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第42卷第12期 南京医科大学学报（自然科学版）
2022年12月 Journal of Nanjing Medical University（Natural Sciences） ·1741 ·

·临床研究·

Dixon与Fat⁃Sat技术在眼眶T2加权成像中的图像质量对比研究

刘王琰，陈 露，胡 昊，刘 俊 *
南京医科大学第一附属医院放射科，江苏 南京 210029

［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。
［关键词］ 眼眶；磁共振成像；脂肪抑制；Dixon
［中图分类号］ R445.2 ［文献标志码］ A ［文章编号］ 1007⁃4368（2022）12⁃1741⁃04
doi：10.7655/NYDXBNS20221216

Comparison of imaging quality for Dixon and Fat⁃Sat techniques in orbital T2⁃weighted

imaging
LIU Wangyan，CHEN Lu，HU Hao，LIU Jun *
Department of Radiology，the First Affiliated Hospital of Nanjing Medical University，Nanjing 210029，China

［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.
［Key words］ orbit；magnetic resonance imaging；fat suppression；Dixon
［J Nanjing Med Univ，2022，42（12）：1741⁃1744］

［基金项目］ 国家自然科学基金青年基金项目（81801659）
∗
通信作者（Corresponding author），E⁃mail：liujun@jsph.org.cn