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AJNR. American Journal of Neuroradiology

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https://www.readbyqxmd.com/read/29449285/relationship-between-ischemic-injury-and-patient-outcomes-after-surgical-or-endovascular-treatment-of-ruptured-anterior-communicating-artery-aneurysms
#1
LETTER
S Mugikura, S Takahashi, K Takase
No abstract text is available yet for this article.
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29449284/-reply
#2
J J Heit
No abstract text is available yet for this article.
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29449283/clinical-validation-of-a-predictive-model-for-the-presence-of-cervical-lymph-node-metastasis-in-papillary-thyroid-cancer
#3
N U Patel, K E Lind, K McKinney, T J Clark, S S Pokharel, J M Meier, E R Stamm, K Garg, B Haugen
BACKGROUND AND PURPOSE: Ultrasound is a standard technique to detect lymph node metastasis in papillary thyroid cancer. Cystic changes and microcalcifications are the most specific features of metastasis, but with low sensitivity. This prospective study compared the diagnostic accuracy of a predictive model for sonographic evaluation of lymph nodes relative to the radiologist's standard assessment in detecting papillary thyroid cancer metastasis in patients after thyroidectomy. MATERIALS AND METHODS: Cervical lymph node sonographic images were reported by a radiologist (R method) per standard practice...
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29449282/a-patient-dose-reduction-technique-for-neuroendovascular-image-guided-interventions-image-quality-comparison-study
#4
A Sonig, S V Setlur Nagesh, V S Fennell, S Gandhi, L Rangel-Castilla, C N Ionita, K V Snyder, L N Hopkins, D R Bednarek, S Rudin, A H Siddiqui, E I Levy
BACKGROUND AND PURPOSE: The ROI-dose-reduced intervention technique represents an extension of ROI fluoroscopy combining x-ray entrance skin dose reduction with spatially different recursive temporal filtering to reduce excessive image noise in the dose-reduced periphery in real-time. The aim of our study was to compare the image quality of simulated neurointerventions with regular and reduced radiation doses using a standard flat panel detector system. MATERIALS AND METHODS: Ten 3D-printed intracranial aneurysm models were generated on the basis of a single patient vasculature derived from intracranial DSA and CTA...
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29449281/mri-features-of-aquaporin-4-antibody-positive-longitudinally-extensive-transverse-myelitis-insights-into-the-diagnosis-of-neuromyelitis-optica-spectrum-disorders
#5
C G Chee, K S Park, J W Lee, H W Ahn, E Lee, Y Kang, H S Kang
BACKGROUND AND PURPOSE: Longitudinally extensive transverse myelitis is a well-documented spinal manifestation of neuromyelitis optica spectrum disorders, however, other forms of nontumorous myelopathy can also manifest as longitudinally extensive transverse myelitis. Our aim was to evaluate the MR imaging features of aquaporin-4 antibody-positive longitudinally extensive transverse myelitis, which is strongly associated with neuromyelitis optica spectrum disorders. MATERIALS AND METHODS: We evaluated cervicomedullary junction involvement, cord expansion ratios, bright spotty lesions, the number of involved segments, skipped lesions, enhancement patterns, and axial distribution patterns using spinal MR imaging of 41 patients with longitudinally extensive transverse myelitis who underwent aquaporin-4 antibody testing...
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29449280/prediction-of-the-multisegment-clot-sign-on-dynamic-ct-angiography-of-cardioembolic-stroke
#6
Z Chen, F Shi, M Zhang, X Gong, L Lin, M Lou
BACKGROUND AND PURPOSE: The multisegment clot sign has been observed at the site of large-artery occlusion in patients with acute ischemic stroke. This study aimed to assess its occurrence rate and relationship with stroke etiologies in patients with acute intracranial large-artery occlusion. MATERIALS AND METHODS: We included consecutive patients with acute ischemic stroke who had acute intracranial large-artery occlusion and underwent perfusion CT within 8 hours after stroke onset...
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29449279/mri-with-dwi-for-the-detection-of-posttreatment-head-and-neck-squamous-cell-carcinoma-why-morphologic-mri-criteria-matter
#7
A Ailianou, P Mundada, T De Perrot, M Pusztaszieri, P-A Poletti, M Becker
BACKGROUND AND PURPOSE: Although diffusion-weighted imaging combined with morphologic MRI (DWIMRI) is used to detect posttreatment recurrent and second primary head and neck squamous cell carcinoma, the diagnostic criteria used so far have not been clarified. We hypothesized that precise MRI criteria based on signal intensity patterns on T2 and contrast-enhanced T1 complement DWI and therefore improve the diagnostic performance of DWIMRI. MATERIALS AND METHODS: We analyzed 1...
