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Susceptibility Weighted Imaging

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https://www.readbyqxmd.com/read/28346006/magnetic-resonance-imaging-susceptibility-artifacts-in-the-cervical-vertebrae-and-spinal-cord-related-to-monocortical-screw-polymethylmethacrylate-implants-in-canine-cadavers
#1
Brian G Jones, Geoffrey T Fosgate, Eric M Green, Amy M Habing, Bianca F Hettlich
OBJECTIVE To characterize and compare MRI susceptibility artifacts related to titanium and stainless steel monocortical screws in the cervical vertebrae and spinal cord of canine cadavers. SAMPLE 12 canine cadavers. PROCEDURES Cervical vertebrae (C4 and C5) were surgically stabilized with titanium or stainless steel monocortical screws and polymethylmethacrylate. Routine T1-weighted, T2-weighted, and short tau inversion recovery sequences were performed at 3.0 T. Magnetic susceptibility artifacts in 20 regions of interest (ROIs) across 4 contiguous vertebrae (C3 through C6) were scored by use of an established scoring system...
April 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28343216/susceptibility-weighted-imaging-identifies-iron-oxide-labeled-human-neural-stem-cells-automated-computational-detection
#2
Mohsen Baghchechi, Amy Plaia, Mary Hamer, Nirmalya Ghosh, Stephen Ashwal, Andre Obenaus
Neonatal hypoxic-ischemic brain injury (HII) can lead to devastating neurological outcomes such as cerebral palsy, epilepsy, and mental retardation. Human neural stem cell (hNSC) therapy provides new hope for the treatment of neonatal HII. These multipotent cells can aid in HII recovery by activating multiple reparative mechanisms including secretion of neurotrophic factors that enhance brain repair and plasticity. For clinical use of implanted hNSCs, methods are required to identify, quantify, track, and visualize migration and replication in an automated and reproducible fashion...
March 25, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28336816/glomerular-density-and-volume-in-renal-biopsy-specimens-of-children-with-proteinuria-relative-to-preterm-birth-and-gestational-age
#3
Kentaro Koike, Yohei Ikezumi, Nobuo Tsuboi, Go Kanzaki, Kotaro Haruhara, Yusuke Okabayashi, Takaya Sasaki, Makoto Ogura, Akihiko Saitoh, Takashi Yokoo
BACKGROUND AND OBJECTIVES: A low total nephron number, which is associated with low birth weight (LBW), may indicate increased susceptibility to early-onset renal diseases in children. However, few studies have assessed renal biopsy findings in LBW children. We examined the relationship between LBW and glomerular density (GD) and/or glomerular volume (GV) in renal biopsy samples as a surrogate for total nephron number. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: Renal biopsy findings of children of LBW were compared with those of age-matched control subjects of normal birth weight (NBW) who were histopathologically diagnosed with FSGS or minimal change nephrotic syndrome (MCNS) from 1995 to 2011...
March 23, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/28331948/erratum-to-diagnostic-imaging-of-dementia-with-lewy-bodies-by-susceptibility-weighted-imaging-of-nigrosomes-versus-striatal-dopamine-transporter-single-photon-emission-computed-tomography-a-retrospective-observational-study
#4
Koji Kamagata, Tomoya Nakatsuka, Ryuji Sakakibara, Yohei Tsuyusaki, Tomohiro Takamura, Kanako Sato, Michimasa Suzuki, Masaaki Hori, Kanako K Kumamaru, Tsutomu Inaoka, Shigeki Aoki, Hitoshi Terada
No abstract text is available yet for this article.
March 22, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28330684/mri-for-the-detection-of-calcific-features-of-vertebral-haemangioma
#5
Y Y Bender, S M Böker, G Diederichs, T Walter, M Wagner, E Fallenberg, T Liebig, M Rickert, B Hamm, M R Makowski
AIM: To evaluate the diagnostic performance of susceptibility-weighted-magnetic-resonance imaging (SW-MRI) for the detection of vertebral haemangiomas (VHs) compared to T1/T2-weighted MRI sequences, radiographs, and computed tomography (CT). MATERIALS AND METHODS: The study was approved by the local ethics review board. An SW-MRI sequence was added to the clinical spine imaging protocol. The image-based diagnosis of 56 VHs in 46 patients was established using T1/T2 MRI in combination with radiography/CT as the reference standard...
