Investigative magnetic resonance imaging最新文献_第3页

Osteochondroma in the Rib: A Case Report Reviewing Magnetic Resonance Imaging Findings 肋骨骨软骨瘤:一病例报告回顾磁共振成像结果

Investigative magnetic resonance imaging Pub Date : 2023-01-01 DOI: 10.13104/imri.2023.0001

Yoon Yeong Choi, Ro Woon Lee, Kyu Hong Lee, Y. Yoon

引用次数: 0

Quantitative Susceptibility Mapping of Oxygen Metabolism: A Feasibility Study Utilizing a Large-Scale Clinical Dataset 氧代谢的定量易感性图谱:利用大规模临床数据集的可行性研究

Investigative magnetic resonance imaging Pub Date : 2023-01-01 DOI: 10.13104/imri.2023.0013

Woojin Chung, Jinhee Jang, Yoonho Nam

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Cerebrovascular Arteriopathy in Microcephalic Osteodysplastic Primordial Dwarfism Type II 小头型成骨异常原始侏儒症II型的脑血管动脉病变

Investigative magnetic resonance imaging Pub Date : 2023-01-01 DOI: 10.13104/imri.2022.1106

S. Lee, Seunghyun Lee, Young Hun Choi, Yeon Jin Cho, J. Cheon

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Clinical Utility of Limited T2-Weighted-Only Lumbar Spine MRI in Pain Intervention Clinics 有限t2加权腰椎MRI在疼痛干预临床中的应用

Investigative magnetic resonance imaging Pub Date : 2023-01-01 DOI: 10.13104/imri.2022.1100

Hyeon Ui Choi, Eugene Lee, J. Lee, Bo Ram Kim

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Retroperitoneal Leiomyoma With Exophytic Growing into the Lesser Sac: A Case Report 腹膜后平滑肌瘤伴外生性生长至小囊1例

Investigative magnetic resonance imaging Pub Date : 2023-01-01 DOI: 10.13104/imri.2022.1116

Hyeon-suk Lee, Mihyun Park

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Incidentally Detected Löffler’s Syndrome on Abdomen Magnetic Resonance Imaging: Case Report 腹部磁共振偶然发现Löffler综合征1例

Investigative magnetic resonance imaging Pub Date : 2023-01-01 DOI: 10.13104/imri.2023.0011

Yedaun Lee

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Arterial Spin Labeling Perfusion MRI Signal Processing Through Traditional Methods and Machine Learning. 通过传统方法和机器学习进行动脉自旋标记灌注磁共振成像信号处理

Investigative magnetic resonance imaging Pub Date : 2022-12-01 Epub Date: 2022-12-31 DOI: 10.13104/imri.2022.26.4.220

Ze Wang

{"title":"Arterial Spin Labeling Perfusion MRI Signal Processing Through Traditional Methods and Machine Learning.","authors":"Ze Wang","doi":"10.13104/imri.2022.26.4.220","DOIUrl":"10.13104/imri.2022.26.4.220","url":null,"abstract":"Arterial spin labeling (ASL) perfusion MRI is a non-invasive technique for quantifying and mapping cerebral blood flow (CBF). Depending on the tissue signal change after magnetically labeled arterial blood enters the brain tissue, ASL MRI signal can be affected by several factors, including the volume of arrived arterial blood, signal decay of labeled blood, physiological fluctuations of the brain and CBF, and head motion, etc. Some of them can be controlled using sophisticated state-of-art ASL MRI sequences, but the others can only be resolved with post-processing strategies. Over the decades, various post-processing methods have been proposed in the literature, and many post processing software packages have been released. This self-contained review provides a brief introduction to ASL MRI, recommendations for typical ASL MRI data acquisition protocols, an overview of the ASL data processing pipeline, and an introduction to typical methods used at each step in the pipeline. Although the main focus is on traditional heuristic model-based methods, a brief introduction to recent machine learning-based approaches is provided too.","PeriodicalId":73505,"journal":{"name":"Investigative magnetic resonance imaging","volume":"26 4","pages":"220-228"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9851083/pdf/nihms-1863401.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10614273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic resonance imaging of the monkey fetal brain in utero. 宫内猴胎儿大脑的磁共振成像。

Investigative magnetic resonance imaging Pub Date : 2022-12-01 Epub Date: 2022-12-31 DOI: 10.13104/imri.2022.26.4.177

Xiaodong Zhang

{"title":"Magnetic resonance imaging of the monkey fetal brain in utero.","authors":"Xiaodong Zhang","doi":"10.13104/imri.2022.26.4.177","DOIUrl":"10.13104/imri.2022.26.4.177","url":null,"abstract":"Non-human primates (NHPs) are the closest living relatives of the human and play a critical role in investigating the effects of maternal viral infection and consumption of medicines, drugs, and alcohol on fetal development. With the advance of contemporary fast MRI techniques with parallel imaging, fetal MRI is becoming a robust tool increasingly used in clinical practice and preclinical studies to examine congenital abnormalities including placental dysfunction, congenital heart disease (CHD), and brain abnormalities non-invasively. Because NHPs are usually scanned under anesthesia, the motion artifact is reduced substantially, allowing multi-parameter MRI techniques to be used intensively to examine the fetal development in a single scanning session or longitudinal studies. In this paper, the MRI techniques for scanning monkey fetal brains in utero in biomedical research are summarized. Also, a fast imaging protocol including T2-weighted imaging, diffusion MRI, resting-state functional MRI (rsfMRI) to examine rhesus monkey fetal brains in utero on a clinical 3T scanner is introduced.","PeriodicalId":73505,"journal":{"name":"Investigative magnetic resonance imaging","volume":"26 4","pages":"177-190"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10019598/pdf/nihms-1864514.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9163084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of white matter and grey matter alteration in the monkey brain following ischemic stroke by using diffusion tensor imaging. 利用弥散张量成像研究缺血性中风后猴脑白质和灰质的改变。