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29449278/7t-brain-mrs-in-hiv-infection-correlation-with-cognitive-impairment-and-performance-on-neuropsychological-tests
#8
M Mohamed, P B Barker, R L Skolasky, N Sacktor
BACKGROUND AND PURPOSE: Validated neuroimaging markers of HIV-associated neurocognitive disorder in patients on antiretroviral therapy are urgently needed for clinical trials. The purpose of this study was to explore the relationship between cognitive impairment and brain metabolism in older subjects with HIV infection. It was hypothesized that MR spectroscopy measurements related to neuronal health and function (particularly N -acetylaspartate and glutamate) would be lower in HIV-positive subjects with worse cognitive performance...
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29449277/modeling-early-postnatal-brain-growth-and-development-with-ct-changes-in-the-brain-radiodensity-histogram-from-birth-to-2-years
#9
K A Cauley, Y Hu, J Och, P J Yorks, S W Fielden
BACKGROUND AND PURPOSE: The majority of brain growth and development occur in the first 2 years of life. This study investigated these changes by analysis of the brain radiodensity histogram of head CT scans from the clinical population, 0-2 years of age. MATERIALS AND METHODS: One hundred twenty consecutive head CTs with normal findings meeting the inclusion criteria from children from birth to 2 years were retrospectively identified from 3 different CT scan platforms...
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29439125/evaluation-of-leptomeningeal-contrast-enhancement-using-pre-and-postcontrast-subtraction-3d-flair-imaging-in-multiple-sclerosis
#10
R Zivadinov, D P Ramasamy, J Hagemeier, C Kolb, N Bergsland, F Schweser, M G Dwyer, B Weinstock-Guttman, D Hojnacki
BACKGROUND AND PURPOSE: Leptomeningeal contrast enhancement is found in patients with multiple sclerosis, though reported rates have varied. The use of 3D-fluid-attenuated inversion recovery pre- and postcontrast subtraction imaging may more accurately determine the frequency of leptomeningeal contrast enhancement. The purpose of this study was to investigate the frequency of leptomeningeal contrast enhancement using the pre- and postcontrast subtraction approach and to evaluate 3 different methods of assessing the presence of leptomeningeal contrast enhancement...
February 8, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29439124/dual-energy-ct-in-hemorrhagic-progression-of-cerebral-contusion-overestimation-of-hematoma-volumes-on-standard-120-kv-images-and-rectification-with-virtual-high-energy-monochromatic-images-after-contrast-enhanced-whole-body-imaging
#11
U K Bodanapally, K Shanmuganathan, G Issa, D Dreizin, L Guang, K Sudini, T R Fleiter
BACKGROUND AND PURPOSE: In patients with hemorrhagic contusions, hematoma volumes are overestimated on follow-up standard 120-kV images obtained after contrast-enhanced whole-body CT. We aimed to retrospectively determine hemorrhagic progression of contusion rates on 120-kV and 190-keV images derived from dual-energy CT and the magnitude of hematoma volume overestimation. MATERIALS AND METHODS: We retrospectively analyzed admission and follow-up CT studies in 40 patients with hemorrhagic contusions...
February 8, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29439123/endovascular-thrombectomy-in-wake-up-stroke-and-stroke-with-unknown-symptom-onset
#12
P Bücke, M Aguilar Pérez, V Hellstern, M AlMatter, H Bäzner, H Henkes
BACKGROUND AND PURPOSE: Mechanical thrombectomy in acute ischemic stroke within 6 hours of symptom onset is effective and safe. However, in many patients, information on the beginning of symptoms is not available. Patients can be divided into those with wake-up stroke and daytime-unwitnessed stroke. Evidence on outcome and complications after mechanical thrombectomy in wake-up stroke and daytime-unwitnessed stroke is rare. A potential beneficial effect of mechanical thrombectomy in selected patients with wake-up stroke or daytime-unwitnessed stroke is suspected...
February 8, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29439122/iron-insensitive-quantitative-assessment-of-subcortical-gray-matter-demyelination-in-multiple-sclerosis-using-the-macromolecular-proton-fraction
#13
V L Yarnykh, E P Krutenkova, G Aitmagambetova, P Repovic, A Mayadev, P Qian, L K Jung Henson, B Gangadharan, J D Bowen
BACKGROUND AND PURPOSE: Fast macromolecular proton fraction mapping is a recent quantitative MR imaging method for myelin assessment. The objectives of this study were to evaluate the macromolecular proton fraction as a measure of demyelination in subcortical GM structures in multiple sclerosis and assess a potential relationship between demyelination and excess iron deposition using the macromolecular proton fraction and T2* mapping. MATERIALS AND METHODS: Macromolecular proton fraction and T2* maps were obtained from 12 healthy controls, 18 patients with relapsing-remitting MS, and 12 patients with secondary-progressive MS using 3T MR imaging...
