Impact of different flip angles on the image quality of female pelvic susceptibility-weighted imaging

Liu Wenjie; Xiao Zhibo; Yu Bin; Liang Kaiwen; Lü Furong

doi:10.13406/j.cnki.cyxb.003849

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Impact of different flip angles on the image quality of female pelvic susceptibility-weighted imaging

Clinical research | 更新时间：2025-12-31

- Impact of different flip angles on the image quality of female pelvic susceptibility-weighted imaging
- Journal of Chongqing Medical University Vol. 50, Issue 12, Pages: 1737-1743(2025)
- 作者机构：
  
  1.重庆医科大学附属第一医院放射科，重庆 400016
  2.重庆医科大学附属第一医院健康管理中心，重庆 400016
- 作者简介：
- 基金信息：
- DOI：10.13406/j.cnki.cyxb.003849
  CLC： R445.2
- Received：15 November 2024，
  
  Revised：2025-02-26，
  
  Accepted：25 March 2025，
  
  Published：28 December 2025
- 稿件说明：
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刘文杰,肖智博,郁斌等.不同翻转角对女性盆腔磁敏感加权成像图像质量的影响[J].重庆医科大学学报,2025,50(12):1737-1743.

Liu Wenjie,Xiao Zhibo,Yu Bin,et al.Impact of different flip angles on the image quality of female pelvic susceptibility-weighted imaging[J].Journal of Chongqing Medical University,2025,50(12):1737-1743.
刘文杰,肖智博,郁斌等.不同翻转角对女性盆腔磁敏感加权成像图像质量的影响[J].重庆医科大学学报,2025,50(12):1737-1743. DOI： 10.13406/j.cnki.cyxb.003849.

Liu Wenjie,Xiao Zhibo,Yu Bin,et al.Impact of different flip angles on the image quality of female pelvic susceptibility-weighted imaging[J].Journal of Chongqing Medical University,2025,50(12):1737-1743. DOI： 10.13406/j.cnki.cyxb.003849.

摘要

目的

探讨不同翻转角（flip angle，FA）对女性盆腔磁敏感加权成像（susceptibility-weighted imaging，SWI）图像质量的影响。

方法

纳入44例行盆腔MRI增强的患者。测量各组病变、子宫及臀大肌的信号强度（signal intensity，SI）、标准差（standard deviation，SD），计算信噪比（signal to noise ratio，SNR）、对比噪声比（contrast to noise ratio，CNR）；采用4分法对盆腔各部位的解剖细节显示、几何畸形程度、伪影和病灶清晰度进行主观评价；采用非参数Friedman检验进行SNR、CNR及主观评分多组间比较，采用LSD-

检验进行各组SNR、CNR及主观评分的事后组内两两比较，对结果进行Bonferroni 校正。使用组内相关系数（i

ntra-class correlation coefficient，ICC）检验2名观察者对客观评分和主观评分的一致性。

结果

2名观察者除了FA=15°、20°的几何畸形程度一致性尚可外（ICC=0.75），其余各组主观评分的一致性均良好（ICC均

0.75）。FA10°组的SNR

病变、臀大肌、子宫

最高（132.33±34.15、61.90±15.41、103.89±22.48），与FA15°组和FA20°组的组间差异具有统计学意义（

0.001）；FA10°组的CNR

病变

最高（69.67±29.15），与FA15°组和FA20°组的组间差异具有统计学差异（

0.001）。

结论

降低FA是可以明显提高女性盆腔的图像对比度；当FA=10°时，能够提高女性SWI图像质量，可作为临床女性盆腔SWI成像扫描参数设置的优选方案。

Abstract

Objective

To investigate the impact of flip angle （FA） on the image quality of female pelvic susceptibility-weighted imaging（SWI）.

Methods

A total of 44 patients undergoing contrast-enhanced pelvic MRI were enrolled in this study. The signal intensity and standard deviation of lesion，uterus，and gluteus maximus were measured for each group，and signal-to-noise ratio（SNR） and contrast-to-noise ratio（CNR） were calculated. The 4-point method was used to perform subjective evaluation of anatomical details，the degree of geometric deformation，artifacts，and the clarity of lesions in each part of the pelvic cavity. The non-parametric Friedman test was used for comparison of SNR，CNR，and subjective scores between groups，and the least significant difference

-test was used for post-hoc comparison of SNR，CNR，and subjective scores between groups，while Bonferroni correction was performed on the results. The intraclass correlation coefficient（ICC） was used to investigate the consistency in objective and subjective scores between two observers.

Results

There was good consistency in subjective scores the two observers in all groups（ICC

0.75） except for the degree of geometric deformation in the FA=15° and FA=20° groups（ICC=0.75）. The SNR values of lesion，gluteus maximus，and uterus was 132.33±34.15，61.90±15.41，and 103.89±22.48，respectively，in the FA=10° group，with sig

nificant differences compared with the FA=15° and FA=20° groups（

0.001）. The FA=10° group had the highest CNR value of lesion（69.67±29.15），with significant differences compared with the FA=15° and FA=20° groups（

0.001）.

Conclusion

Reducing FA can significantly improve the contrast of female pelvic images，and the SWI image quality of female pelvic cavity can be improved at an FA of10°，which can be used as the optimal regimen for setting parameters for female pelvic SWI imaging in clinical practice.

关键词

Keywords

references

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