Influence of ultrasound focus depth on the association between echo intensity and intramuscular adipose tissue
Influence of ultrasound focus depth on the association between echo intensity and intramuscular adipose tissue
复制标题
DOI：
10.1002/mus.27677
复制
发表时间：
2022-09-02
期刊：
影响因子：
3.4
通讯作者：
Ichihashi, Noriaki
中科院分区：
文献类型：
--
作者：
Fukumoto, Yoshihiro;Taniguchi, Masashi;Ichihashi, Noriaki
简介/目标 超声波 (US) 的衰减是 B 模式 US 回波强度 (EI) 的严重限制。本研究的目的是确定 US 图像的焦深是否影响 EI 的深度依赖性衰减以及 EI 与肌内脂肪组织 (IntraMAT) 之间的关系。方法 对 135 名成人（92 名老年，43 名年轻）的右大腿股直肌 (RF) 和股中间肌 (VI) 进行研究。 US 图像上的 EI 在三种聚焦深度条件下测量：图像顶部、RF 中心和 VI 中心。测量感兴趣区域 (ROI) 的深度。 IntraMAT 是使用基于两点 Dixon 技术和 3.0-T 磁共振成像扫描仪的水和脂肪图像计算的。结果 EI 和 IntraMAT 之间的相关性在焦点 RF 和 VI 条件下比在焦点顶部条件下更强，并且 RF 比 VI 更强。与焦点 RF 和 VI 条件相比，ROI 深度在焦点顶部条件下对 IntraMAT 调整的残余 EI 的影响更大，并且对 VI 的影响比对 RF 的影响更大。讨论 通过减轻 EI 衰减，将聚焦深度调整为 ROI 的 EI 比未调整的 EI 更准确地反映 IntraMAT。然而，它可能无法完全防止 EI 深度依赖性衰减的潜在影响，尤其是对于 VI 等更深的肌肉。
Introduction/Aims Attenuation of the ultrasound (US) wave is a serious limitation of echo intensity (EI) on B-mode US. The aim of this study was to determine whether the focus depth of US images influences the depth-dependent attenuation of EI and the relationship between EI and intramuscular adipose tissues (IntraMAT). Methods The rectus femoris (RF) and vastus intermedius (VI) of the right thigh were studied in 135 adults (92 older, 43 younger). The EI on US images was measured at three focus depth conditions: top of the image, center of the RF, and center of the VI. The depth of the region of interest (ROI) was measured. IntraMAT was calculated using water and fat images based on the two-point Dixon technique with a 3.0-T magnetic resonance imaging scanner. Results The correlation between EI and IntraMAT was stronger in the focus RF and VI conditions than in the focus top condition and stronger for RF than for VI. The depth of the ROI influenced the IntraMAT-adjusted residual EI more in the focus top condition than in the focus RF and VI conditions, and influenced VI more strongly than it did RF. Discussion By mitigating EI attenuation, EI with a focus depth adjusted to the ROI reflected IntraMAT more accurately than that without adjustment. However, it may not completely prevent the potential influence of depth-dependent attenuation of EI, especially for deeper muscles such as the VI.