scholarly journals Diagnosis of Early Neurological Deterioration after Intravenous Thrombolysis for Patients with Cerebral Ischemic Stroke Using Compressed Sensing-Magnetic Resonance Imaging Algorithm

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Junjun Wang ◽  
Benxiao Wang ◽  
Yongliang Tang ◽  
Hui Yan
Keyword(s):  
Magnetic Resonance Imaging ◽  
Compressed Sensing ◽  
Intravenous Thrombolysis ◽  
Control Group ◽  
Great Vessel ◽  
Resonance Imaging ◽  
Early Neurological Deterioration ◽  
Cerebral Ischemic Stroke ◽  
Cerebral Ischemic ◽  
Deterioration Group

This study was to explore the risk factors and prognosis of early neurological deterioration (END) after intravenous thrombolysis in patients with cerebral ischemic stroke (CIS) with the guidance of magnetic resonance imaging (MRI) under the compressed sensing-MRI (CSMRI) algorithm. 187 patients with CIS in the hospital were selected and grouped into a deterioration group and a control group according to whether they had END. The CSMRI algorithm was constructed and compared with digital television (DTV) algorithm and Bayesian compressed sensing (BCS) algorithm. It was found that the reconstruction time of CSMRI algorithm in platform I (1134.9 s) and platform II (2615.8 s) was visibly lower than that of DTV algorithm (2634.6 s, 3963.4 s) and BCS algorithm (5631.5 s, 7412.3 s), showing statistically obvious differences ( P < 0.05 ). In addition, the reconstruction efficiency of the CSMRI algorithm was the best. After 4 hours of intravenous thrombolysis, the stroke scale score (12.3 scores) of the deterioration group was much higher than that of the control group (8.4 scores) ( P < 0.05 ). The occlusion of responsible great vessel in the deterioration group (30 cases, 83.33%) was obviously higher in contrast to that in the control group (74 cases, 49%) ( P < 0.05 ). Stroke scale score and occlusion of responsible great vessel were risk factors for EBD after intravenous thrombolysis.

scholarly journals Multilevel Clustering-Evolutionary Random Support Vector Machine Cluster Algorithm-Based Functional Magnetic Resonance Imaging in Diagnosing Cerebral Ischemic Stroke

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Kun Fan ◽  
Ting Zhang ◽  
Weihong He
Keyword(s):  
Magnetic Resonance Imaging ◽  
Support Vector Machine ◽  
Magnetic Resonance ◽  
Cognitive Assessment ◽  
Intervention Group ◽  
Support Vector ◽  
Control Group ◽  
Resonance Imaging ◽  
Cerebral Ischemic Stroke ◽  
Cerebral Ischemic

This study was to explore the value of the blood oxygenation level dependent-functional magnetic resonance imaging (BOLD-fMRI) image classification based on the multilevel clustering-evolutionary random support vector machine cluster (MCRSVMC) algorithm in the diagnosis and treatment of patients with cognitive impairment after cerebral ischemic stroke (CIS). The MCRSVMC algorithm was optimized using a clustering algorithm, and it was compared with other algorithms in terms of accuracy (ACC), sensitivity (SEN), and specificity (SPE) of classifying the brain area images. 36 patients with cognitive impairment after CIS and nondementia patients were divided into a control group (drug treatment) and an intervention group (drug + acupuncture) according to different treatment methods, with 18 cases in each group. The changes in regional homogeneity (ReHo) of BOLD-fMRI images and the differences in scores of the Montreal Cognitive Assessment Scale (MoCA), scores of Loewenstein Occupational Therapy Cognitive Assessment (LOTCA), and scores of Functional Independence Measure (FIM) between the two groups of patients were compared before and after treatment. The results revealed that the average classification ACC, SEN, and SPE of the MCRSVMC algorithm were 84.25 ± 4.13%, 91.07 ± 3.51%, and 89 ± 3.96%, respectively, which were all obviously better than those of other algorithms ( P < 0.01 ). When the number of support vector machine (SVM) classifiers and the number of important features were 410 and 260, respectively, the classification ACC of MCRSVMC algorithm was 0.9429 and 0.9092, respectively. After treatment, the MoCA score, LOTCA score, and FIM score of the patients in the intervention group were higher than those of the control group ( P < 0.05 ). The ReHo values of the right inferior temporal gyrus and right inferior frontal gyrus of patients in the intervention group were much higher than those of the control group ( P < 0.05 ). It indicated that the classification ACC, SEN, and SPE of the magnetic resonance imaging (MRI) based on the MCRSVMC algorithm in this study were greatly improved, and the acupuncture method was more effective in the treatment of patients with cognitive dysfunction after CIS.

