Postediting prostate magnetic resonance imaging segmentation consistency and operator time using manual and computer-assisted segmentation: multiobserver study

Maysam Shahedi; Derek W. Cool; Cesare Romagnoli; Glenn S. Bauman; Matthew Bastian-Jordan; George Rodrigues; Belal Ahmad; Michael Lock; Aaron Fenster; Aaron D. Ward

doi:10.1117/1.JMI.3.4.046002

7 November 2016 Postediting prostate magnetic resonance imaging segmentation consistency and operator time using manual and computer-assisted segmentation: multiobserver study

Maysam Shahedi, Derek W. Cool, Cesare Romagnoli, Glenn S. Bauman, Matthew Bastian-Jordan, George Rodrigues, Belal Ahmad, Michael Lock, Aaron Fenster, Aaron D. Ward

Author Affiliations +

Journal of Medical Imaging, Vol. 3, Issue 4, 046002 (November 2016). https://doi.org/10.1117/1.JMI.3.4.046002

Abstract

Prostate segmentation on T2w MRI is important for several diagnostic and therapeutic procedures for prostate cancer. Manual segmentation is time-consuming, labor-intensive, and subject to high interobserver variability. This study investigated the suitability of computer-assisted segmentation algorithms for clinical translation, based on measurements of interoperator variability and measurements of the editing time required to yield clinically acceptable segmentations. A multioperator pilot study was performed under three pre- and postediting conditions: manual, semiautomatic, and automatic segmentation. We recorded the required editing time for each segmentation and measured the editing magnitude based on five different spatial metrics. We recorded average editing times of 213, 328, and 393 s for manual, semiautomatic, and automatic segmentation respectively, while an average fully manual segmentation time of 564 s was recorded. The reduced measured postediting interoperator variability of semiautomatic and automatic segmentations compared to the manual approach indicates the potential of computer-assisted segmentation for generating a clinically acceptable segmentation faster with higher consistency. The lack of strong correlation between editing time and the values of typically used error metrics (ρ<0.5) implies that the necessary postsegmentation editing time needs to be measured directly in order to evaluate an algorithm’s suitability for clinical translation.

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Maysam Shahedi, Derek W. Cool, Cesare Romagnoli, Glenn S. Bauman, Matthew Bastian-Jordan, George Rodrigues, Belal Ahmad, Michael Lock, Aaron Fenster, and Aaron D. Ward "Postediting prostate magnetic resonance imaging segmentation consistency and operator time using manual and computer-assisted segmentation: multiobserver study," Journal of Medical Imaging 3(4), 046002 (7 November 2016). https://doi.org/10.1117/1.JMI.3.4.046002

Published: 7 November 2016

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