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Journals Topics in Magnetic Resonance I...

Topics in Magnetic Resonance Imaging : TMRI

https://read.qxmd.com/read/36648166/from-mild-gait-difficulties-to-a-sudden-coma-a-rare-case-of-marchiafava-bignami-disease
#1
JOURNAL ARTICLE
Henri De Ryck, Sofie Van Cauter, Kim Bekelaar
In this case report we describe the case of a 66-year old man with subacute gait difficulties, with a progression to confusion coma with multiple generalised epileptic seizures during the following days. Biochemical analysis showed hyperglycaemia, cerebrospinal fluid (CSF) testing showed a mild lymphocytic pleocytosis and an elevated protein and lactate. Broad-spectrum antibiotics and antiviral therapy where initiated. However, all other CSF testing remained negative. Magnetic resonance imaging of the brain showed remarkably symmetric hyperintense T2 white matter lesions most noticable in the corpus callosum...
January 11, 2023: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/36735623/phantom-less-nonlinear-magnetic-resonance-imaging-calibration-with-multiple-input-blood-flow-model
#2
JOURNAL ARTICLE
Tomoki Saka, Toshiyuki Gotoh, Seiichiro Kagei, Tae Iwasawa, Rogerio Y Takimoto, Marcos S G Tsuzuki
PURPOSE: Previous work used phantoms to calibrate the nonlinear relationship between the gadolinium contrast concentration and the intensity of the magnetic resonance imaging signal. This work proposes a new nonlinear calibration procedure without phantoms and considers the variation of contrast agent mass minimum combined with the multiple input blood flow system. This also proposes a new single-input method with meaningful variables that is not influenced by reperfusion or noise generated by aliasing...
February 1, 2023: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/36469640/7t-small-animal-mri-research-for-hepatic-alveolar-echinococcosis
#3
JOURNAL ARTICLE
Guanmi Zhang, Yalin Mou, Haining Fan, Weixia Li, Yuntai Cao, Haihua Bao
OBJECTIVES: 7T small animal magnetic resonance imaging (MRI) was used to analyze the growth characteristics of hepatic alveolar echinococcosis (HAE). METHODS: A mouse model of HAE was established by intraperitoneal injection of alveolar Echinococcus tissue suspension. Ten mouse models successfully inoculated by ultrasound screening were selected. The mouse model was scanned with T1-weighted imaging (T1WI), T2-weighted imaging (T2WI), and diffusion-weighted imaging (DWI) sequence by 7T small animal MRI...
December 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/36378902/bilateral-ovarian-endometriomas-a-case-report
#4
JOURNAL ARTICLE
Antonia M Pausch, Olivio F Donati, Andreas M Hötker
No abstract text is available yet for this article.
November 10, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/36305817/postmortem-diffusion-weighted-magnetic-resonance-imaging-of-the-brain-in-perinatal-death-an-animal-control-study-to-detect-the-influence-of-postmortem-interval
#5
JOURNAL ARTICLE
Maud P M Tijssen, Simon G F Robben, Willemijn M Klein, Paul A M Hofman
OBJECTIVES: Diffusion-weighted imaging may be useful as part of a postmortem magnetic resonance imaging protocol. However, apart from the effect of temperature on apparent diffusion coefficient (ADC), normal postmortem ADC changes can influence the interpretation. Therefore, this study was conducted to evaluate the correlation between normal ADC changes and postmortem intervals (PMIs) and develop a reference standard for postmortem changes after temperature correction. MATERIALS AND METHODS: Six premature lambs were scanned at different PMIs...
October 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/36122324/the-utility-of-vessel-wall-imaging-in-the-postulation-of-acute-ischemic-stroke-with-spontaneous-recanalization-pathophysiology
#6
JOURNAL ARTICLE
Mohamad Syafeeq Faeez Md Noh, Anna Misyail Abdul Rashid, Fan Kee Hoo, Norafida Bahari
Recent advances in technology, particularly in the field of magnetic resonance imaging, have brought forth new sequences, including vessel wall imaging (VWI). Traditionally, the workup for intracranial vascular pathology has always turned to luminal imaging using computed tomography angiography, magnetic resonance angiography, or digital subtraction angiography. Since its introduction, VWI has enabled researchers and practicing clinicians to better understand disease processes and manage patients to the best standard of care possible...
August 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/35767314/logistic-regression-based-model-is-more-efficient-than-u-net-model-for-reliable-whole-brain-magnetic-resonance-imaging-segmentation
#7
JOURNAL ARTICLE
Henry Dieckhaus, Rozanna Meijboom, Serhat Okar, Tianxia Wu, Prasanna Parvathaneni, Yair Mina, Siddharthan Chandran, Adam D Waldman, Daniel S Reich, Govind Nair
OBJECTIVES: Automated whole brain segmentation from magnetic resonance images is of great interest for the development of clinically relevant volumetric markers for various neurological diseases. Although deep learning methods have demonstrated remarkable potential in this area, they may perform poorly in nonoptimal conditions, such as limited training data availability. Manual whole brain segmentation is an incredibly tedious process, so minimizing the data set size required for training segmentation algorithms may be of wide interest...
