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Susceptibility Weighted Imaging

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https://www.readbyqxmd.com/read/28634507/susceptibility-weighted-imaging-diagnosis-of-cerebral-fat-embolism
#1
Joseph D Burns, Daniel Noujaim, Brian J Scott
No abstract text is available yet for this article.
July 2017: Neurohospitalist
https://www.readbyqxmd.com/read/28627983/susceptibility-weighted-imaging-a-problem-solving-tool-in-differentiation-of-cerebellopontine-angle-schwannomas-and-meningiomas
#2
Atul Mishra, Bejoy Thomas, T R Kapilamoorthy
Background and purpose Vestibular schwannomas and meningiomas of the cerebellopontine angle can be differentiated by the presence of foci of blooming on susceptibility weighted imaging. Materials and methods In this retrospective study, magnetic resonance imaging with susceptibility weighted imaging sequence in addition to other routine sequences was done in 73 patients. All the cases were studied for the presence of foci of blooming within the tumor on susceptibility weighted imaging. Histopathological examination confirmed the diagnosis in all cases...
June 2017: Neuroradiology Journal
https://www.readbyqxmd.com/read/28620965/determination-of-retinal-surface-area
#3
Manbir Nagra, Bernard Gilmartin, Ngoc Jade Thai, Nicola S Logan
Previous attempts at determining retinal surface area and surface area of the whole eye have been based upon mathematical calculations derived from retinal photographs, schematic eyes and retinal biopsies of donor eyes. 3-dimensional (3-D) ocular magnetic resonance imaging (MRI) allows a more direct measurement, it can be used to image the eye in vivo, and there is no risk of tissue shrinkage. The primary purpose of this study is to compare, using T2-weighted 3D MRI, retinal surface areas for superior-temporal (ST), inferior-temporal (IT), superior-nasal (SN) and inferior-nasal (IN) retinal quadrants...
June 16, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28609385/association-between-menopause-and-lumbar-disc-degeneration-an-mri-study-of-1-566-women-and-1-382-men
#4
Chao Lou, Hongliang Chen, Liangwei Mei, Weiyang Yu, Kejun Zhu, Feijun Liu, Zhenzhong Chen, Guangheng Xiang, Minjiang Chen, Qiaoyou Weng, Dengwei He
OBJECTIVE: The aim of this study was to revisit and further investigate the association between menopause and disc degeneration in the lumbar spine using a magnetic resonance imaging-based eight-level grading system. METHODS: This study cohort comprised of 1,566 women and 1,382 age-matched men who were admitted for low back pain from June 2013 to October 2016. Data on age, weight, height, body mass index, age at natural menopause, and years since menopause (YSM) were obtained...
June 12, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/28602813/automated-segmentation-of-midbrain-structures-with-high-iron-content
#5
REVIEW
Benjamín Garzón, Rouslan Sitnikov, Lars Bäckman, Grégoria Kalpouzos
The substantia nigra (SN), the subthalamic nucleus (STN), and the red nucleus (RN) are midbrain structures of ample interest in many neuroimaging studies, which may benefit from the availability of automated segmentation methods. The high iron content of these structures awards them high contrast in quantitative susceptibility mapping (QSM) images. We present a novel segmentation method that leverages the information of these images to produce automated segmentations of the SN, STN, and RN. The algorithm builds a map of spatial priors for the structures by non-linearly registering a set of manually-traced training labels to the midbrain...
June 9, 2017: NeuroImage
https://www.readbyqxmd.com/read/28602499/susceptibility-weighted-angiography-and-diffusion-weighted-imaging-in-posterior-reversible-encephalopathy-syndrome-is-there-an-association-between-hemorrhage-cytotoxic-edema-blood-pressure-and-imaging-severity
#6
Shivaprakash Basavanthaiah Hiremath, Amol Anantrao Gautam, Shilpa Anil, Reji Thomas, Geena Benjamin
PURPOSE: To assess the significance of association and possible correlation between hemorrhage, cytotoxic edema, blood pressure and imaging severity in posterior reversible encephalopathy syndrome (PRES). MATERIALS AND METHODS: This retrospective study included the medical and imaging records of 35 consecutive patients with PRES. The clinical data analysis included the highest recorded blood pressure (BP) on the day of the ictus, MRI including spin-echo echo planar diffusion-weighted imaging (DWI), susceptibility weighted angiography (SWAN) and conventional sequences...