Investigative magnetic resonance imaging Pub Date : 2022-12-01 Epub Date: 2022-12-31 DOI: 10.13104/imri.2022.26.4.275

Chun-Xia Li, Yuguang Meng, Yumei Yan, Doty Kempf, Leonard Howell, Frank Tong, Xiaodong Zhang

{"title":"Investigation of white matter and grey matter alteration in the monkey brain following ischemic stroke by using diffusion tensor imaging.","authors":"Chun-Xia Li, Yuguang Meng, Yumei Yan, Doty Kempf, Leonard Howell, Frank Tong, Xiaodong Zhang","doi":"10.13104/imri.2022.26.4.275","DOIUrl":"10.13104/imri.2022.26.4.275","url":null,"abstract":"Background: Investigation of stroke lesion has mostly focused on grey matter (GM) in previous studies and white matter (WM) degeneration during acute stroke is understudied. In the present study, monkeys were utilized to investigate the alterations of GM and WM in the brain following ischemic occlusion using diffusion tensor imaging (DTI).Methods: Permanent middle cerebral artery occlusion (pMCAO) was induced in rhesus monkeys (n=6) with an interventional approach. Serial DTI was conducted on a clinical 3T in the hyperacute phase (2-6 hours), 48, and 96 hours post occlusion. Regions of interest in GM and WM of lesion areas were selected for data analysis.Results: Mean diffusivity (MD), radial diffusivity (RD), and axial Diffusivity (AD) in WM decreased substantially during hyperacute stroke, as similar as those seen in GM. No obvious fractional anasotropy (FA) changes were seen in GM and WM during hyper acute phase. until 48 hours post stroke when significant fiber losses were oberved also. Pseudo-normalization of MD, AD, and RD was seen at 96 hours. Pathological changes of WM and GM were observed in ischemic areas at 8, 48, and 96 hours post stroke. Relative changes of MD, AD and RD of WM were correlated negatively with infarction volumes at 6 hours post stroke.Conclusion: The present study revealed the microstructural changes in gray matter and white matter of monkey brains during acute stroke by using DTI. The preliminary results suggest axial and radial diffusivity (AD and RD) may be sensitive surrogate markers to assess specific microstructural changes in white matter during hyper-acute stroke.","PeriodicalId":73505,"journal":{"name":"Investigative magnetic resonance imaging","volume":"26 4","pages":"275-283"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9873195/pdf/nihms-1864498.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10581672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving delineation of the corticospinal tract in the monkey brain scanned with conventional DTI by using a compressed sensing based algorithm. 使用基于压缩传感的算法改进用传统 DTI 扫描的猴脑皮质脊髓束的划分。

Investigative magnetic resonance imaging Pub Date : 2022-12-01 Epub Date: 2022-12-31 DOI: 10.13104/imri.2022.26.4.265

Yuguang Meng, Chun-Xia Li, Xiaodong Zhang

{"title":"Improving delineation of the corticospinal tract in the monkey brain scanned with conventional DTI by using a compressed sensing based algorithm.","authors":"Yuguang Meng, Chun-Xia Li, Xiaodong Zhang","doi":"10.13104/imri.2022.26.4.265","DOIUrl":"10.13104/imri.2022.26.4.265","url":null,"abstract":"Background: The corticospinal tract (CST) is a major tract for motor function. It can be impaired by stroke. Its degeneration is associated with stroke outcome. Diffusion tensor imaging (DTI) tractography plays an important role in assessing fiber bundle integrity. However, it is limited in detecting crossing fibers in the brain. The crossing fiber angular resolution of intra-voxel structure (CFARI) algorithm shows potential to resolve complex fibers in the brain. The objective of the present study was to improve delineation of CST pathways in monkey brains scanned by conventional DTI.Methods: Healthy rhesus monkeys were scanned by diffusion MRI with 128 diffusion encoding directions to evaluate the CFARI algorithm. Four monkeys with ischemic occlusion were also scanned with DTI (b = 1000 s/mm2, 30 diffusion directions) at 6, 48, and 96 hours post stroke. CST fibers were reconstructed with DTI and CFARI-based tractography and evaluated. A two-way repeated MANOVA was used to determine significances of changes in DTI indices, tract number, and volumes of the CST between hemispheres or post-stroke time points.Results: CFARI algorithm revealed substantially more fibers originated from the ventral premotor cortex in healthy and stroke monkey brains than DTI tractography. In addition, CFARI showed better sensitivity in detecting CST abnormality than DTI tractography following stroke.Conclusion: CFARI significantly improved delineation of the CST in the brain scanned by DTI with 30 gradient directions. It showed better sensitivity in detecting abnormity of the CST following stroke. Preliminary results suggest that CFARI could facilitate prediction of function outcomes after stroke.","PeriodicalId":73505,"journal":{"name":"Investigative magnetic resonance imaging","volume":"26 4","pages":"265-274"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9873154/pdf/nihms-1864509.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10581671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0