March 19, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28327941/degree-of-vascular-encasement-in-sphenoid-wing-meningiomas-predicts-postoperative-ischemic-complications
#6
D Jay McCracken, Raymond A Higginbotham, Jason H Boulter, Yuan Liu, John A Wells, Sameer H Halani, Amit M Saindane, Nelson M Oyesiku, Daniel L Barrow, Jeffrey J Olson
BACKGROUND: Sphenoid wing meningiomas (SWMs) can encase arteries of the circle of Willis, increasing their susceptibility to intraoperative vascular injury and severe ischemic complications. OBJECTIVE: To demonstrate the effect of circumferential vascular encasement in SWM on postoperative ischemia. METHODS: A retrospective review of 75 patients surgically treated for SWM from 2009 to 2015 was undertaken to determine the degree of circumferential vascular encasement (0°-360°) as assessed by preoperative magnetic resonance imaging (MRI)...
January 28, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28326034/the-presence-of-previous-cerebral-microbleeds-has-a-negative-effect-on-hypertensive-intracerebral-hemorrhage-recovery
#7
Kang Yang, Yulan Feng, JinJin Mu, Ningzhen Fu, Shufen Chen, Yi Fu
Background and Purpose: Cerebral microbleeds are an intracerebral microangiopathy with bleeding tendency found in intracerebral hemorrhage patients. However, studies about cerebral microbleed effects on the prognosis of hypertensive intracerebral hemorrhage patients are rare. We performed a prospective study to discuss not only the risk factors of cerebral microbleed incidence in hypertensive intracerebral hemorrhage patients but also the relevance of cerebral microbleeds with silent brain infarction, hemorrhage and prognosis...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28306556/metal-artifact-reduction-in-mri-based-cervical-cancer-intracavitary-brachytherapy
#8
Yuan James Rao, Jacqueline E Zoberi, Mo Kadbi, Perry W Grigsby, Jochen Cammin, Stacie L Mackey, Jose Garcia-Ramirez, S Murty Goddu, Julie K Schwarz, H Michael Gach
Magnetic resonance imaging (MRI) plays an increasingly important role in brachytherapy planning for cervical cancer. Yet, metal tandem, ovoid intracavitary applicators, and fiducial markers used in brachytherapy cause magnetic susceptibility artifacts in standard MRI. These artifacts may impact the accuracy of brachytherapy treatment and the evaluation of tumor response by misrepresenting the size and location of the metal implant, and distorting the surrounding anatomy and tissue. Metal artifact reduction sequences (MARS) with high bandwidth RF selective excitations and turbo spin-echo readouts were developed for MRI of orthopedic implants...
March 17, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28303922/correlation-of-cerebral-microbleed-distribution-to-amyloid-burden-in-patients-with-primary-intracerebral-hemorrhage
#9
Hsin-Hsi Tsai, Li-Kai Tsai, Ya-Fang Chen, Sung-Chun Tang, Bo-Ching Lee, Ruoh-Fang Yen, Jiann-Shing Jeng
The underlying pathology of cerebral microbleeds (CMBs) with mixed lobar and deep distribution remains contentious. The aim of this study was to correlate CMBs distribution to β-amyloid burden in patients with primary intracerebral hemorrhage (ICH). Fourty-seven ICH patients underwent magnetic resonance susceptibility-weighted imaging and (11)C-Pittsburgh Compound B positron emission tomography. The amyloid burden was expressed as standardized uptake value ratio with reference to cerebellum, and presented as median (interquartile range)...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303376/parkinson-s-disease-diagnostic-utility-of-volumetric-imaging
#10
Wei-Che Lin, Kun-Hsien Chou, Pei-Lin Lee, Nai-Wen Tsai, Hsiu-Ling Chen, Ai-Ling Hsu, Meng-Hsiang Chen, Yung-Cheng Huang, Ching-Po Lin, Cheng-Hsien Lu
PURPOSE: This paper aims to examine the effectiveness of structural imaging as an aid in the diagnosis of Parkinson's disease (PD). METHODS: High-resolution T 1-weighted magnetic resonance imaging was performed in 72 patients with idiopathic PD (mean age, 61.08 years) and 73 healthy subjects (mean age, 58.96 years). The whole brain was parcellated into 95 regions of interest using composite anatomical atlases, and region volumes were calculated. Three diagnostic classifiers were constructed using binary multiple logistic regression modeling: the (i) basal ganglion prior classifier, (ii) data-driven classifier, and (iii) basal ganglion prior/data-driven hybrid classifier...
