Biomedical Applications in Molecular, Structural, and Functional Imaging

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

[+] Author Affiliations
Maysam Shahedi

London Regional Cancer Program, 790 Commissioners Road, London, Ontario N6A 4L6, Canada

University of Western Ontario, Robarts Research Institute, 1151 Richmond Street, London, Ontario N6A 5B7, Canada

University of Western Ontario, Graduate Program in Biomedical Engineering, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

Derek W. Cool

University of Western Ontario, Robarts Research Institute, 1151 Richmond Street, London, Ontario N6A 5B7, Canada

University of Western Ontario, Department of Medical Imaging, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

Cesare Romagnoli, Matthew Bastian-Jordan

University of Western Ontario, Department of Medical Imaging, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

Glenn S. Bauman

London Regional Cancer Program, 790 Commissioners Road, London, Ontario N6A 4L6, Canada

University of Western Ontario, Department of Medical Biophysics, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

University of Western Ontario, Department of Oncology, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

George Rodrigues, Belal Ahmad, Michael Lock

London Regional Cancer Program, 790 Commissioners Road, London, Ontario N6A 4L6, Canada

University of Western Ontario, Department of Oncology, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

Aaron Fenster

University of Western Ontario, Robarts Research Institute, 1151 Richmond Street, London, Ontario N6A 5B7, Canada

University of Western Ontario, Graduate Program in Biomedical Engineering, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

University of Western Ontario, Department of Medical Imaging, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

University of Western Ontario, Department of Medical Biophysics, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

Aaron D. Ward

London Regional Cancer Program, 790 Commissioners Road, London, Ontario N6A 4L6, Canada

University of Western Ontario, Graduate Program in Biomedical Engineering, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

University of Western Ontario, Department of Medical Biophysics, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

University of Western Ontario, Department of Oncology, 1151 Richmond Street, London, Ontario N6A 3K7, Canada

J. Med. Imag. 3(4), 046002 (Nov 07, 2016). doi:10.1117/1.JMI.3.4.046002
History: Received July 12, 2016; Accepted September 19, 2016
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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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Citation

Maysam Shahedi ; Derek W. Cool ; Cesare Romagnoli ; Glenn S. Bauman ; Matthew Bastian-Jordan, et al.
"Postediting prostate magnetic resonance imaging segmentation consistency and operator time using manual and computer-assisted segmentation: multiobserver study", J. Med. Imag. 3(4), 046002 (Nov 07, 2016). ; http://dx.doi.org/10.1117/1.JMI.3.4.046002


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