Urethra contouring on computed tomography urethrogram versus magnetic resonance imaging for stereotactic body radiotherapy in prostate cancer

Wee Loon Ong; M Allan Hupman; Melanie Davidson; Mark Ruschin; Jay Detsky; Stanley Liu; Danny Vesprini; Andrew Loblaw

doi:10.1016/j.ctro.2023.100722

Urethra contouring on computed tomography urethrogram versus magnetic resonance imaging for stereotactic body radiotherapy in prostate cancer

Clin Transl Radiat Oncol. 2023 Dec 30:45:100722. doi: 10.1016/j.ctro.2023.100722. eCollection 2024 Mar.

Authors

Wee Loon Ong^{1

2

3}, M Allan Hupman^{1

2}, Melanie Davidson^{1

2}, Mark Ruschin^{1

2}, Jay Detsky^{1

2}, Stanley Liu^{1

2}, Danny Vesprini^{1

2}, Andrew Loblaw^{1

2

4}

Affiliations

¹ Odette Cancer Centre, Sunnybrook Health Sciences Centre, Toronto, Canada.
² Department of Radiation Oncology, University of Toronto, Canada.
³ Alfred Health Radiation Oncology, Monash University, Melbourne, Australia.
⁴ Department of Health Policy, Measurement and Evaluation, University of Toronto, Canada.

Abstract

Accurate urethra contouring is critical in prostate SBRT. We compared urethra contouring on CT-urethrogram and T2-weighted MRI. The dice similarity coefficient, Jaccard index, Hausdorff distance and mean distance to agreement were evaluated. All four metrics indicate better agreement and less variability in urethra contouring on CT-urethrogram, compared to T2-weighted MRI.

Keywords: MRI sequences; Prostate SBRT; Urethra contour; Urethrogram.