Investigation and analysis of pelvic tilt in MRI examination
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摘要:
目的 探索MRI检查图像患者骨盆倾斜的情况。 方法 回顾性分析2013~2016年因各种妇科疾病行MRI检查的患者，构建骨盆三维模型，通过三维模型的正前面观判定患者骨盆位置是否有倾斜，在二维图像上测量倾斜的角度。 结果 在461例研究对象中，106例（23%）存在骨盆位置的倾斜，主要是左右倾斜，其中向右倾斜28例，偏转（6.28±2.14）°，向左倾斜有78例，偏转（5.88±1.67）°。 结论 常规MRI平卧位检查时存在骨盆倾斜的情况，导致患者正中矢状面选取存在偏差，利用正中矢状面进行的测量就存在偏差，引起骨盆左右倾斜的原因可能与骨盆旋转有关，而利用三维模型测量可以有效避免因骨盆偏斜引起的偏差。 Abstract:Objective To explore the pelvic tilt situation of patients who have done MRI examination. Methods Patients who have performed MRI tests for various gynecological diseases from 2013 to 2016 were included. After we reconstructed 3D model of patient's pelvis based on MRI images, frontal view of the three-dimensional model was used to determine whether the position of the pelvis was tilted or not. The angle of inclination was measured on the two-dimensional image. Results In the 461 subjects, 106 (23%) patients had a tilt pelvic position, mainly left-right tilt type. 28 ones were right tilt with average deflection of (6.28±2.14)°. 78 were leftward tilt with average deflection of (5.88±1.67)°. Conclusions The pelvic tilt in the cross-sectional view of the routine MRI supine test results in deviation of the median sagittal plane of the patient. The pelvic tilt may result from pelvic rotation. The use of three-dimensional model can effectively avoid bias due to pelvic tilt. -
Key words:
- magnetic resonance imaging /
- pelvic organ prolapse /
- pelvic /
- tilt /
- median sagittal plane /
- 3D models
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图 2 体位二维示意图
A: 体位左偏, L-R-P-A:左侧-右侧-后面-前面, 调整后坐标轴在原有坐标轴基础上左偏; B: 体位右偏, L-R-P-A:左侧-右侧-后面-前面, 调整后坐标轴在原有坐标轴基础上右偏; C: 体位正常, L-R-P-A: 左侧-右侧-后面-前面, 调整后坐标轴与原有坐标轴基本重合.
表 1 骨盆不同方向偏转的一般统计情况
患者体位 例数 最大值（°） 最小值（°） 均数±标准差（°） 偏斜 106 10.76 2.39 5.98±1.80 左偏 78 10.76 2.39 5.88±1.67 右偏 28 10.36 3.19 6.28±2.14 
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