Effect of Body Position on Dynamic Apparent Diffusion Coefficient Changes During the Cardiac Cycle in the Human Brain.

IF 3.3 2区 医学 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Naoki Ohno, Tosiaki Miyati, Masatomo Uehara, Riho Okamoto, Mitsuhito Mase, Satoshi Kobayashi
{"title":"Effect of Body Position on Dynamic Apparent Diffusion Coefficient Changes During the Cardiac Cycle in the Human Brain.","authors":"Naoki Ohno, Tosiaki Miyati, Masatomo Uehara, Riho Okamoto, Mitsuhito Mase, Satoshi Kobayashi","doi":"10.1002/jmri.29758","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>Dynamic changes in the apparent diffusion coefficient (ΔADC) during the cardiac cycle reflect water molecule fluctuations in the brain and intracranial conditions. While body position strongly affects intracranial conditions, the relationship between ΔADC and body position has been less explored, as conventional MRI is typically performed only in the supine position.</p><p><strong>Purpose: </strong>To investigate ΔADC and mean ADC (ADC<sub>mean</sub>) of the brain in supine and sitting positions using a multi-posture MRI system.</p><p><strong>Study type: </strong>Prospective.</p><p><strong>Subjects: </strong>Nine healthy volunteers (all males; mean age, 23.5 years).</p><p><strong>Field strength/sequence: </strong>0.4 T, electrocardiographically synchronized single-shot diffusion echo-planar imaging sequence with b-values of 0 and 500 s/mm<sup>2</sup>.</p><p><strong>Assessment: </strong>ADC maps were generated at multiple cardiac phases in each subject in the sitting and supine positions. For each position, an ADC<sub>mean</sub> map was then generated as the voxel-wise mean ADC across all phases, and a ΔADC map was generated as the voxel-wise maximum difference in ADC across phases. ΔADC and ADC<sub>mean</sub> were measured in 2 frontal and 2 occipital lobe regions and averaged. ΔADC, ADC<sub>mean</sub>, and heart rate (HR) were compared between supine and sitting positions.</p><p><strong>Statistical tests: </strong>Wilcoxon signed-rank test. Significance was set at p < 0.05.</p><p><strong>Results: </strong>Both ΔADC and ADC<sub>mean</sub> were significantly higher in the sitting position compared with the supine position (ΔADC: 0.84 ± 0.06 × 10<sup>-3</sup> mm<sup>2</sup>/s vs. 0.68 ± 0.05 × 10<sup>-3</sup> mm<sup>2</sup>/s; ADC<sub>mean</sub>: 0.87 ± 0.02 × 10<sup>-3</sup> mm<sup>2</sup>/s vs. 0.79 ± 0.06 × 10<sup>-3</sup> mm<sup>2</sup>/s, respectively). These increases were consistent across all participants. In addition, HR was significantly higher in the sitting position compared with the supine position (73.8 ± 8.4 bpm vs. 58.1 ± 3.7 bpm).</p><p><strong>Data conclusion: </strong>ΔADC and ADC<sub>mean</sub> of the brain are significantly higher in the sitting position than in the supine position.</p><p><strong>Evidence level: </strong>2. Technical Efficacy: Stage 1.</p>","PeriodicalId":16140,"journal":{"name":"Journal of Magnetic Resonance Imaging","volume":" ","pages":""},"PeriodicalIF":3.3000,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnetic Resonance Imaging","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1002/jmri.29758","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING","Score":null,"Total":0}
引用次数: 0

Abstract

Background: Dynamic changes in the apparent diffusion coefficient (ΔADC) during the cardiac cycle reflect water molecule fluctuations in the brain and intracranial conditions. While body position strongly affects intracranial conditions, the relationship between ΔADC and body position has been less explored, as conventional MRI is typically performed only in the supine position.

Purpose: To investigate ΔADC and mean ADC (ADCmean) of the brain in supine and sitting positions using a multi-posture MRI system.

Study type: Prospective.

Subjects: Nine healthy volunteers (all males; mean age, 23.5 years).

Field strength/sequence: 0.4 T, electrocardiographically synchronized single-shot diffusion echo-planar imaging sequence with b-values of 0 and 500 s/mm2.

Assessment: ADC maps were generated at multiple cardiac phases in each subject in the sitting and supine positions. For each position, an ADCmean map was then generated as the voxel-wise mean ADC across all phases, and a ΔADC map was generated as the voxel-wise maximum difference in ADC across phases. ΔADC and ADCmean were measured in 2 frontal and 2 occipital lobe regions and averaged. ΔADC, ADCmean, and heart rate (HR) were compared between supine and sitting positions.

Statistical tests: Wilcoxon signed-rank test. Significance was set at p < 0.05.

Results: Both ΔADC and ADCmean were significantly higher in the sitting position compared with the supine position (ΔADC: 0.84 ± 0.06 × 10-3 mm2/s vs. 0.68 ± 0.05 × 10-3 mm2/s; ADCmean: 0.87 ± 0.02 × 10-3 mm2/s vs. 0.79 ± 0.06 × 10-3 mm2/s, respectively). These increases were consistent across all participants. In addition, HR was significantly higher in the sitting position compared with the supine position (73.8 ± 8.4 bpm vs. 58.1 ± 3.7 bpm).

Data conclusion: ΔADC and ADCmean of the brain are significantly higher in the sitting position than in the supine position.

Evidence level: 2. Technical Efficacy: Stage 1.

体位对人脑心动周期动态表观扩散系数变化的影响
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
CiteScore
9.70
自引率
6.80%
发文量
494
审稿时长
2 months
期刊介绍: The Journal of Magnetic Resonance Imaging (JMRI) is an international journal devoted to the timely publication of basic and clinical research, educational and review articles, and other information related to the diagnostic applications of magnetic resonance.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信