March 16, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28302608/ipsilateral-prominent-thalamostriate-vein-on-susceptibility-weighted-imaging-predicts-poor-outcome-after-intravenous-thrombolysis-in-acute-ischemic-stroke
#11
X Zhang, S Zhang, Q Chen, W Ding, B C V Campbell, M Lou
BACKGROUND AND PURPOSE: The impact of deep cerebral veins on neurologic outcome after intravenous thrombolysis in patients with acute ischemic stroke is unclear. We investigated the relationship between the appearance of deep cerebral veins on susceptibility-weighted imaging and neurologic outcome in patients who underwent thrombolysis. MATERIALS AND METHODS: We retrospectively analyzed 109 consecutive patients with acute ischemic stroke who had pretreatment SWI and received intravenous thrombolysis within 6 hours...
March 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28301491/the-performance-of-mr-perfusion-weighted-imaging-for-the-differentiation-of-high-grade-glioma-from-primary-central-nervous-system-lymphoma-a-systematic-review-and-meta-analysis
#12
Weilin Xu, Qun Wang, Anwen Shao, Bainan Xu, Jianmin Zhang
It is always a great challenge to distinguish high-grade glioma (HGG) from primary central nervous system lymphoma (PCNSL). We conducted a meta-analysis to assess the performance of MR perfusion-weighted imaging (PWI) in differentiating HGG from PCNSL. The heterogeneity and threshold effect were evaluated, and the sensitivity (SEN), specificity (SPE) and areas under summary receiver operating characteristic curve (SROC) were calculated. Fourteen studies with a total of 598 participants were included in this meta-analysis...
2017: PloS One
https://www.readbyqxmd.com/read/28294063/cerebral-microbleeds-do-not-predict-hemorrhagic-transformation-in-acute-ischemic-stroke-patients-with-atrial-fibrillation-and-or-rheumatic-heart-disease
#13
Junfeng Liu, Deren Wang, Jie Li, Jing Lin, Yao Xiong, Bian Liu, Chenchen Wei, Bo Wu, Zhenxing Ma, Shihong Zhang, Ming Liu
Background and Purpose Cerebral microbleeds (CMBs) are known to be potential risk factors for intracerebral hemorrhage (ICH), but there is controversy on the relationship between CMBs and hemorrhagic transformation (HT) after ischemic stroke. Besides, the question regarding whether the relationship between CMBs and HT can be affected by antithrombotic drugs in acute stage of ischemic stroke has not yet reached a consensus. Methods 174 acute ischemic stroke patients with atrial fibrillation (AF) and/or rheumatic heart disease (RHD) were prospectively and consecutively enrolled in the study, of which 160 patients (mean 68...
March 13, 2017: Current Neurovascular Research
https://www.readbyqxmd.com/read/28290939/susceptibility-weighted-imaging-and-white-matter-abnormality-findings-in-service-members-with-persistent-cognitive-symptoms-following-mild-traumatic-brain-injury
#14
David F Tate, Maria Gusman, Jonathan Kini, Matthew Reid, Carmen S Velez, Ann Marie Drennon, Douglas B Cooper, Jan E Kennedy, Amy O Bowles, Erin D Bigler, Jeffrey D Lewis, John Ritter, Gerald E York
Mild traumatic brain injury (mTBI) is a major health concern among active duty service members and Veterans returning from combat operations, and it can result in variable clinical and cognitive outcomes. Identifying biomarkers that can improve diagnosis and prognostication has been at the forefront of recent research efforts. The purpose of this study was to compare the sensitivity and specificity of abnormalities identified using more traditional magnetic resonance imaging (MRI) sequences such as fluid attenuation inversion recovery (FLAIR) to more advanced MRI sequences such as susceptibility weighted imaging (SWI) among a cohort of active duty service members experiencing persistent cognitive symptoms after mTBI...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28279984/performance-assessment-for-brain-mr-imaging-registration-methods
#15
J S Lin, D T Fuentes, A Chandler, S S Prabhu, J S Weinberg, V Baladandayuthapani, J D Hazle, D Schellingerhout
BACKGROUND AND PURPOSE: Clinical brain MR imaging registration algorithms are often made available by commercial vendors without figures of merit. The purpose of this study was to suggest a rational performance comparison methodology for these products. MATERIALS AND METHODS: Twenty patients were imaged on clinical 3T scanners by using 4 sequences: T2-weighted, FLAIR, susceptibility-weighted angiography, and T1 postcontrast. Fiducial landmark sites (n = 1175) were specified throughout these image volumes to define identical anatomic locations across sequences...