scholarly journals Compressed Sensing Algorithm-Based Magnetic Resonance Imaging Guided for Prognosis of Early Neurological Deterioration after Intravenous Thrombolysis in Ischemic Stroke Patients

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Yiwei Huang ◽  
Xiaoyun Sun ◽  
Yinping Yao ◽  
Yejun Chen ◽  
Yan Chen ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Risk Factors ◽  
Univariate Analysis ◽  
Intravenous Thrombolysis ◽  
Neurological Deterioration ◽  
Resonance Imaging ◽  
Blood Cell Count ◽  
Nihss Score ◽  
Early Neurological Deterioration ◽  
Watershed Infarction

This work was aimed to study the risk factors and prognostic treatment for acute ischemic stroke (AIS) patients with early neurological deterioration (END) after intravenous thrombolytic therapy via compressed sensing algorithm-based magnetic resonance imaging (CS-MRI). 231 patients who were diagnosed with AIS were selected, and the final involved number of patients was 182. Patients with AIS were treated with intravenous thrombolysis with alteplase within 4.5 hours of onset. After treatment, patients with early neurological deterioration were defined as the deteriorating group and those without early neurological impairment were defined as the nondeteriorating group. In univariate analysis, hypertension, white blood cell count, and National Institutes of Health Stroke Scale (NIHSS) score were correlated with the occurrence of END. Under the CS-MRI theory, the two groups of patients were evaluated for middle cerebral artery basal ganglia infarction and internal watershed infarction. After univariate analysis, the P < 0.1 variables were taken as the independent variable, and the binary logistic regression model was adopted for multivariate regression analysis. It was disclosed that NIHSS score was not correlated with the occurrence of early neurological function deterioration, while homocysteine was. Hypertension, white blood cell count, homocysteine, and NIHSS score were risk factors for END. The image analysis revealed that the incidence of deteriorating basal ganglia infarction group was lower relative to the nondeteriorating group, and the incidence of watershed infarction was higher in the deteriorating group versus the nondeteriorating group. The image analysis suggested that predicting the occurrence of END through risk factors can actively provide endovascular treatment for patients with AIS.

scholarly journals Using brain functional magnetic resonance imaging to evaluate the effectiveness of acupuncture combined with mirror therapy on upper limb function in patients with cerebral ischemic stroke: a study protocol for a randomized, controlled trial

Trials ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Mingzhu Xu ◽  
Run Lin ◽  
Jing Luo ◽  
Chunzhi Tang ◽  
Shuhui Wang ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Ischemic Stroke ◽  
Upper Limb ◽  
Mirror Therapy ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Randomized Controlled ◽  
Cerebral Ischemic Stroke ◽  
Cerebral Ischemic ◽  
Upper Limb Dysfunction

Abstract Background Upper limb and hand motor dysfunction is one of the challenges in rehabilitation after cerebral ischemic stroke (CIS), and the clinical efficacy of rehabilitation needs to be improved. This study aims to combine Jin’s three-needle acupuncture (JTN) therapy with mirror therapy (MT) for hemiplegia after CIS, objectively evaluate the clinical effects and safety of JTN to treat upper limb dysfunction, and use functional magnetic resonance imaging (fMRI) of the brain to investigate the central mechanisms of the effects, which would provide a powerful evidence-based medical basis for further supporting the application of JTN combined with MT. Methods/design This trial will be a single-blind, randomized controlled study. Patients who meet the study criteria will be recruited and randomly assigned to either the combined treatment group (JTN+MT) or the JTN group. Both interventions will be conducted for 6 days per week and last for 4 weeks. The primary outcome will be the effective rate based on the Fugl–Meyer Assessment for Upper Extremity (FMA-UE). Other outcome measures will include scores on the motor assessment scale (MAS), action research arm test (ARAT), activities of daily living (ADL) scale, and fMRI analyses. For safety evaluation, adverse events will be observed and recorded. Discussion This study may help to identify the efficacy and safety of acupuncture combined with MT for upper limb dysfunction after CIS and explore the central mechanisms with brain fMRI. Trial registration Chinese Clinical Trial Registry ChiCTR-IOR-17012174. Registered on 5 April 2017.

Does diffusion-weighted magnetic resonance imaging have a place in the differential diagnosis of brucella sacroiliitis and seronegative spondyloarthropathy?