June 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/36269228/postmortem-fetal-temperature-estimation-with-magnetic-resonance-imaging-apparent-diffusion-coefficient-measurements-in-the-vitreous-body-and-cerebrospinal-fluid
#8
JOURNAL ARTICLE
Maud P M Tijssen, Paul A M Hofman, Simon G F Robben
OBJECTIVES: Magnetic resonance imaging (MRI) is increasingly used in postmortem fetal imaging. Several factors influence the quality of MRI in this setting, such as small size, autolytic and maceration changes, and temperature. Knowing the fetal temperature at the time of scanning can improve the MRI interpretation. Temperature can be calculated using diffusion-weighted imaging with measurements of the apparent diffusion coefficient (ADC) in the cerebrospinal fluid (CSF). However, this is complicated by small ventricle size and hemorrhage and, therefore, may be unreliable in postmortem imaging...
April 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/35225842/congenital-zika-syndrome-the-main-cause-of-death-and-correspondence-between-brain-ct-and-postmortem-histological-section-findings
#9
JOURNAL ARTICLE
(no author information available yet)
No abstract text is available yet for this article.
February 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/35225841/update-imaging-findings-of-congenital-zika-syndrome-a-disease-story-that-is-still-being-written
#10
JOURNAL ARTICLE
(no author information available yet)
No abstract text is available yet for this article.
February 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/35225840/magnetic-resonance-elastography-in-intracranial-neoplasms-a-scoping-review
#11
REVIEW
Jan Saip Aunan-Diop, Bo Halle, Christian Bonde Pedersen, Ulla Jensen, Sune Munthe, Frederik Harbo, Mikkel Schou Andersen, Frantz Rom Poulsen
BACKGROUND: Magnetic resonance elastography (MRE) allows noninvasive assessment of intracranial tumor mechanics and may thus be predictive of intraoperative conditions. Variations in the use of technical terms complicate reading of current literature, and there is need of a review using consolidated nomenclature. OBJECTIVES: We present an overview of current literature on MRE relating to human intracranial neoplasms using standardized nomenclature suggested by the MRE guidelines committee...
February 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/35225839/visualization-of-concurrent-epicardial-and-microvascular-coronary-artery-disease-in-a-patient-with-systemic-lupus-erythematosus-by-magnetic-resonance-imaging
#12
JOURNAL ARTICLE
Liam McGill, Callum Gill, U Joseph Schoepf, Richard R Bayer, Pal Suranyi, Akos Varga-Szemes
We present a patient with history of systemic lupus erythematosus who presented with acute chest pain. Electrocardiography, invasive coronary angiography, and cardiac MRI were performed during the course of her evaluation. Invasive coronary angiography demonstrated obstructive disease in the diagonal system and cardiovascular MRI confirmed an anterior infarct consistent with the electrocardiographic findings. However, MRI also revealed focal inferoseptal hypoperfusion inconsistent with electrocardiographic and angiographic findings...
February 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/35225838/afternoon-thoughts-about-a-new-beginning-the-value-of-mri-and-the-need-for-curiosity
#13
JOURNAL ARTICLE
Tilman Emrich
No abstract text is available yet for this article.
February 1, 2022: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/34613948/a-web-based-system-to-assist-with-etiology-differential-diagnosis-in-children-with-arterial-ischemic-stroke
#14
JOURNAL ARTICLE
Anjini Karthik, Bin Jiang, Ying Li, Nancy K Hills, Maria Kuchherzki, Gabrielle A deVeber, A James Barkovich, Heather J Fullerton, Max Wintermark
BACKGROUND AND PURPOSE: The diagnosis of childhood arteriopathy is complex. We present a Web-based, evidence-backed classification system to return the most likely cause(s) of a pediatric arterial ischemic stroke. This tool incorporates a decision-making algorithm that considers a patient's clinical and imaging features before returning a differential diagnosis, including the likelihood of various arteriopathy subtypes. METHODS: The Vascular Effects of Infection in Pediatric Stroke study prospectively enrolled 355 children with arterial ischemic stroke (2010-2014)...