June 8, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28592708/low-signal-intensity-rims-along-the-cerebral-cortex-and-u-fibers-on-susceptibility-weighted-imaging-in-progressive-multifocal-leukoencephalopathy
#7
Yuki Arita, Hirokazu Fujiwara, Jun Kurasawa, Suketaka Momoshima, Tsubasa Takizawa, Masahiro Jinzaki
No abstract text is available yet for this article.
June 8, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28589484/longitudinal-volume-quantification-of-deep-medullary-veins-in-patients-with-cerebral-venous-sinus-thrombosis-venous-volume-assessment-in-cerebral-venous-sinus-thrombosis-using-swi
#8
A K Dempfle, A Harloff, F Schuchardt, J Bäuerle, S Yang, H Urbach, K Egger
PURPOSE: Susceptibility-weighted imaging (SWI) visualizes small cerebral veins with high sensitivity and could, thus, enable quantification of hemodynamics of deep medullary veins. We aimed to evaluate volume changes of deep medullary veins in patients with acute cerebral venous sinus thrombosis (CVST) over time in comparison to healthy controls. METHODS: All magnetic resonance imaging (MRI) experiments were executed at 3 T using a 32-channel head coil. Based on SWI and semiautomatic postprocessing (statistical parametric mapping [SPM8] and ANTs), the volume of deep medullary veins was quantified in 14 patients with acute CVST at baseline and the 6‑month follow-up, as well as in 13 healthy controls undergoing repeated MRI examination with an interscan interval of at least 1 month...
June 6, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28588126/differences-in-subependymal-vein-anatomy-may-predispose-preterm-infants-to-gmh-ivh
#9
Domenico Tortora, Mariasavina Severino, Mariya Malova, Alessandro Parodi, Giovanni Morana, Jan Sedlacik, Paul Govaert, Joseph J Volpe, Andrea Rossi, Luca Antonio Ramenghi
BACKGROUND AND PURPOSE: The anatomy of the deep venous system plays an important role in the pathogenesis of brain lesions in the preterm brain as shown by different histological studies. The aims of this study were to compare the subependymal vein anatomy of preterm neonates with germinal matrix haemorrhage-intraventricular haemorrhage (GMH-IVH), as evaluated by susceptibility-weighted imaging (SWI) venography, with a group of age-matched controls with normal brain MRI, and to explore the relationship between the anatomical features of subependymal veins and clinical risk factors for GMH-IVH...
June 6, 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/28587332/three-dimensional-arterial-spin-labeling-imaging-and-dynamic-susceptibility-contrast-perfusion-weighted-imaging-value-in-diagnosing-glioma-grade-prior-to-surgery
#10
Hong Ma, Zizheng Wang, Kai Xu, Zefeng Shao, Chun Yang, Peng Xu, Xiaohua Liu, Chunfeng Hu, Xin Lu, Yutao Rong
The current study aimed to investigate whole-brain three-dimensional arterial spin labeling imaging (3D ASL) and dynamic susceptibility contrast perfusion-weighted imaging (DSC-PWI), in regards to their diagnostic value of preoperative glioma grade. The parameter values obtained after correction will be correlated with the diagnostic value of 3D ASL and DSC-PWI perfusion. In the current study, 50 patients with gliomas confirmed by pathology were used, including 27 low-grade gliomas (LGGs) and 23 high-grade gliomas (HGGs)...
