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目的：研究不同回波时间脑池成像序列对面神经与周围血管位置关系的显示效果。方法：回顾性收集2021年3月至2021年7月就诊于北京大学人民医院怀疑面肌痉挛的68例患者，均行磁共振检查，同时扫描回波时间为235 ms的T2加权成像(T2WI)和回波时间为47 ms的质子密度加权成像(PDWI)。测量两种成像不同扫描回波时间图像的面神经、脑桥、血管的信号强度和背景噪声值，计算归一化对比度和对比噪声比。在轴位图像上沿面神经走行进行斜冠状位重建，观察双侧面神经有无血管压迫，记录压迫位置责任血管轮廓显示情况。结果：68例受检者共观察测量136支面神经及临近的脑桥、血管的信号强度和压迫情况。T2WI可见92支面神经血管压迫，PDWI可见96支面神经血管压迫，两种序列比较差异无统计学意义(P=0.125)。在两种成像序列都可见的92支有血管压迫的面神经中，PDWI有83支能显示完整血管轮廓，T2WI有42支，两者比较差异有统计学意义(x2=0.610,P<0.05)。PDWI面神经与血管、脑桥与血管的归一化对比度分别为0.57±0.03和0.43±0.03，均高于T2WI的0.50±0.03和0.24±0.02，差异有统计学意义(t=4.48、7.59,P<0.05)。PDWI和T2WI面神经与血管对比噪声比分别为208.51(112.15～266.17)和162.25(77.00～314.53)，两者比较差异无统计学意义(P=0.452)。脑桥与血管的对比噪声比PDWI为138.24(83.59～197.98)，高于T2WI的34.08(15.92～73.33)，差异有统计学意义(Z=5.677,P<0.05)。结论：在不同回波时间中，较短回波时间的PDWI序列相较于长回波时间的T2WI序列对面神经及周围血管关系的判断具有相同的诊断效果，且PDWI能够更直观地区分血管、神经和脑桥，可以更好地显示血管轮廓。
Abstract：Objective: To investigate the display effects of cisternography imaging sequences of different echo times on the positional relationship between the facial nerve and its surrounding blood vessels. Methods: A total of 68 patients with suspected hemi facial spasm, who underwent magnetic resonance imaging at Peking University People's Hospital from March 2021 to July 2021, were retrospective selected. At the same time, the T2-weighted imaging(T2WI) with an echo time of 235 ms and proton density-weighted imaging(PDWI) with an echo time of 47 ms were selected. The signal intensities and background noise values of the facial nerve, pons and blood vessels of two kinds of images at different echo times were measured, and the normalized contrast and contrast-to-noise ratio were calculated. On the axial images, the oblique coronal reconstructions were performed along the course of the facial nerve, and whether existed compression of blood vessels on both sides of facial nerve was observed. Then, the displayed contours of responsible vessels on the pressed position were recorded. Results: A total of 136 facial nerves and adjacent pons, and single intensity and compression of blood vessels were observed and measured in the 68 subjects. T2WI confirmed 92 cases with compression of blood vessels on the facial nerve, and PDWI confirmed 96 cases with that, and there was not significant difference between two kinds of sequences(P=0.125). In 92 facial nerves with compression of blood vessels, which were confirmed by both two kinds of sequences, PDWI displayed complete vascular contours of 83 facial nerves, and T2WI displayed that of 42 facial nerves, and there was significant differences between them(x2=0.610, P<0.05). The normalized contrasts of PDWI between the facial nerve and blood vessels, and between the pons and blood vessels were respectively 0.57±0.03 and 0.43±0.03, both of which were higher than those(0.50±0.03 and 0.24±0.02) of T2WI, and there were statistically significant differences(t=4.48, 7.59, P<0.05). The contrastto-noise ratios between the facial nerve and blood vessels of PDWI and T2WI were respectively 208.51(112.15–266.17) and 162.25(77.00–314.53), and there was not statistically significant difference(P=0.452). The contrast-to-noise ratio between the pons and blood vessels of PDWI was 138.24(83.59–197.98), which was higher than that [34.08(15.92–73.33) ] of T2WI, and there was a statistically significant difference(Z=5.677, P<0.05). Conclusion: In different echo times, there is same diagnostic effect between the PDWI sequence with shorter echo times and the T2WI sequence with longer echo times in judging the relationship between the facial nerve and surrounding blood vessels. Moreover, PDWI can more intuitively distinguish blood vessels, nerves and pons, which can better display vascular contours.
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基本信息:
中图分类号:R745.12;R445.2
引用信息:
[1]吕高泉,方继侠,张子豪,等.磁共振脑池成像对面肌痉挛神经血管关系的评估：不同回波时间成像对比研究[J].中国医学装备,2026,23(02):23-26+37.
2026-02-25
2026-02-25