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The urethral position may shift due to urethral catheter placement in the treatment planning for prostate radiation therapy.
- Source :
- Radiation Oncology; 12/12/2019, Vol. 14 Issue 1, p1-12, 12p
- Publication Year :
- 2019
-
Abstract
- <bold>Purpose: </bold>To determine the best method to contour the planning organ at risk volume (PRV) for the urethra, this study aimed to investigate the displacement of a Foley catheter in the urethra with a soft and thin guide-wire.<bold>Methods: </bold>For each patient, the study used two sets of computed tomography (CT) images for radiation treatment planning (RT-CT): (1) set with a Foley urethral catheter (4.0 mm diameter) plus a guide-wire (0.46 mm diameter) in the first RT-CT and (2) set with a guide-wire alone in the second CT recorded 2 min after the first RT-CT. Using three fiducial markers in the prostate for image fusion, the displacement between the catheter and the guide-wire in the prostatic urethra was calculated. In 155 consecutive patients treated between 2011 and 2017, 5531 slices of RT-CT were evaluated.<bold>Results: </bold>Assuming that ≥3.0 mm of difference between the catheter and the guide-wire position was a significant displacement, the urethra with the catheter was displaced significantly from the urethra with the guide-wire alone in > 20% of the RT-CT slices in 23.2% (36/155) of the patients. The number of patients who showed ≥3.0 mm anterior displacement with the catheter in ≥20% RT-CT slices was significantly larger at the superior segment (38/155) than at the middle (14/155) and inferior segments (18/155) of the prostatic urethra (p < 0.0167).<bold>Conclusions: </bold>The urethral position with a Foley catheter is different from the urethral position with a thin and soft guide-wire in a significant proportion of the patients. This should be taken into account for the PRV of the urethra to ensure precise radiotherapy such as in urethra-sparing radiotherapy. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1748717X
- Volume :
- 14
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Radiation Oncology
- Publication Type :
- Academic Journal
- Accession number :
- 140313253
- Full Text :
- https://doi.org/10.1186/s13014-019-1424-8