Comparison of imaging quality for Dixon and Fat ⁃Sat techniques in orbital T2⁃ weighted imaging
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摘要:
目的：对比 Dixon 和频率选择脂肪预饱和(frequency-selective fat-saturation，Fat-Sat)技术对眼眶 T2 加权成像(T2- weighted imaging，T2WI)的压脂效果和综合图像质量。方法：前瞻性纳入35例健康受试者，进行眼眶Dixon-T2WI(Dixon组)和 Fat-Sat-T2WI(Fat-Sat组)扫描。对两组图像的脂肪抑制效果和综合图像质量进行主观评分。基于两组图像分别测量眼外肌和颞肌的信号强度，并计算信号强度比(signal intensity ratio，SIR)。采用Wilcoxon检验对两组图像主观评分进行比较。采用配对样本 t 检验对信号强度和 SIR 进行组间比较。结果：Dixon 组的脂肪抑制效果高于 Fat-Sat 组(3.86±0.36 vs. 2.91±0.56，P ＜ 0.001)，综合图像质量也高于Fat-Sat组(3.83±0.38 vs. 3.26±0.56，P ＜ 0.001)。Dixon组眼外肌信号强度高于Fat-Sat组(362.33± 107.73 vs. 286.59±78.84，P ＜ 0.001)，颞肌信号强度也高于Fat-Sat组(207.26±63.41 vs. 170.19±51.93，P ＜ 0.001)，而两组图像的 SIR差异无统计学意义(1.83±0.54 vs. 1.77±0.49，P=0.239)。结论：与Fat-Sat技术比较，基于Dixon技术的眼眶T2WI压脂效果和图像质量更优，而SIR相仿，可以为临床提供更可靠的诊断依据。
Abstract:
Objective：To compare the fat suppression effect and imaging quality of Dixon and frequency-selective fat-saturation(Fat- Sat)techniques in orbital T2-weighted imaging(T2WI). Methods：Thirty-five healthy subjects were enrolled，with both orbital Dixon- T2WI(Dixon group)and Fat-Sat-T2WI(Fat-Sat group)scans. The fat suppression effect and overall imaging quality for the two groups were scored. The signal intensity of extraocular muscle and ipsilateral temporal muscle，as well as their signal intensity ratio(SIR)were quantitatively measured. Wilcoxon signed rank test were used to compare the subjective scores between groups. Paired -sample t test were used to compare the signal intensity and SIR between groups. Results：Dixon - T2WI had significantly higher scores of fat suppression effect(3.86±0.36 vs. 2.91±0.56，P ＜ 0.001)and overall imaging quality(3.83±0.38 vs. 3.26±0.56，P ＜ 0.001)as compared to Fat - Sat -T2WI. Dixon -T2WI generated both higher signal intensity of extraocular muscle(362.33±107.73 vs. 286.59±78.84，P ＜ 0.001)and ipsilateral temporal muscle(207.26 ± 63.41 vs. 170.19 ± 51.93，P ＜ 0.001)than Fat - Sat - T2WI. However，there was no significant difference in their SIR between the two groups(1.83±0.54 vs. 1.77±0.49，P=0.239). Conclusion：Dixon-T2WI outperforms Fat-Sat-T2WI in both fat suppression effect and overall imaging quality，without significantly altered SIR. This technique can provide a more reliable diagnosis basis for clinic.
