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Total 83 results found since Jan 2013.

Stroke Mimics in the Acute Setting: Role of Multimodal CT Protocol ADULT BRAIN
CONCLUSIONS: Multimodal CT demonstrated low sensitivity but high specificity in the diagnosis of stroke mimics in the acute setting. The high specificity of multimodal CT allows ruling out stroke and thereby avoiding unnecessary revascularization treatment in patients with diagnosis of a stroke mimic.
Source: American Journal of Neuroradiology - February 4, 2022 Category: Radiology Authors: Prodi, E., Danieli, L., Manno, C., Pagnamenta, A., Pravata, E., Roccatagliata, L., Städler, C., Cereda, C. W., Cianfoni, A. Tags: ADULT BRAIN Source Type: research

Imaging of amide proton transfer and nuclear Overhauser enhancement in ischemic stroke with corrections for competing effects
This study may help us to better understand the contrast mechanisms of APT and NOE imaging in ischemic stroke, and may also establish a framework for future stroke measurements using CEST imaging with spillover, MT and T1 corrections. Copyright © 2014 John Wiley & Sons, Ltd. Amide proton transfer (APT) and nuclear Overhauser enhancement (NOE) images were acquired in rats with ischemic stroke and analyzed using corrections for radiofrequency (RF) spillover, magnetization transfer (MT) and T1 effects. Compared with the conventional three‐offset method (APT*), the corrected APT (apparent exchange‐dependent relaxation...
Source: NMR in Biomedicine - December 7, 2014 Category: Radiology Authors: Hua Li, Zhongliang Zu, Moritz Zaiss, Imad S. Khan, Robert J. Singer, Daniel F. Gochberg, Peter Bachert, John C. Gore, Junzhong Xu Tags: Research article Source Type: research

An efficient automated methodology for detecting and segmenting the ischemic stroke in brain MRI images
Abstract Brain tumor and brain stroke are two important causes of death in and around the world. The abnormalities in brain cell leads to brain stroke and obstruction in blood flow to brain cells leads to brain stroke. In this article, a computer aided automatic methodology is proposed to detect and segment ischemic stroke in brain MRI images using Adaptive Neuro Fuzzy Inference (ANFIS) classifier. The proposed method consists of preprocessing, feature extraction and classification. The brain image is enhanced using Heuristic histogram equalization technique. Then, texture and morphological features are extracted from the ...
Source: International Journal of Imaging Systems and Technology - August 17, 2017 Category: Radiology Authors: P. Sivakumar, P. Ganeshkumar Tags: RESEARCH ARTICLE Source Type: research

Cerebral Perfusion in Pediatric Stroke: Children Are Not Little Adults
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 i...
Source: Topics in Magnetic Resonance Imaging - October 1, 2021 Category: Radiology Tags: Review Articles Source Type: research

Brain lesions on DWI-MRI don't necessarily imply higher stroke risk
Brain lesions identified on diffusion-weighted MRI (DWI-MRI) after a patien...Read more on AuntMinnie.comRelated Reading: Thrombectomy may improve outcomes in children with LVO MRI improves outcomes in suspected stroke patients MRI links CVR reactivity to small-vessel disease in stroke patients DWI-MRI helps select suitable patients for ovarian cancer surgery Stroke indicator found on MRI could help with treatment strategies
Source: AuntMinnie.com Headlines - August 28, 2023 Category: Radiology Source Type: news

Qualitative and Quantitative Analysis of MR Imaging Findings in Patients with Middle Cerebral Artery Stroke Implanted with Mesenchymal Stem Cells BRAIN
CONCLUSIONS: Postoperative changes consistent with stereotactic implantation were seen, but no teratoma, tumor, or heterotopia was identified. Initial findings suggest a trend toward less volume loss after mesenchymal stem cell implantation compared with that in age- and sex-matched controls with chronic, stable MCA infarcts, with a significantly greater growth-to-loss ratio in the infarcted tissue.
Source: American Journal of Neuroradiology - June 11, 2015 Category: Radiology Authors: Wanamaker, C. P., Fakhran, S., Alhilali, L. M. Tags: BRAIN Source Type: research

Ultrasound imaging gauges muscle tightness after stroke
Ultrasound strain imaging can be an effective tool for assessing poststroke...Read more on AuntMinnie.comRelated Reading: MRI links lifestyle factors to stroke, dementia risk 5 risk factors help predict brain hemorrhage on CT AI algorithm can triage head CT exams for urgent review Ultrasound elastography helps identify invasive breast cancer AIUM: Can deep learning classify liver fibrosis on US?
Source: AuntMinnie.com Headlines - August 22, 2018 Category: Radiology Source Type: news

In Vivo Quantification of Cerebral Translocator Protein Binding in Humans Using 6-Chloro-2-(4'-123I-Iodophenyl)-3-(N,N-Diethyl)-Imidazo1,2-aPyridine-3-Acetamide SPECT
Conclusion: As demonstrated within a group of stroke and GBM patients, 123I-CLINDE SPECT can be used for quantitative assessment of TSPO expression in vivo. Because of the absence of a region devoid of TSPO, reference tissue models should be used with caution. The 2-tissue-compartment kinetic analysis of a 90-min dynamic scan with arterial blood sampling is recommended for the quantification of 123I-CLINDE binding with SPECT.
Source: Journal of Nuclear Medicine - December 1, 2014 Category: Radiology Authors: Feng, L., Svarer, C., Thomsen, G., de Nijs, R., Larsen, V. A., Jensen, P., Adamsen, D., Dyssegaard, A., Fischer, W., Meden, P., Krieger, D., Moller, K., Knudsen, G. M., Pinborg, L. H. Tags: Clinical Investigations Source Type: research

