Related Experiment Video
Updated: Nov 22, 2025
Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
Published on: April 17, 2019
Deformation of the Pelvic Arteries Caused by Pneumoperitoneum and Postural Changes in an Animal Model
Hidemichi Kiyomatsu1, Lei Ma2, Junchen Wang3
1Department of Surgical Oncology, Faculty of Medicine, The University of Tokyo, Tokyo, Japan; kiyomatsu71@yahoo.co.jp.
Background/Aim:
We investigated pelvic arterial deformation and shift due to intraoperative pneumoperitoneum and postural changes in an animal model.
Materials And Methods:
Computed tomography images of pigs were acquired in different body positions (supine, head down at 5° and 10°, right lateral recumbent at 5° and 15°) before and after insufflation. We used a free software (3D Slicer) for image analysis. After landmark registration using 10 markers inserted into the pelvis, pelvic arterial deformation and shift of seven arterial bifurcation points were evaluated. The distance moved was the target registration error (TRE) from the points registered in the supine position. Fiducial registration error (FRE) was measured using the 10 pelvic markers.
Results:
TRE average from postural changes ranged from 0.7 to 1.2 mm and was 1.4 mm due to pneumoperitoneum. TRE and FRE averages were 2.1 mm and 0.2 mm, respectively.
Conclusion:
The pelvis was useful for registering anatomical landmarks.