June 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28585082/magnetic-resonance-imaging-perfusion-is-associated-with-disease-severity-and-activity-in-multiple-sclerosis
#11
Piotr Sowa, Gro Owren Nygaard, Atle Bjørnerud, Elisabeth Gulowsen Celius, Hanne Flinstad Harbo, Mona Kristiansen Beyer
PURPOSE: The utility of perfusion-weighted imaging in multiple sclerosis (MS) is not well investigated. The purpose of this study was to compare baseline normalized perfusion measures in subgroups of newly diagnosed MS patients. We wanted to test the hypothesis that this method can differentiate between groups defined according to disease severity and disease activity at 1 year follow-up. METHODS: Baseline magnetic resonance imaging (MRI) including a dynamic susceptibility contrast perfusion sequence was performed on a 1...
June 5, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28580051/cerebral-misery-perfusion-on-susceptibility-weighted-imaging-in-acute-carotid-dissection
#12
Arian Mashhood, Paggie Kim, Frankis Almaguel, Geoffery McWilliams, J Paul Jacobson
The cerebral vasculature incorporates several fail-safes that must be breached before an irreversible ischemic event takes place. In particular, when autoregulatory vasodilatation fails secondary to falling cerebral perfusion pressure (CPP; stage I hemodynamic failure), increases in the oxygen extraction fraction work to maintain the cerebral metabolic rate of oxygen. Previously, failure of this mechanism, stage II hemodynamic failure, or misery perfusion, has been imaged via positron emission tomography/computed tomography (PET/CT)...
October 2016: Journal of Radiology Case Reports
https://www.readbyqxmd.com/read/28579039/total-mismatch-of-diffusion-weighted-imaging-and-susceptibility-weighted-imaging-in-patients-with-acute-cerebral-ischemia
#13
Min-Gyu Park, Jeong A Yeom, Seung Kug Baik, Kyung-Pil Park
BACKGROUND AND PURPOSE: Multiple hypointense vessels (MHV) on susceptibility-weighted imaging (SWI) is associated with an increased oxygen demand in acute cerebral ischemia. Occasionally, some patients exhibit extensive MHV on SWI despite of negative diffusion-weighted imaging (DWI), which is a phenomenon called total mismatch DWI-SWI. We analyzed the clinical characteristics and imaging findings in patients with the total DWI-SWI mismatch. MATERIALS AND METHODS: We selected patients with total DWI-SWI mismatch who underwent MRI within 12hours from onset...
May 31, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28571703/diagnosis-of-intracranial-calcification-and-hemorrhage-in-pediatric-patients-comparison-of-quantitative-susceptibility-mapping-and-phase-images-of-susceptibility-weighted-imaging
#14
S Ciraci, K Gumus, S Doganay, M S Dundar, G D Kaya Ozcora, S B Gorkem, H Per, A Coskun
PURPOSE: To prospectively compare the diagnostic capabilities of quantitative susceptibility mapping (QSM) with those of phase images of susceptibility-weighted imaging (SWI) in the detection and differentiation of intracranial calcification and hemorrhage in pediatric patients. METHOD: Sixteen pediatric patients (9 girls, 7 boys) with a mean age of 9.4±6.3 (SD) years (range, 6 days-15 years) were included. Fifty-nine calcifications and 31 hemorrhages were detected...
May 29, 2017: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/28565751/application-of-high-field-magnetic-resonance-imaging-in-parkinson-s-disease
#15
Peng-Fei Qiao, Feng Shi, Ming-Fang Jiang, Yang Gao, Guang-Ming Niu
The present study aimed to observe the structural changes of the extracorticospinal tract in Parkinson's disease (PD) using susceptibility-weighted imaging (SWI) and diffusion tensor imaging (DTI) magnetic resonance (MR) scans. The association of DTI parameters and brain-iron accumulation with PD was examined and imaging signs useful in the diagnosis of PD were explored. The study included 30 patients with PD and 30 age- and gender-matched healthy controls who underwent routine MR, SWI and DTI scans. The corrected phase (CP) values of the substantia nigra (SN), red nucleus (RN), globus pallidus (GP) and putamen (PUT) were measured, and fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values were obtained...
