Nardos Rahel, Thurmond Amy S, Worstell Teresa R, Clark Amanda L, Gregory W Thomas
Female Pelvic Med Reconstr Surg. 2010 Jul;16(4):242-5. doi: 10.1097/SPV.0b013e3181ec2070.
: To compare the variability in two commonly used reference lines in pelvic magnetic resonance imaging (MRI), the pubococcygeal line (PCL) and the sacrococcygeal to inferior pubis (SCIPP) line, with respect to their distance from pelvic floor points of interest.
: We obtained pelvic MR images of 20 asymptomatic nulliparous women who are part of an ongoing pelvic floor nerve injury postpartum study. The subjects underwent a high-resolution two-dimensional, T2-weighted sagittal pelvic MRI in the supine position using a GE Signa scanner with a body phased-array coil. We also obtained dynamic T2-weighted sagittal MR images in supine position during Kegel and Valsalva maneuvers. Using the midsagittal image, we measured the length of two reference lines: the PCL and the more cephalad SCIPP line. From each line, we then measured the perpendicular distance to the bladder neck and to the posterior margin of the anorectal angle (M-line). We compared the mean values of all measurements between the two reference lines with paired Student t tests.
: The SCIPP line (mean [SD], 11.60 [0.91] cm) is longer than the PCL (mean [SD], 10.54 [0.85] cm) at rest (P < 0.001). There is no significant change in length from resting to Kegel maneuver or from resting to Valsalva maneuver in either reference line. Only the resting to Valsalva maneuver for the M-line was significantly different between the 2 reference lines (P = 0.02). The resting to Kegel for the perpendicular distance to the bladder neck and the M-line was not significantly different between the two lines.
: Both reference lines remain stable during pelvic floor maneuvers.
比较盆腔磁共振成像（MRI）中两条常用参考线，即耻骨尾骨线（PCL）和骶尾至耻骨下（SCIPP）线，与盆底感兴趣点之间距离的变异性。
我们获取了20名无症状未生育女性的盆腔MR图像，这些女性是正在进行的产后盆底神经损伤研究的一部分。受试者在仰卧位使用配备体部相控阵线圈的GE Signa扫描仪进行高分辨率二维T2加权矢状位盆腔MRI检查。我们还在仰卧位进行凯格尔运动和瓦尔萨尔瓦动作期间获取了动态T2加权矢状位MR图像。利用正中矢状位图像，我们测量了两条参考线的长度：PCL和更靠头侧的SCIPP线。然后从每条线测量到膀胱颈和肛管直肠角后缘（M线）的垂直距离。我们使用配对学生t检验比较两条参考线之间所有测量值的平均值。
静息状态下，SCIPP线（平均值[标准差]，11.60[0.91]cm）比PCL线（平均值[标准差]，10.54[0.85]cm）长（P<0.001）。两条参考线从静息状态到凯格尔运动或从静息状态到瓦尔萨尔瓦动作时长度均无显著变化。仅M线从静息状态到瓦尔萨尔瓦动作在两条参考线之间有显著差异（P = 0.02）。两条线到膀胱颈和M线的垂直距离从静息状态到凯格尔运动时无显著差异。
在盆底运动过程中，两条参考线均保持稳定。