February 8, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29439121/brain-imaging-in-cases-with-positive-serology-for-dengue-with-neurologic-symptoms-a-clinicoradiologic-correlation
#14
H A Vanjare, P Mannam, A K Mishra, R Karuppusami, R A B Carey, A M Abraham, W Rose, R Iyyadurai, S Mani
BACKGROUND AND PURPOSE: Dengue is a common arboviral disease, which uncommonly involves the brain. There has been a recent surge in dengue cases and dengue-related deaths in tropical countries. The aim of this study was to describe brain imaging findings in patients with dengue infection having neurologic symptoms. MATERIALS AND METHODS: Thirty-five patients with positive serology for dengue with CNS symptoms undergoing imaging of the brain were included in the study...
February 8, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29439120/improved-visualization-of-cortical-lesions-in-multiple-sclerosis-using-7t-mp2rage
#15
E S Beck, P Sati, V Sethi, T Kober, B Dewey, P Bhargava, G Nair, I C Cortese, D S Reich
BACKGROUND AND PURPOSE: Cortical lesions are common and often extensive in multiple sclerosis but are difficult to visualize by MRI, leaving important questions about their clinical implications and response to therapy unanswered. Our aim was to determine whether cortical lesions are better visualized using magnetization prepared 2 rapid acquisition gradient echoes (MP2RAGE) than T2*-weighted imaging on 7T MR imaging. MATERIALS AND METHODS: Brain MR imaging using T1-weighted MP2RAGE at 500-μm isotropic resolution, T2*-weighted gradient-echo, and T2*-weighted segmented echo-planar imaging sequences were collected for 13 patients with MS and 5 age-matched neurologically healthy controls on a 7T research system...
February 8, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29419404/quantitative-analysis-of-conebeam-ct-for-delineating-stents-in-stent-assisted-coil-embolization
#16
T Kuriyama, N Sakai, M Beppu, C Sakai, H Imamura, K Masago, N Katakami, H Isoda
BACKGROUND AND PURPOSE: Innovative techniques and device-related advances have improved the outcomes of neuroendovascular treatment. 3D imaging has previously used 2 × 2 binning, but 1 × 1 binning has recently been made available. The aim of this study was to evaluate the quantitative ability of conebeam CT for stent delineation and to investigate its effectiveness in the clinical environment. MATERIALS AND METHODS: Four acquisition groups of 3D MIP images acquired using conebeam CT with varying conditions (acquisition time, 10 or 20 seconds and binning, 1 × 1 or 2 × 2) were compared...
February 1, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29419403/neuroradiology-fellowship-case-requirements-need-reform
#17
LETTER
C M Pfeifer
No abstract text is available yet for this article.
February 1, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29419402/deep-learning-in-neuroradiology
#18
REVIEW
G Zaharchuk, E Gong, M Wintermark, D Rubin, C P Langlotz
Deep learning is a form of machine learning using a convolutional neural network architecture that shows tremendous promise for imaging applications. It is increasingly being adapted from its original demonstration in computer vision applications to medical imaging. Because of the high volume and wealth of multimodal imaging information acquired in typical studies, neuroradiology is poised to be an early adopter of deep learning. Compelling deep learning research applications have been demonstrated, and their use is likely to grow rapidly...
February 1, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29419401/optimization-of-dartel-settings-for-the-detection-of-alzheimer-disease
#19
J Komatsu, I Matsunari, M Samuraki, K Shima, M Noguchi-Shinohara, K Sakai, T Hamaguchi, K Ono, H Matsuda, M Yamada
BACKGROUND AND PURPOSE: Although Diffeomorphic Anatomical Registration Through Exponentiated Lie Algebra (DARTEL) has been introduced as an alternative to conventional voxel-based morphometry, there are scant data available regarding the optimal image-processing settings. The aim of this study was to optimize image-processing and ROI settings for the diagnosis of Alzheimer disease using DARTEL. MATERIALS AND METHODS: Between May 2002 and August 2014, we selected 158 patients with Alzheimer disease and 198 age-matched healthy subjects; 158 healthy subjects served as the control group against the patients with Alzheimer disease, and the remaining 40 served as the healthy data base...
February 1, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29419400/high-signal-intensity-in-the-dentate-nucleus-and-globus-pallidus-on-unenhanced-t1-weighted-mr-images-comparison-between-gadobutrol-and-linear-gadolinium-based-contrast-agents
#20
F G Moser, C T Watterson, S Weiss, M Austin, J Mirocha, R Prasad, J Wang
BACKGROUND AND PURPOSE: In view of the recent observations that gadolinium deposits in brain tissue after intravenous injection, our aim of this study was to compare signal changes in the globus pallidus and dentate nucleus on unenhanced T1-weighted MR images in patients receiving serial doses of gadobutrol, a macrocyclic gadolinium-based contrast agent, with those seen in patients receiving linear gadolinium-based contrast agents. MATERIALS AND METHODS: This was a retrospective analysis of on-site patients with brain tumors...
February 1, 2018: AJNR. American Journal of Neuroradiology
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