Interobserver and sequence variability in the delineation of pelvic organs at risk on magnetic resonance images.

ABSTRACT:

Background

This study evaluates the contouring variability among observers using MR images reconstructed by different sequences and quantifies the differences of automatic segmentation models for different sequences.

Patients and methods

Eighty-three patients with pelvic tumors underwent T1-weighted image (T1WI), contrast enhanced Dixon T1-weighted (T1dixonc), and T2-weighted image (T2WI) MR imaging on a simulator. Two observers performed manual delineation of the bladder, anal canal, rectum, and femoral heads on all images. Contour differences were used to analyze the interobserver and intersequence variability. A single-sequence automatic segmentation network was established using the U-Net network, and the segmentation results were analyzed.

Results

Variability ana

SUBMITTER: Zheng W 

PROVIDER: S-EPMC11867573 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature