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Neuroradiology

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https://www.readbyqxmd.com/read/28744730/relationships-between-the-integrity-and-function-of-lumbar-nerve-roots-as-assessed-by-diffusion-tensor-imaging-and-neurophysiology
#1
S Y Chiou, P J Hellyer, D J Sharp, R D Newbould, M C Patel, P H Strutton
PURPOSE: Diffusion tensor imaging (DTI) has shown promise in the measurement of peripheral nerve integrity, although the optimal way to apply the technique for the study of lumbar spinal nerves is unclear. The aims of this study are to use an improved DTI acquisition to investigate lumbar nerve root integrity and correlate this with functional measures using neurophysiology. METHODS: Twenty healthy volunteers underwent 3 T DTI of the L5/S1 area. Regions of interest were applied to L5 and S1 nerve roots, and DTI metrics (fractional anisotropy, mean, axial and radial diffusivity) were derived...
July 25, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28744729/low-angled-microcatheter-approach-for-coil-embolization-of-the-anterior-choroidal-artery-aneurysm
#2
Jae Jon Sheen, Dae Chul Suh
PURPOSE: Thromboembolic complication is a serious concern following coil embolization for aneurysms involving the anterior choroidal artery (AChA). To minimize this complication and to improve packing density, we present a technical concept of coil embolization. METHODS: We attempted packing of the aneurysmal sac by lowering the microcatheter approach angle into an aneurysm to secure AChA origin as well as to improve coil packing density of the aneurysm. This technical concept involves approaching the aneurysm sac with an adjusted shaping of the microcatheter tip to achieve the effect which was not obtained when the microcatheter approach angle into the aneurysm sac was high (≥90°)...
July 25, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28744728/the-non-invasive-search-for-the-carotid-cavernous-fistula-the-added-value-of-the-4d-cta
#3
LETTER
Martinus J van Amerongen, Sjoert A H Pegge, Mustapha El Kandoussi, Hieronymus D Boogaarts, Frederick J A Meijer
No abstract text is available yet for this article.
July 25, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28730268/detection-of-vessel-wall-calcifications-in-vertebral-arteries-using-susceptibility-weighted-imaging
#4
Lisa C Adams, Sarah M Böker, Yvonne Y Bender, Eva M Fallenberg, Moritz Wagner, Thomas Liebig, Bernd Hamm, Marcus R Makowski
PURPOSE: Calcification of the brain supplying arteries has been linked to an increased risk for cerebrovascular disease. The purpose of this study was to test the potential of susceptibility weighted MR imaging (SWMR) for the detection of vertebral artery calcifications, based on CT as a reference standard. METHODS: Four hundred seventy-four patients, who had received head CT and 1.5 T MR scans with SWMR, including the distal vertebral artery, between January 2014 and December 2016, were retrospectively evaluated and 389 patients were included...
July 20, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28730267/phantom-based-standardization-of-ct-angiography-images-for-spot-sign-detection
#5
Andrea Morotti, Javier M Romero, Michael J Jessel, Andrew M Hernandez, Anastasia Vashkevich, Kristin Schwab, Joseph D Burns, Qaisar A Shah, Thomas A Bergman, M Fareed K Suri, Mustapha Ezzeddine, Jawad F Kirmani, Sachin Agarwal, Angela Hays Shapshak, Steven R Messe, Chitra Venkatasubramanian, Katherine Palmieri, Christopher Lewandowski, Tiffany R Chang, Ira Chang, David Z Rose, Wade Smith, Chung Y Hsu, Chun-Lin Liu, Li-Ming Lien, Chen-Yu Hsiao, Toru Iwama, Mohammad Rauf Afzal, Christy Cassarly, Steven M Greenberg, Renee' Hebert Martin, Adnan I Qureshi, Jonathan Rosand, John M Boone, Joshua N Goldstein
PURPOSE: The CT angiography (CTA) spot sign is a strong predictor of hematoma expansion in intracerebral hemorrhage (ICH). However, CTA parameters vary widely across centers and may negatively impact spot sign accuracy in predicting ICH expansion. We developed a CT iodine calibration phantom that was scanned at different institutions in a large multicenter ICH clinical trial to determine the effect of image standardization on spot sign detection and performance. METHODS: A custom phantom containing known concentrations of iodine was designed and scanned using the stroke CT protocol at each institution...