March 9, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28278291/diagnostic-accuracy-of-susceptibility-weighted-magnetic-resonance-imaging-for-the-evaluation-of-pineal-gland-calcification
#16
Lisa C Adams, Sarah M Böker, Yvonne Y Bender, Gerd Diederichs, Eva M Fallenberg, Moritz Wagner, Bernd Hamm, Marcus R Makowski
OBJECTIVES: To determine the diagnostic performance of susceptibility-weighted magnetic resonance imaging (SWMR) for the detection of pineal gland calcifications (PGC) compared to conventional magnetic resonance imaging (MRI) sequences, using computed tomography (CT) as a reference standard. METHODS: 384 patients who received a 1.5 Tesla MRI scan including SWMR sequences and a CT scan of the brain between January 2014 and October 2016 were retrospectively evaluated...
2017: PloS One
https://www.readbyqxmd.com/read/28271216/the-imaging-appearance-of-crayons
#17
Aaron S McAllister, Neil U Lall, Kareem O Tawfik, Blaise V Jones
BACKGROUND: A crayon fragment was determined to be the source of a foreign body inflammatory process in the masticator space of a 15-month-old boy. The appearance of the crayon on CT and MR imaging was unexpected, leading to a further analysis of the imaging features of crayons. OBJECTIVE: To investigate and characterize the imaging appearance of crayons at CT and MRI. MATERIALS AND METHODS: The authors obtained CT and MR images of 22 crayons from three manufacturers and three non-pigmented crayons cast by the authors...
March 7, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28270324/-imaging-methods-used-in-the-differential-diagnosis-between-brain-tumour-relapse-and-radiation-necrosis-after-stereotactic-radiosurgery-of-brain-metastases-literature-review
#18
I Menoux, J-P Armspach, G Noël, D Antoni
After stereotactic radiosurgery for a cerebral metastasis, one of the dreaded toxicities is radionecrosis. In the follow-up of these patients, it is impossible to distinguish radiation necrosis from tumour relapse either clinically or with MRI. In current practice, many imaging methods are designed such as special sequences of MRI (dynamic susceptibility contrast perfusion and susceptibility-weighted imaging, diffusion), proton magnetic resonance spectroscopy, positron emission tomography, or more seldom 201-thallium single-photon emission computerized tomography...
December 2016: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
https://www.readbyqxmd.com/read/28269776/amyloid-related-imaging-abnormalities-in%C3%A2-an-aged-squirrel-monkey-with-cerebral-amyloid-angiopathy
#19
Eric Heuer, Jessica Jacobs, Rebecca Du, Silun Wang, Orion P Keifer, Amarallys F Cintron, Jeromy Dooyema, Yuguang Meng, Xiaodong Zhang, Lary C Walker
Amyloid-related imaging abnormalities (ARIA) in magnetic resonance imaging scans have emerged as indicators of potentially serious side effects in clinical trials of therapeutics for Alzheimer's disease. These anomalies include an edematous type (ARIA-E) that appears as hyperintense (bright) regions by T2-weighted MRI, and a type characterized by the deposition of hemosiderin (ARIA-H) that elicits a hypointense signal, especially in T2* susceptibility weighted images. ARIA in general has been linked to the presence of amyloid-β (Aβ)-type cerebral amyloid angiopathy, an accumulation of misfolded Aβ protein in the vascular wall that impairs the integrity of brain blood vessels...
2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28263417/methods-for-the-computation-of-templates-from-quantitative-magnetic-susceptibility-maps-qsm-toward-improved-atlas-and-voxel-based-analyses-vba
#20
Jannis Hanspach, Michael G Dwyer, Niels P Bergsland, Xiang Feng, Jesper Hagemeier, Nicola Bertolino, Paul Polak, Jürgen R Reichenbach, Robert Zivadinov, Ferdinand Schweser
PURPOSE: To develop and assess a method for the creation of templates for voxel-based analysis (VBA) and atlas-based approaches using quantitative magnetic susceptibility mapping (QSM). MATERIALS AND METHODS: We studied four strategies for the creation of magnetic susceptibility brain templates, derived as successive extensions of the conventional template generation (CONV) based on only T1 -weighted (T1 w) images. One method that used only T1 w images involved a minor improvement of CONV (U-CONV)...
March 6, 2017: Journal of Magnetic Resonance Imaging: JMRI
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