October 1, 2021: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/34613947/cerebral-perfusion-in-pediatric-stroke-children-are-not-little-adults
#15
REVIEW
Sarah Lee, Bin Jiang, Jeremy J Heit, Robert L Dodd, Max Wintermark
Cerebral perfusion imaging provides useful information about the hemodynamic state of the brain that is relevant to a number of neurologic conditions, including stroke, epilepsy, and brain tumors. Multiple imaging modalities have been developed to evaluate brain perfusion, primarily by the use of different tracers to measure cerebral blood volume and cerebral blood flow. Here, we provide an overview of magnetic resonance imaging perfusion techniques; summarize the role of perfusion imaging in adult stroke; describe changes in cerebral blood flow over childhood; and discuss the relevance and future directions of perfusion imaging in pediatric cerebrovascular disorders and stroke...
October 1, 2021: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/34613946/reperfusion-therapies-for-children-with-arterial-ischemic-stroke
#16
REVIEW
Jeremy J Heit, Prakash Muthusami, Ronil V Chandra, Ferdinand Hui, Matias Negrotto, Sarah Lee, Bruce A Wasserman, Todd A Abruzzo
Modern hyperacute reperfusion therapies including intravenous thrombolysis and mechanical thrombectomy have transformed the management of arterial ischemic stroke (AIS) in adults. Multiple randomized clinical trials have demonstrated that these therapies enable remarkable improvements in clinical outcome for properly selected patients with AIS. Because pediatric patients were excluded from predicate clinical trials, there is a conspicuous lack of data to guide selection of therapies and inform age-adjusted and pathology-oriented treatment modifications for children...
October 1, 2021: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/34613945/definitive-diagnostic-evaluation-of-the-child-with-arterial-ischemic-stroke-and-approaches-to-secondary-stroke-prevention
#17
JOURNAL ARTICLE
Sarah Lee, Prakash Muthusami, Bruce M Wasserman, Jeremy J Heit, Ronil V Chandra, Ferdinand Hui, Matias Negrotto, Todd A Abruzzo
In children with arterial ischemic stroke (AIS), the definitive diagnosis of stroke subtype and confirmation of stroke etiology is necessary to mitigate stroke morbidity and prevent recurrent stroke. The common causes of AIS in children are sharply differentiated from the common causes of adult AIS. A comprehensive, structured diagnostic approach will identify the etiology of stroke in most children. Adequate diagnostic evaluation relies on advanced brain imaging and vascular imaging studies. A variety of medical and surgical secondary stroke prevention strategies directed at the underlying cause of stroke are available...
October 1, 2021: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/34613944/initial-diagnostic-evaluation-of-the-child-with-suspected-arterial-ischemic-stroke
#18
JOURNAL ARTICLE
Matias Negrotto, Prakash Muthusami, Bruce M Wasserman, Sarah Lee, Jeremy J Heit, Ronil V Chandra, Ferdinand Hui, Todd A Abruzzo
Numerous factors make the initial diagnostic evaluation of children with suspected arterial ischemic stroke (AIS) a relatively unsettling challenge, even for the experienced stroke specialist. The low frequency of pediatric AIS, diversity of unique age-oriented stroke phenotypes, and unconventional approaches required for diagnosis and treatment all contribute difficulty to the process. This review aims to outline important features that differentiate pediatric AIS from adult AIS and provide practical strategies that will assist the stroke specialist with diagnostic decision making in the initial phase of care...
October 1, 2021: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/34397970/cerebral-perfusion-imaging-for-intravenous-thrombolysis-treatment
#19
JOURNAL ARTICLE
Diana E Slawski Md, Gregory W Albers Md
Intravenous thrombolysis is the cornerstone of acute ischemic stroke treatment. However, the benefits of recanalization and reperfusion must be balanced against the risk of intracranial hemorrhage. Time from symptom onset was previously the most important selection tool for identifying patients who would benefit from treatment without prohibitive risk for secondary hemorrhage. Enhanced techniques in noncontrast computed tomography followed by computed tomography and magnetic resonance perfusion imaging led to the expansion of treatment eligibility for intravenous thrombolysis...
August 1, 2021: Topics in Magnetic Resonance Imaging: TMRI
https://read.qxmd.com/read/34397969/mr-perfusion-in-the-evaluation-of-mechanical-thrombectomy-candidacy
#20
REVIEW
Varsha Muddasani, Adam de Havenon, J Scott McNally, Hediyeh Baradaran, Matthew D Alexander
Stroke is a leading cause of disability and mortality, and the incidence of ischemic stroke is projected to continue to rise in coming decades. These projections emphasize the need for improved imaging techniques for accurate diagnosis allowing effective treatments for ischemic stroke. Ischemic stroke is commonly evaluated with computed tomography (CT) or magnetic resonance imaging (MRI). Noncontrast CT is typically used within 4.5 hours of symptom onset to identify candidates for thrombolysis. Beyond this time window, thrombolytic therapy may lead to poor outcomes if patients are not optimally selected using appropriate imaging...
August 1, 2021: Topics in Magnetic Resonance Imaging: TMRI
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