July 20, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28721443/a-diffusion-spectrum-imaging-based-tractographic-study-into-the-anatomical-subdivision-and-cortical-connectivity-of-the-ventral-external-capsule-uncinate-and-inferior-fronto-occipital-fascicles
#6
Sandip S Panesar, Fang-Cheng Yeh, Christopher P Deibert, David Fernandes-Cabral, Vijayakrishna Rowthu, Pinar Celtikci, Emrah Celtikci, William D Hula, Sudhir Pathak, Juan C Fernández-Miranda
PURPOSE: The inferior fronto-occipital fasciculus (IFOF) and uncinate fasciculus (UF) are major fronto-capsular white matter pathways. IFOF connects frontal areas of the brain to parieto-occipital areas. UF connects ventral frontal areas to anterior temporal areas. Both fascicles are thought to subserve higher language and emotion roles. Controversy pertaining to their connectivity and subdivision persists in the literature, however. METHODS: High-definition fiber tractography (HDFT) is a non-tensor tractographic method using diffusion spectrum imaging data...
July 18, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28721442/involvement-of-the-cerebral-veins-in-melas-syndrome
#7
LETTER
Josef Finsterer, Sinda Zarrouk-Mahjoub
No abstract text is available yet for this article.
July 18, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28721441/radiation-dose-to-the-operator-during-fluoroscopically-guided-spine-procedures
#8
Luca Roccatagliata, Stefano Presilla, Emanuele Pravatà, Alessandro Cianfoni
PURPOSE: Fluoroscopy is widely used to guide diagnostic and therapeutic spine procedures. The purpose of this study was to quantify radiation incident on the operator (operator Air Kerma) during a wide range of fluoroscopy-guided spine procedures and its correlation with the amount of radiation incident on the patient (Kerma Area Product-KAP). METHODS: We retrospectively included 57 consecutive fluoroscopically guided spine procedures. KAP [Gy cm(2)] and total fluoroscopy time were recorded for each procedure...
July 18, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28707166/altered-dynamic-functional-connectivity-in-the-default-mode-network-in-patients-with-cirrhosis-and-minimal-hepatic-encephalopathy
#9
Hua-Jun Chen, Hai-Long Lin, Qiu-Feng Chen, Peng-Fei Liu
PURPOSE: Abnormal brain intrinsic functional connectivity (FC) has been documented in minimal hepatic encephalopathy (MHE) by static connectivity analysis. However, changes in dynamic FC (dFC) remain unknown. We aimed to identify altered dFC within the default mode network (DMN) associated with MHE. METHODS: Resting-state functional MRI data were acquired from 20 cirrhotic patients with MHE and 24 healthy controls. DMN seed regions were defined using seed-based FC analysis (centered on the posterior cingulate cortex (PCC))...
July 13, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28689261/investigation-of-cognitive-circuits-using-steady-state-cerebral-blood-volume-and-diffusion-tensor-imaging-in-patients-with-mild-cognitive-impairment-following-electrical-injury
#10
Chang-Hyun Park, Cheong Hoon Seo, Myung Hun Jung, So Young Joo, Soyeon Jang, Ho Young Lee, Suk Hoon Ohn
PURPOSE: We utilized cerebral blood volume (CBV) magnetic resonance imaging and diffusion tensor imaging (DTI) to investigate changes in cognitive networks in patients experiencing cognitive dysfunction following electrical injury. METHODS: Cognitive function was assessed across various domains, including attention, verbal memory, executive function, and language. Depressive symptoms were also evaluated. CBV maps and DTI measures were obtained from 24 patients (age, 41...
July 8, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28689260/extended-diffusion-weighted-magnetic-resonance-imaging-with-two-compartment-and-anomalous-diffusion-models-for-differentiation-of-low-grade-and-high-grade-brain-tumors-in-pediatric-patients
#11
Delilah Burrowes, Jason R Fangusaro, Paige C Nelson, Bin Zhang, Nitin R Wadhwani, Michael J Rozenfeld, Jie Deng
PURPOSE: The purpose of this study was to examine advanced diffusion-weighted magnetic resonance imaging (DW-MRI) models for differentiation of low- and high-grade tumors in the diagnosis of pediatric brain neoplasms. METHODS: Sixty-two pediatric patients with various types and grades of brain tumors were evaluated in a retrospective study. Tumor type and grade were classified using the World Health Organization classification (WHO I-IV) and confirmed by pathological analysis...
