Abstract

Purpose: MRI improves the definition of the prostate compared to CT. However, radiotherapy plans based on MRI are still subject to interobserver variability (IoV) from human readers. Human IoV can lead to significant plan variability and inadequacy. The purpose of this study was to quantify the IoV in delineating the prostate, external urinary sphincter (EUS), seminal vesicles (SV), rectum, and bladder in prostate MRIs acquired for treatment planning and postimplant assessment of low-dose-rate prostate brachytherapy (LDRPBT).

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