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. 2022 Sep 30;40(3):200–207. doi: 10.3857/roj.2022.00339

Fig. 2.

Fig. 2.

Axial views of the US-based trans-rectal HDRBT and SBRT plans with overlaid dose distribution. (A) Axial view of the US-based HDRB plan. Red line indicates contour of prostate; dark blue line, contour of anterior rectal wall; yellow line, 100% isodose; light cyan line, 80% isodose (white arrow); dark cyan line, 50% isodose (yellow arrow). Only 50% isodose cross small volume of anterior rectal wall. (B) Axial CT-MRI fused image of the prostate with one visualized fiducial in the right lobe. Treatment plan of the prostate SBRT. Red line indicates prostate and CTV contours; magenta line, contour of the rectum; green line, 100% isodose; dark blue line, 80% isodose (white arrow); cyan line, 50% isodose (yellow arrow). Half of the rectum volume is covered by 50% isodose, the whole anterior rectum wall is covered by 80% isodose, 100% isodose “touch” anterior rectal wall. SBRT, stereotactic body radiotherapy; HDRB, high dose rate brachytherapy; US, ultrasound; CT, computerized tomography; MRI, magnetic resonance tomography.