July 8, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28689259/differential-diagnosis-of-parkinsonism-by-a-combined-use-of-diffusion-kurtosis-imaging-and-quantitative-susceptibility-mapping
#12
Kenji Ito, Chigumi Ohtsuka, Kunihiro Yoshioka, Hiroyuki Kameda, Suguru Yokosawa, Ryota Sato, Yasuo Terayama, Makoto Sasaki
PURPOSE: We investigated whether diffusion kurtosis imaging (DKI) and quantitative susceptibility mapping (QSM) could detect pathological changes that occur in Parkinson's disease (PD), multiple system atrophy with predominant parkinsonism (MSA-P) or predominant cerebellar ataxia (MSA-C), and progressive supranuclear palsy syndrome (PSPS) and thus be used for differential diagnosis that is often difficult. METHODS: Seventy patients (41 with PD, 6 with MSA-P, 7 with MSA-C, 16 with PSPS) and 20 healthy controls were examined using a 3...
July 8, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28689258/differences-in-dynamic-and-static-functional-connectivity-between-young-and-elderly-healthy-adults
#13
Ji Eun Park, Seung Chai Jung, Kyeoung Hwa Ryu, Joo Young Oh, Ho Sung Kim, Choong-Gon Choi, Sang Joon Kim, Woo Hyun Shim
PURPOSE: Brain connectivity is highly dynamic, but functional connectivity (FC) studies using resting-state functional magnetic resonance imaging (rs-fMRI) assume it to be static. This study assessed differences in dynamic FC between young healthy adults (YH) and elderly healthy adults (EH) compared to static FC. METHODS: Using rs-fMRI data from 12 YH and 31 EH, FC was assessed in six functional regions (subcortical, auditory [AUD], sensorimotor [SM], visuospatial [VS], cognitive control [CC], and default mode network [DMN])...
July 8, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28689257/fluid-attenuated-inversion-recovery-vascular-hyperintensities-in-predicting-cerebral-hyperperfusion-after-intracranial-arterial-stenting
#14
Chih-Cheng Wan, David Yen-Ting Chen, Ying-Chi Tseng, Feng-Xian Yan, Kun-Yu Lee, Chen-Hua Chiang, Chi-Jen Chen
PURPOSE: No reliable imaging sign predicting cerebral hyperperfusion after intracranial arterial stenting (IAS) had been described in the literature. This study evaluated the effect of fluid-attenuated inversion recovery vascular hyperintensities (FVHs), also called hyperintense vessel sign on T2-weighted fluid-attenuated inversion recovery (T2-FLAIR) MR images, in predicting significant increase in cerebral blood flow (CBF) defined by arterial spin labeling (ASL) after IAS. METHODS: We reviewed ASL CBF images and T2-FLAIR MR images before (D0), 1 day after (D1), and 3 days after (D3) IAS of 16 patients...
July 8, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28676888/spinal-cord-microstructure-integrating-phase-sensitive-inversion-recovery-and-diffusional-kurtosis-imaging
#15
V Panara, R Navarra, P A Mattei, E Piccirilli, A R Cotroneo, N Papinutto, R G Henry, A Uncini, M Caulo
PURPOSE: The aim of this prospective study was to determine the feasibility in terms of repeatability and reproducibility of diffusional kurtosis imaging (DKI) for microstructural assessment of the normal cervical spinal cord (cSC) using a phase-sensitive inversion recovery (PSIR) sequence as the anatomical reference for accurately defining white-matter (WM) and gray-matter (GM) regions of interests (ROIs). METHODS: Thirteen young healthy subjects were enrolled to undergo DKI and PSIR sequences in the cSC...
July 4, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28667360/cortical-venous-disease-severity-in-melas-syndrome-correlates-with-brain-lesion-development
#16
M T Whitehead, M Wien, B Lee, N Bass, A Gropman
PURPOSE: MELAS syndrome is a mitochondrial disorder typified by recurrent stroke-like episodes, seizures, and progressive brain injury. Abnormal mitochondria have been found in arterial walls implicating a vasculogenic etiology. We have observed abnormal cortical vein T2/FLAIR signal in MELAS patients, potentially representing wall thickening and sluggish flow. We sought to examine the relationship of hyperintense veins and brain lesions in MELAS. METHODS: Imaging databases at two children's hospitals were searched for brain MRIs from MELAS patients...
June 30, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28667359/sensitivity-of-susceptibility-weighted-imaging-in-detecting-developmental-venous-anomalies-and-associated-cavernomas-and-microhemorrhages-in-children
#17
Allen Young, Andrea Poretti, Thangamadhan Bosemani, Reema Goel, Thierry A G M Huisman
PURPOSE: Developmental venous anomalies (DVA) are common neuroimaging abnormalities that are traditionally diagnosed by contrast-enhanced T1-weighted images as the gold standard. We aimed to evaluate the sensitivity of SWI in detecting DVA and associated cavernous malformations (CM) and microhemorrhages in children in order to determine if SWI may replace contrast-enhanced MRI sequences. METHODS: Contrast-enhanced T1-weighted images were used as diagnostic gold standard for DVA...
