呼吸间隔和时间分辨率之间的关系对自由呼吸腹部MRI成像中的图像质量的影响
Kazuki Oyama1, Mariko Kurashina2, Fumihito Ichinohe1
1Department of Radiology, Shinshu University School of Medicine, Matsumoto, Nagano, Japan.
概括
较长的时间分辨率 (TR) 提高了自由呼吸腹部MRI (FB-aMRI) 的图像质量,使用金角辐射稀疏平行 (GRASP). 较短的TR导致标准偏差增加和图像质量得分降低.
科学领域:
- 放射学 放射学是一门学科.
- 医疗成像医学成像
- 磁共振成像技术 磁共振成像技术
背景情况:
- 自由呼吸腹部MRI (FB-aMRI) 对于无法屏住呼吸的患者至关重要.
- 金角辐射稀疏平行 (GRASP) 是用于FB-aMRI的一种技术.
- 优化成像参数对于最大限度地提高FB-aMRI中的图像质量至关重要.
研究的目的:
- 调查呼吸间隔 (RI) 和时间分辨率 (TR) 之间的关系对FB-aMRI图像质量的影响.
- 在腹部成像中确定GRASP的最佳TR值.
主要方法:
- 十名健康的志愿者接受了2分钟的脂肪抑制T1加权成像使用GRASP.
- 图像检测是在3秒和5秒的呼吸间隔 (RIs) 进行的.
- 图像以 1.8 秒至 7.7 秒的各种时间分辨率 (TR) 进行了回顾性重建.
- 在隔膜下测量标准偏差 (SD),并由两名放射科医生视觉评估图像质量.
主要成果:
- 与较长的TRs (TR4.8和TR7.7) 相比,较短的TRs (TR1.8和TR2.9) 观察到更高的标准偏差 (SD).
- 与TR4.8和TR7.7.7相比,TR1.8的图像质量得分明显较低.
- 胰腺和左的可视化得分在TR2.9较低,而RI5.5的TR7.7较低.
结论:
- 与RI相对延长TR可以提高使用GRASP的FB-aMRI中的图像质量.
- 在GRASP成像中,建议使用更长的TR来改善腹部结构的可视化和减少人工物.
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