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Fig. 4 | Radiation Oncology

Fig. 4

From: The urethral position may shift due to urethral catheter placement in the treatment planning for prostate radiation therapy

Fig. 4

Representative patients with a small and with a large “C-G displacement”. The left image shows the recRT-CT (2) with urethra-G (blue). The middle image shows the fusion image of recRT-CT (1) and recRT-CT (2) with urethra-G (blue) and urethra-C (red). The right image shows the 3D view of urethra-G and urethra-C with the ROI for the prostate (yellow), bladder (blue), and rectum (brown). The broken line (dark blue) shows the height level of the RT-CT slices in the left and middle images. The “C-G displacement” was small throughout the whole prostatic urethra in patient a. On the contrary, the “C-G’ displacement” was apparent at the middle and large at the superior segment in Patient b

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