.), University of Washington, Seattle, Washington

Background And Purpose: 3D intracranial vessel wall MRI techniques are time consuming and prone to artifacts, especially flow artifacts. Our aim was to compare the image quality of accelerated and flow-suppressed 3D intracranial vessel wall MR imaging techniques relative to conventional acquisitions.

Materials And Methods: Consecutive patients undergoing MR imaging had conventional postcontrast 3D T1-sampling perfection with application-optimized contrasts by using different flip angle evolution (SPACE) and either postcontrast delay alternating with nutation for tailored excitation (DANTE) flow-suppressed or DANTE-controlled aliasing in parallel imaging results in higher acceleration (CAIPI) flow-suppressed and accelerated T1-SPACE sequences performed. Read More

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Diffusion-Weighted Imaging to Assess HPV-Positive versus HPV-Negative Oropharyngeal Squamous Cell Carcinoma: The Importance of b-Values.

AJNR Am J Neuroradiol 2022 06 26;43(6):905-912. Epub 2022 May 26.

From the Division of Radiology (V.L., B.M.D., Y.M., T.d.P., M.B.), Diagnostic Department, Geneva University Hospitals, University of Geneva, Geneva, Switzerland

Background And Purpose: Controversy exists as to whether ADC histograms are capable to distinguish human papillomavirus-positive (HPV+) from human papillomavirus-negative (HPV-) oropharyngeal squamous cell carcinoma. We investigated how the choice of b-values influences the capability of ADC histograms to distinguish between the two tumor types.

Materials And Methods: Thirty-four consecutive patients with histologically proved primary oropharyngeal squamous cell carcinoma (11 HPV+ and 23 HPV-) underwent 3T MR imaging with a single-shot EPI DWI sequence with 6 b-values (0, 50, 100, 500, 750, 1000 s/mm). Read More

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Investigating Brain White Matter in Football Players with and without Concussion Using a Biophysical Model from Multishell Diffusion MRI.

AJNR Am J Neuroradiol 2022 06 19;43(6):823-828. Epub 2022 May 19.

From the Department of Radiology (S.C., Y.W.L.), Center for Advanced Imaging Innovation and Research, New York University Grossman School of Medicine, New York, New York.

Background And Purpose: There have been growing concerns around potential risks related to sports-related concussion and contact sport exposure to repetitive head impacts in young athletes. Here we investigate WM microstructural differences between collegiate football players with and without sports-related concussion.

Materials And Methods: The study included 78 collegiate athletes (24 football players with sports-related concussion, 26 football players with repetitive head impacts, and 28 non-contact-sport control athletes), available through the Federal Interagency Traumatic Brain Injury Research registry. Read More

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