May 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28560152/improved-cerebral-microbleeds-detection-using-their-magnetic-signature-on-t2-phase-contrast-a-comparison-study-in-a-clinical-setting
#16
Takoua Kaaouana, Anne Bertrand, Fatma Ouamer, Bruno Law-Ye, Nadya Pyatigorskaya, Ali Bouyahia, Nathalie Thiery, Carole Dufouil, Christine Delmaire, Didier Dormont, Ludovic de Rochefort, Marie Chupin
INTRODUCTION/PURPOSE: In vivo detection of cerebral microbleeds (CMBs) from T2* gradient recalled echo (GRE) magnitude image suffers from low specificity, modest inter-rater reproducibility and is biased by its sensitivity to acquisition parameters. New methods were proposed for improving this identification, but they mostly rely on 3D acquisitions, not always feasible in clinical practice. A fast 2D phase processing technique for computing internal field maps (IFM) has been shown to make it possible to characterize CMBs through their magnetic signature in routine clinical setting, based on 2D multi-slice acquisitions...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28556244/coherence-enhancement-in-quantitative-susceptibility-mapping-by-means-of-anisotropic-weighting-in-morphology-enabled-dipole-inversion
#17
Youngwook Kee, Junghun Cho, Kofi Deh, Zhe Liu, Pascal Spincemaille, Yi Wang
PURPOSE: To investigate an anisotropic structural prior in morphology enabled dipole inversion (MEDI) for improving accuracy in quantitative susceptibility mapping (QSM). THEORY AND METHODS: Anisotropic weighting (AW) was devised and implemented to incorporate orientation information into the edge agreement in the MEDI method. AW performance was compared with isotropic weighting by testing and validating on in vivo brain multiple orientation MRI data using COSMOS and the (33) component of the susceptibility tensor as reference...
May 28, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28555127/cerebral-microbleeds-hypertension-and-intracerebral-hemorrhage-in-cerebral-autosomal-dominant-arteriopathy-with-subcortical-infarcts-and-leukoencephalopathy
#18
Jung Seok Lee, KeunHyuk Ko, Jung-Hwan Oh, Joon Hyuk Park, Ho Kyu Lee, David Floriolli, Annlia Paganini-Hill, Mark Fisher
BACKGROUND: Cerebral autosomal-dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is the most common genetic cause of stroke. In addition to ischemic stroke, CADASIL predisposes to development of cerebral microbleeds (CMB). CMB and hypertension are known to be associated with intracerebral hemorrhage (ICH). The purpose of this study was to analyze the relationships among CMB, hypertension, and ICH in CADASIL. MATERIALS AND METHODS: We enrolled 94 genetically confirmed CADASIL patients from 76 unrelated families at Jeju National University Hospital (Korea) between March 2012 and February 2015...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28552147/radiology-and-imaging-for-cavernous-malformations
#19
Kevin Y Wang, Oluwatoyin R Idowu, Doris D M Lin
Cavernous malformations are low-flow vascular malformations that are histologically characterized by the lack of mural elements of mature vascular structures and intervening parenchymal neural tissue. They are often clinically quiescent, and may grow, bleed, and regress, but can also manifest clinically as neurologic deficits or seizures in the setting of an acute hemorrhage. The low-flow nature of cavernous malformations renders them inherently occult on cerebral angiography. Magnetic resonance imaging has become the mainstay imaging modality in evaluating cavernous malformations, producing characteristic imaging features that usually provide a straightforward diagnosis...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/28549449/fatal-familial-insomnia-with-abnormal-signals-on-routine-mri-a-case-report-and-literature-review
#20
Tingting Lu, Yuhang Pan, Lisheng Peng, Feng Qin, Xiaobo Sun, Zhengqi Lu, Wei Qiu
BACKGROUND: Fatal familial insomnia (FFI) is a rare autosomal dominant disease caused by the PRNP D178N/129 M mutation. Routine brain CT and MRI usually reveal non-specific features. We report a patient with FFI presenting with diffuse abnormal signals on MRI, later confirmed as combined with cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL). CASE PRESENTATION: The patient was a 58-year-old female, whose main clinical manifestations were insomnia, movement disorders, autonomic hyperactivity and mental deterioration...
May 26, 2017: BMC Neurology
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