June 30, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28647756/role-of-coronal-high-resolution-diffusion-weighted-imaging-in-acute-optic-neuritis-a-comparison-with-axial-orientation
#18
Ping Lu, Yan Sha, Hailin Wan, Feng Wang, Guohong Tian
PURPOSE: Through a comparison with the axial orientation, we aimed to evaluate the role of coronal high-resolution diffusion-weighted imaging (DWI) in acute optic neuritis based on diagnostic accuracy and the reproducibility of apparent diffusion coefficient (ADC) measurements. METHODS: Orbital DWI, using readout-segmented, parallel imaging, and 2D navigator-based reacquisition (RESOLVE-DWI), was performed on 49 patients with acute vision loss. The coronal (thickness = 3 mm) and axial (thickness = 2 mm) diffusion images were evaluated by two neuroradiologists retrospectively...
June 24, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28634647/erratum-to-training-guidelines-for-endovascular-stroke-intervention-an-international-multi-society-consensus-document
#19
S D Lavine, K Cockroft, B Hoh, N Bambakidis, A A Khalessi, H Woo, H Riina, A Siddiqui, J A Hirsch, W Chong, H Rice, J Wenderoth, P Mitchell, A Coulthard, T J Signh, C Phatouros, M Khangure, P Klurfan, K Ter Brugge, D Iancu, T Gunnarsson, O Jansen, M Muto, I Szikora, L Pierot, P Brouwer, J Gralla, S Renowden, T Andersson, J Fiehler, F Turjman, P White, A C Januel, L Spelle, Z Kulcsar, R Chapot, A Biondi, S Dima, C Taschner, M Szajner, A Krajina, N Sakai, Y Matsumaru, S Yoshimura, M Ezura, T Fujinaka, K Iihara, A Ishii, T Higashi, M Hirohata, A Hyodo, Y Ito, M Kawanishi, H Kiyosue, E Kobayashi, S Kobayashi, N Kuwayama, Y Matsumoto, S Miyachi, Y Murayama, I Nagata, I Nakahara, S Nemoto, Y Niimi, H Oishi, J Satomi, T Satow, K Sugiu, M Tanaka, T Terada, H Yamagami, O Diaz, P Lylyk, M V Jayaraman, A Patsalides, C D Gandhi, S K Lee, T Abruzzo, B Albani, S A Ansari, A S Arthur, B W Baxter, K R Bulsara, M Chen, J E Delgado Almandoz, J F Fraser, D V Heck, S W Hetts, M S Hussain, R P Klucznik, T M Leslie-Mawzi, W J Mack, R A McTaggart, P M Meyers, J Mocco, C J Prestigiacomo, G L Pride, P A Rasmussen, R M Starke, P J Sunenshine, R W Tarr, D F Frei, M Ribo, R G Nogueira, O O Zaidat, T Jovin, I Linfante, D Yavagal, D Liebeskind, R Novakovic, S Pongpech, G Rodesch, M Soderman, A Taylor, T Krings, D Orbach, L Picard, D C Suh, H Q Zhang
No abstract text is available yet for this article.
June 20, 2017: Neuroradiology
https://www.readbyqxmd.com/read/28623483/normal-appearing-white-matter-permeability-a-marker-of-inflammation-and-information-processing-speed-deficit-among-relapsing-remitting-multiple-sclerosis-patients
#20
Eldar Eftekhari, Seyed-Parsa Hojjat, Rita Vitorino, Timothy J Carroll, Charles Grady Cantrell, Liesly Lee, Matthew W Taylor, Sarah A Morrow, Haddas Benhabib, Richard I Aviv, Andrea Kassner
PURPOSE: Blood-brain barrier breakdown (BBBB) occurs in relapsing remitting multiple sclerosis (RRMS). Relative recirculation (rR), a BBBB surrogate, may show inflammation undetectable by gadolinium. We compared normal appearing white matter (NAWM) rR in patients with and without disability measured with Symbol Digit Modalities Test and the Expanded Disability Status Scale (EDSS). METHODS: Thirty-nine RRMS patients were prospectively recruited and classified as impaired or non-impaired based on the SDMT and EDSS threshold ≥3...
June 16, 2017: Neuroradiology
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