Magnetoencephalographic study of hand and foot sensorimotor organization in 325 consecutive patients evaluated for tumor or epilepsy surgery
Conclusions MEG localization of sensorimotor cortex activation was more successful for the hand compared to the foot. In patients with neural lesions, there were signs of brain reorganization as measured by more frequent ipsilateral motor cortical activation of the foot in addition to the traditional sensory and motor activation patterns in the contralateral hemisphere. The presence of ipsilateral neural reorganization, especially around the foot motor area, suggests that careful mapping of the hand and foot in both contralateral and ipsilateral hemispheres prior to surgery might minimize postoperative deficits.
Source: NeuroImage: Clinical - November 7, 2015 Category: Radiology Source Type: research

Susceptibility‐weighted imaging: current status and future directions
Susceptibility‐weighted imaging (SWI) is a method that uses the intrinsic nature of local magnetic fields to enhance image contrast in order to improve the visibility of various susceptibility sources and to facilitate diagnostic interpretation. It is also the precursor to the concept of the use of phase for quantitative susceptibility mapping (QSM). Nowadays, SWI has become a widely used clinical tool to image deoxyhemoglobin in veins, iron deposition in the brain, hemorrhages, microbleeds and calcification. In this article, we review the basics of SWI, including data acquisition, data reconstruction and post‐processi...
Source: NMR in Biomedicine - April 30, 2016 Category: Radiology Authors: Saifeng Liu, Sagar Buch, Yongsheng Chen, Hyun‐Seok Choi, Yongming Dai, Charbel Habib, Jiani Hu, Joon‐Yong Jung, Yu Luo, David Utriainen, Meiyun Wang, Dongmei Wu, Shuang Xia, E. Mark Haacke Tags: Special issue review article Source Type: research

Optimization of two‐compartment‐exchange‐model analysis for dynamic contrast‐enhanced mri incorporating bolus arrival time
ConclusionThis study proposes an optimized analysis method, ACoPeD, for tissue perfusion and permeability estimation using DCE‐MRI, to be used in clinical settings. J. Magn. Reson. Imaging 2016.
Source: Journal of Magnetic Resonance Imaging - July 6, 2016 Category: Radiology Authors: Guy Nadav, Gilad Liberman, Moran Artzi, Nahum Kiryati, Dafna Ben Bashat Tags: Original Research Source Type: research

Susceptibility ‐weighted imaging: current status and future directions
Susceptibility‐weighted imaging (SWI) is a method that uses the intrinsic nature of local magnetic fields to enhance image contrast in order to improve the visibility of various susceptibility sources and to facilitate diagnostic interpretation. It is also the precursor to the concept of the use of phase for quantitative susceptibility mapping (QSM). Nowadays, SWI has become a widely used clinical tool to image deoxyhemoglobin in veins, iron deposition in the brain, hemorrhages, microbleeds and calcification. In this article, we review the basics of SWI, including data acquisition, data reconstruction and post‐processi...
Source: NMR in Biomedicine - May 17, 2016 Category: Radiology Authors: Saifeng Liu, Sagar Buch, Yongsheng Chen, Hyun ‐Seok Choi, Yongming Dai, Charbel Habib, Jiani Hu, Joon‐Yong Jung, Yu Luo, David Utriainen, Meiyun Wang, Dongmei Wu, Shuang Xia, E. Mark Haacke Tags: Special issue review article Source Type: research

Optimization of two ‐compartment‐exchange‐model analysis for dynamic contrast‐enhanced mri incorporating bolus arrival time
ConclusionThis study proposes an optimized analysis method, ACoPeD, for tissue perfusion and permeability estimation using DCE‐MRI, to be used in clinical settings. J. Magn. Reson. Imaging 2016.
Source: Journal of Magnetic Resonance Imaging - July 6, 2016 Category: Radiology Authors: Guy Nadav, Gilad Liberman, Moran Artzi, Nahum Kiryati, Dafna Ben Bashat Tags: Original Research Source Type: research

Determination of multipool contributions to endogenous amide proton transfer effects in global ischemia with high spectral resolution in vivo chemical exchange saturation transfer MRI.
CONCLUSION: Combined amide and amine effects dominated the MTRasym changes after global ischemia, indicating that MTRasym is predominantly pH-sensitive and suitable for detecting tissue acidosis following acute stroke. PMID: 30058148 [PubMed - as supplied by publisher]
Source: Magnetic Resonance in Medicine - July 29, 2018 Category: Radiology Authors: Zhou IY, Lu D, Ji Y, Wu L, Wang E, Cheung JS, Zhang XA, Sun PZ Tags: Magn Reson Med Source Type: research

Patient Friendly Summary of the ACR Appropriateness Criteria: Acute Mental Status Change, Delirium, and New Onset Psychosis
Changes in mental status can be caused by a variety of factors, including intoxication, infection, stroke, bleeding, tumor, fluid, trauma or brain injury, and inflammation. This can show up as changes in behavior, alertness, agitation, confusion, and seizures. When there is high suspicion of bleeding, stroke, infection, or tumor or if the individual has extremely high blood pressure, CT or MRI without intravenous (IV) contrast may be the initial examination. If the examination without contrast does not show the cause, follow-up CT or MRI performed with IV contrast may help if a tumor or an infection is suspected.
Source: Journal of the American College of Radiology : JACR - August 31, 2020 Category: Radiology Authors: Susan Anemone, Tasneem Lalani Tags: Appropriate Use Criteria Source Type: research