{"title":"在1.5 t磁共振系统中，利用压缩传感和并行成像技术优化单次屏气下肝脏高时间分辨率磁共振成像扫描方案。","authors":"Fumiaki Fukamatsu, Akira Yamada, Hayato Hayashihara, Yoshihiro Kitou, Yasunari Fujinaga","doi":"10.1259/bjro.20210018","DOIUrl":null,"url":null,"abstract":"<p><strong>Objective: </strong>To optimize the scan protocol for high temporal resolution magnetic resonance (MR) imaging of the liver under single breath-holding, using compressed sensing (CS) and parallel imaging (PI) techniques in a 1.5 T MR system.</p><p><strong>Methods: </strong>31 healthy volunteers who underwent fat-suppressed gradient-echo <i>T</i> <sub>1</sub> weighted imaging using a 1.5 T MR system were included. Image quality was evaluated on altering various imaging parameters in CS and PI so that the scan time was adjusted to 10 and 6 s within a single breath-holding. Normalized standard deviation (nSD = SD/mean value) and signal-to-noise ratio (SNR = mean value/SD) of liver signal intensity were measured. Visual scores for the outline of the liver and inferior right hepatic vein (IRHV) were evaluated using a 4-point scale and compared with that of the reference standard (20 s scan without CS).</p><p><strong>Results: </strong>The nSD and SNR were not significantly different when the 10 s scan with CS factor 2.0 and the 6 s scan with CS factor 2.0 and 2.5 were compared to the 20 s scan. Overall visual score (mean score of the outline of the liver and IRHV) was significantly better (<i>p</i> < 0.05) with the 10 s scan with CS factor 2.0 compared to the other scan protocols.</p><p><strong>Conclusion: </strong>The 10 s scan with CS factor 2.0 should be recommended for high temporal resolution MR imaging of the liver using CS and PI in a 1.5 T MR system.</p><p><strong>Advances in knowledge: </strong>This study conducts a novel MR imaging of the liver using CS and PI in a 1.5 T MR system.</p>","PeriodicalId":72419,"journal":{"name":"BJR open","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2021-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8611679/pdf/","citationCount":"0","resultStr":"{\"title\":\"Optimization of scan protocol for high temporal resolution magnetic resonance imaging of the liver under single breath-holding using compressed sensing and parallel imaging techniques in a 1.5-T magnetic resonance system.\",\"authors\":\"Fumiaki Fukamatsu, Akira Yamada, Hayato Hayashihara, Yoshihiro Kitou, Yasunari Fujinaga\",\"doi\":\"10.1259/bjro.20210018\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Objective: </strong>To optimize the scan protocol for high temporal resolution magnetic resonance (MR) imaging of the liver under single breath-holding, using compressed sensing (CS) and parallel imaging (PI) techniques in a 1.5 T MR system.</p><p><strong>Methods: </strong>31 healthy volunteers who underwent fat-suppressed gradient-echo <i>T</i> <sub>1</sub> weighted imaging using a 1.5 T MR system were included. Image quality was evaluated on altering various imaging parameters in CS and PI so that the scan time was adjusted to 10 and 6 s within a single breath-holding. Normalized standard deviation (nSD = SD/mean value) and signal-to-noise ratio (SNR = mean value/SD) of liver signal intensity were measured. Visual scores for the outline of the liver and inferior right hepatic vein (IRHV) were evaluated using a 4-point scale and compared with that of the reference standard (20 s scan without CS).</p><p><strong>Results: </strong>The nSD and SNR were not significantly different when the 10 s scan with CS factor 2.0 and the 6 s scan with CS factor 2.0 and 2.5 were compared to the 20 s scan. Overall visual score (mean score of the outline of the liver and IRHV) was significantly better (<i>p</i> < 0.05) with the 10 s scan with CS factor 2.0 compared to the other scan protocols.</p><p><strong>Conclusion: </strong>The 10 s scan with CS factor 2.0 should be recommended for high temporal resolution MR imaging of the liver using CS and PI in a 1.5 T MR system.</p><p><strong>Advances in knowledge: </strong>This study conducts a novel MR imaging of the liver using CS and PI in a 1.5 T MR system.</p>\",\"PeriodicalId\":72419,\"journal\":{\"name\":\"BJR open\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2021-11-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8611679/pdf/\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"BJR open\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1259/bjro.20210018\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2021/1/1 0:00:00\",\"PubModel\":\"eCollection\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"BJR open","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1259/bjro.20210018","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2021/1/1 0:00:00","PubModel":"eCollection","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
目的:利用压缩感知(CS)和并行成像(PI)技术，在1.5 T MR系统中优化单次屏气下肝脏高时间分辨率磁共振(MR)成像的扫描方案。方法:纳入31名健康志愿者，使用1.5 T MR系统进行脂肪抑制梯度回声t1加权成像。通过改变CS和PI中的各种成像参数来评估图像质量，以便在单次屏气内将扫描时间调整为10秒和6秒。测量肝脏信号强度的归一化标准差(nSD = SD/均值)和信噪比(SNR =均值/SD)。采用4分制评估肝脏轮廓和右肝下静脉(IRHV)的视觉评分，并与参考标准(无CS的20秒扫描)进行比较。结果:CS因子2.0的10 s扫描和CS因子2.0、2.5的6 s扫描与20 s扫描比较，nSD和信噪比无显著差异。CS因子2.0的10 s扫描总体视觉评分(肝脏轮廓和IRHV平均评分)明显优于其他扫描方案(p < 0.05)。结论:在1.5 T MR系统中使用CS和PI对肝脏进行高时间分辨率磁共振成像时，推荐CS因子2.0的10s扫描。知识进展:本研究在1.5 T MR系统中使用CS和PI进行了一种新的肝脏MR成像。
Optimization of scan protocol for high temporal resolution magnetic resonance imaging of the liver under single breath-holding using compressed sensing and parallel imaging techniques in a 1.5-T magnetic resonance system.
Objective: To optimize the scan protocol for high temporal resolution magnetic resonance (MR) imaging of the liver under single breath-holding, using compressed sensing (CS) and parallel imaging (PI) techniques in a 1.5 T MR system.
Methods: 31 healthy volunteers who underwent fat-suppressed gradient-echo T1 weighted imaging using a 1.5 T MR system were included. Image quality was evaluated on altering various imaging parameters in CS and PI so that the scan time was adjusted to 10 and 6 s within a single breath-holding. Normalized standard deviation (nSD = SD/mean value) and signal-to-noise ratio (SNR = mean value/SD) of liver signal intensity were measured. Visual scores for the outline of the liver and inferior right hepatic vein (IRHV) were evaluated using a 4-point scale and compared with that of the reference standard (20 s scan without CS).
Results: The nSD and SNR were not significantly different when the 10 s scan with CS factor 2.0 and the 6 s scan with CS factor 2.0 and 2.5 were compared to the 20 s scan. Overall visual score (mean score of the outline of the liver and IRHV) was significantly better (p < 0.05) with the 10 s scan with CS factor 2.0 compared to the other scan protocols.
Conclusion: The 10 s scan with CS factor 2.0 should be recommended for high temporal resolution MR imaging of the liver using CS and PI in a 1.5 T MR system.
Advances in knowledge: This study conducts a novel MR imaging of the liver using CS and PI in a 1.5 T MR system.
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