Department of Radiology, Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou, Guangdong Province, China.
School of Medicine, South China University of Technology, Guangzhou, Guangdong Province, China.
BMC Med Imaging. 2023 Jan 25;23(1):14. doi: 10.1186/s12880-023-00969-9.
The aim was to compare the diffusion tensor imaging (DTI) indices derived from human hearts between 1.5 T and 3.0 T scanners. Additionally, the reproducibility of DTI indices was assessed between 1.5 T and 3.0 T scanners.
A total of 18 ex-vivo hearts were derived from patients who underwent heart transplantation. The DTI schemes were performed at 1.5 T and 3.0 T, respectively. Then, the same slices from each ex-vivo heart were selected for image analysis. The student's t-test or Wilcoxon-rank test was used to compare the statistical differences. The agreement of DTI indices was mainly reported as the interclass correlation coefficient (ICC).
No significant differences (all P > 0.05) were found in the DTI indices between 1.5 T and 3.0 T scanners. Interestingly, the ICC of all DTI indices was relatively lower with a low b-value. The reproducibility of the helix angle (HA) was relatively lower when compared to the other DTI indices.
The DTI indices of ex-vivo human hearts between 1.5 T and 3.0 T scanners had no significant differences. The consistency of DTI indices needed caution using a low b-value with different field strengths, and the relatively low reproducibility of HA should be considered.
本研究旨在比较 1.5T 和 3.0T 扫描仪获取的人心扩散张量成像（DTI）指标，并评估不同场强扫描仪间 DTI 指标的可重复性。
共 18 例来自心脏移植患者的离体心脏用于本研究。分别在 1.5T 和 3.0T 扫描仪上进行 DTI 方案。然后，从每个离体心脏中选择相同的切片进行图像分析。采用学生 t 检验或 Wilcoxon 秩检验比较统计学差异。DTI 指标的一致性主要以组内相关系数（ICC）表示。
1.5T 和 3.0T 扫描仪间 DTI 指标无显著差异（均 P>0.05）。有趣的是，低 b 值时所有 DTI 指标的 ICC 相对较低。与其他 DTI 指标相比，螺旋角（HA）的可重复性相对较低。
1.5T 和 3.0T 扫描仪获取的离体人心 DTI 指标无显著差异。使用不同场强的低 b 值时，DTI 指标的一致性需要谨慎，HA 的可重复性相对较低应加以考虑。
