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Specialty: Radiology

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Total 5918 results found since Jan 2013.

Towards an Accurate MRI Acute Ischemic Stroke Lesion Segmentation Based on Bioheat Equation and U-Net Model
Int J Biomed Imaging. 2022 Jul 16;2022:5529726. doi: 10.1155/2022/5529726. eCollection 2022.ABSTRACTAcute ischemic stroke represents a cerebrovascular disease, for which it is practical, albeit challenging to segment and differentiate infarct core from salvageable penumbra brain tissue. Ischemic stroke causes the variation of cerebral blood flow and heat generation due to metabolism. Therefore, the temperature is modified in the ischemic stroke region. In this paper, we incorporate acute ischemic stroke temperature profile to reinforce segmentation accuracy in MRI. Pennes bioheat equation was used to generate brain thermal...
Source: International Journal of Biomedical Imaging - July 26, 2022 Category: Radiology Authors: Abdelmajid Bousselham Omar Bouattane Mohamed Youssfi Abdelhadi Raihani Source Type: research

Co-existing intracranial and extracranial carotid atherosclerosis predicts large-artery atherosclerosis stroke recurrence: a single-center prospective study utilizing combined head-and-neck vessel wall imaging
ConclusionCo-existing intracranial HST1 and extracranial carotid atherosclerosis independently predicted LAA stroke recurrence. Combined head-and-neck HR-VWI is a promising technique for atherosclerosis imaging.Clinical relevance statementThis prospective study using combined head-and-neck HR-VWI highlighted the necessity of both intracranial culprit plaque evaluation and multi-vascular bed assessment, adding value to the prediction of stroke recurrence.Key Points•This study highlighted the necessity of both intracranial culprit plaque evaluation and multi-vascular bed assessment, adding value to the prediction of stroke...
Source: European Radiology - April 21, 2023 Category: Radiology Source Type: research

Changes in hemodynamic responses in chronic stroke survivors do not affect fMRI signal detection in a block experimental design
Abstract: The use of canonical functions to model BOLD-fMRI data in people post-stroke may lead to inaccurate descriptions of task-related brain activity. The purpose of this study was to determine whether the spatiotemporal profile of hemodynamic responses (HDRs) obtained from stroke survivors during an event-related experiment could be used to develop individualized HDR functions that would enhance BOLD-fMRI signal detection in block experiments. Our long term goal was to use this information to develop individualized HDR functions for stroke survivors that could be used to analyze brain activity associated with locomoto...
Source: Magnetic Resonance Imaging - May 3, 2013 Category: Radiology Authors: Nutta-on Promjunyakul, Brian D. Schmit, Sheila Schindler-Ivens Tags: Original Contributions Source Type: research

Paradoxical centrally increased diffusivity in perinatal arterial ischemic stroke
Conclusion Centrally increased diffusivity was associated with larger stroke volume and the involved tissue was confirmed to be infarcted on follow-up imaging. Radiologists should be aware of this unusual appearance of perinatal arterial ischemic stroke in order to avoid underestimating infarct volume or making an incorrect early diagnosis.
Source: Pediatric Radiology - August 4, 2015 Category: Radiology Source Type: research

Mechanical Thrombectomy Using the New ERIC Retrieval Device Is Feasible, Efficient, and Safe in Acute Ischemic Stroke: A Swiss Stroke Center Experience INTERVENTIONAL
CONCLUSIONS: In this observational study, the new ERIC retrieval device was technically feasible, safe, and effective in acute ischemic stroke with large-vessel occlusion.
Source: American Journal of Neuroradiology - January 13, 2016 Category: Radiology Authors: Kahles, T., Garcia-Esperon, C., Zeller, S., Hlavica, M., Anon, J., Diepers, M., Nedeltchev, K., Remonda, L. Tags: INTERVENTIONAL Source Type: research

Computed tomography perfusion as a diagnostic tool for seizures after ischemic stroke
Conclusion CTP may improve sensitivity and specificity of cortical involvement for post-stroke seizures compared to NCCT.
Source: Neuroradiology - March 9, 2016 Category: Radiology Source Type: research

Recovery of slow-5 oscillations in a longitudinal study of ischemic stroke patients
In this study, we characterized longitudinally the changes in the slow-5 oscillations in stroke patients across two different time-points. We followed a group of ischemic stroke patients (n =20) and another group of healthy older adults (n =14) over two visits separated by a minimum of three months (average of 9months). For the stroke patients, one visit occurred in their subacute window (10days to 6months after stroke onset), the other took place in their chronic window (>6months after stroke). Using a mid-order group ICA method on 10-minutes eyes-closed resting-state fMRI data, we assessed the frequency distributi...
Source: NeuroImage: Clinical - March 17, 2016 Category: Radiology Source Type: research

Differences in aortic vortex flow pattern between normal and patients with stroke: qualitative and quantitative assessment using transesophageal contrast echocardiography
This study aimed to characterize aortic vortex flow pattern using transesophageal contrast echocardiography in normal and stroke patients. A total of 85 patients who diagnosed with ischemic stroke and 16 normal controls were recruited for this study. The 16 normal control subjects were designated as the control group, and the 85 ischemic stroke patients were designated as the stroke group. All subjects underwent contrast transesophageal echocardiography (TEE), and particle image velocimetry was used to assess aortic vortex flow. Qualitative and quantitative analyses of vortex flow morphology, location, phasic variation, an...
Source: The International Journal of Cardiovascular Imaging - May 31, 2016 Category: Radiology Source Type: research

Endovascular Management of Tandem Occlusion Stroke Related to Internal Carotid Artery Dissection Using a Distal to Proximal Approach: Insight from the RECOST Study EXTRACRANIAL VASCULAR
CONCLUSIONS: Mechanical endovascular treatment of carotid artery dissection tandem occlusions is safe and effective compared with isolated anterior circulation occlusion stroke therapy. Hence, a more conservative approach with stent placement only in cases of circle of Willis insufficiency may be a reliable and safe strategy.
Source: American Journal of Neuroradiology - July 13, 2016 Category: Radiology Authors: Marnat, G., Mourand, I., Eker, O., Machi, P., Arquizan, C., Riquelme, C., Ayrignac, X., Bonafe, A., Costalat, V. Tags: EXTRACRANIAL VASCULAR Source Type: research

Voxel-based lesion symptom mapping analysis of depressive mood in patients with isolated cerebellar stroke: A pilot study
Publication date: Available online 12 November 2016 Source:NeuroImage: Clinical Author(s): Na Young Kim, Sang Chul Lee, Ji-Cheol Shin, Ji Eun Park, Yong Wook Kim Post-stroke depression (PSD) is the most common neuropsychological sequela of stroke and occurs in approximately one-third of all stroke survivors. However, there are no well-established predictors of PSD. Depression in stroke patients is correlated with unfavorable outcomes. Meta-analyses of the relationship between PSD and lesion location have yielded contradictory results and have not adequately addressed the impact of cerebellar lesions. Furthermore, other br...
Source: NeuroImage: Clinical - November 12, 2016 Category: Radiology Source Type: research