2020 ◽  
pp. 028418512093837
Author(s):  
Sunay Sibel Karayol ◽  
Kudret Cem Karayol
Keyword(s):  
Magnetic Resonance Imaging ◽  
Bone Marrow ◽  
Differential Diagnosis ◽  
Magnetic Resonance ◽  
Control Group ◽  
Resonance Imaging ◽  
Visual Evaluation ◽  
Mean Values ◽  
Diffusion Weighted ◽  
The Mean

Background The aim of this study is to investigate the role of diffusion-weighted imaging (DWI) in the differential diagnosis of sacroiliitis. Purpose To compare the sacroiliac magnetic resonance imaging (MRI) examinations of patients with suspected active sacroiliitis with patients with acute SpA MR findings and the DWI examinations of patients with acute brucella sacroiliitis, and thereby determine whether DWI can contribute to the differential diagnosis. Material and Methods A total of 84 patients were included in the study and were separated into three groups: group 1 (13 women, 6 men) comprised cases with brucella positive for sacroiliitis; group 2 (17 women, 19 men) comprised cases negative for brucella but with sacroiliitis; and group 3 (16 women, 13 men) comprised cases negative for brucella and sacroiliitis. Results The mean bone marrow apparent diffusion coefficient (ADC) values independently of edema were determined as 0.71 × 10−3 in sacroiliitis and brucella-positive patients, as 0.53 × 10−3 in brucella-negative and sacroiliitis-positive patients, and as 0.43 × 10−3 in the control group of brucella-negative sacroiliitis-negative patients. In the ADC measurements taken from areas of evident edema in patients with sacroiliitis, the mean values were 0.13 × 10−3 in the brucella-positive group and 0.12 × 10−3 in the brucella-negative group. Conclusion By adding DWI, which is a rapid MR sequence, to sacroiliac joint MR examination, normal bone marrow and bone marrow with sacroiliitis can be objectively differentiated with ADC measurements in addition to visual evaluation.

scholarly journals An Augmented Lagrangian Based Compressed Sensing Reconstruction for Non-Cartesian Magnetic Resonance Imaging without Gridding and Regridding at Every Iteration

PLoS ONE ◽  
2014 ◽  
Vol 9 (9) ◽  
pp. e107107 ◽  
Author(s):  
Mehmet Akçakaya ◽  
Seunghoon Nam ◽  
Tamer A. Basha ◽  
Keigo Kawaji ◽  
Vahid Tarokh ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Compressed Sensing ◽  
Augmented Lagrangian ◽  
Resonance Imaging

scholarly journals The computer and magnetic resonance imaging in the early assessment of the clinical course of ischemic stroke

2019 ◽  
Vol 18 (2) ◽  
pp. 35-40
Author(s):  
R. Kh. Aldatov ◽  
V. A. Fokin
Keyword(s):  
Magnetic Resonance Imaging ◽  
Ischemic Stroke ◽  
Magnetic Resonance ◽  
Intravenous Thrombolysis ◽  
Neurological Symptoms ◽  
Limiting Factor ◽  
Resonance Imaging ◽  
Early Assessment ◽  
Stage Of Development ◽  
The Moment

The most important benefit that imaging provides to a patient with ischemic stroke is the rapid identification of those patients who are most likely to benefit from emergency treatment. This group includes patients who suffer from severe neurological symptoms due to the occlusion of the main artery, and those who are candidates for recanalization by intravenous thrombolysis or intra-arterial intervention to remove blockage.Objective – to assess the sensitivity and significance of computed tomography and magnetic resonance imaging in early diagnosis of infarction foci.Material and methods. The results of radiologic studies of 89 patients with a clinical picture, suspected of acute ischemic cerebral circulation disorders, received in the first 24 hours from the moment of development of neurological symptoms were analyzed.Results. As a result of our study, it was shown that in the first group of patients received in the first 4.5 h from the moment of development of neurological symptoms of CT-signs of stroke were not detected in 16 (76 %) of 21 patients, while those received in the first 24 h from the moment of development of neurological symptoms of CT-signs of stroke were not detected in 14 (28 %) of 50 patients, determined by the symptom of strengthening of the artery, loss of differentiation between gray and white matter of the brain, smoothness of cortical furrows and the appearance of a zone of reduced densitometric density brain substances (<22HU). The difficulties of diagnosis in some patients on CT were the size and localization of ischemic areas (lacunar, stem strokes). In group II of 18 patients of the study, native MRI revealed signs of ischemic areas in 10 patients out of 10, complex CT and MRI to determined areas of hypoperfusion in 8 patients out of 8.Conclusion. CT is the most widely used imaging technique for cerebral infarction with high sensitivity to intracerebral hemorrhage, high specificity in ischemia, but low sensitivity to the detection of ischemic changes is a limiting factor. The data obtained confirm that MRI is a reliable method of diagnosing ischemic stroke. The most sensitive in the diagnosis of ischemic changes in the acute stage of development by using DWI (b1000).

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