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Figure 2. Dose distributions for a central slice of a typical patient: (a) the intensity-modulated radiation therapy (IMRT) simultaneous boost technique—isodoses represent 95% of the prescribed planning target volume (PTV) dose (50 Gy) and 95% of the prostate boost dose (57 Gy); (b) phase 1 of the 3D conformal radiotherapy (3DCRT) sequential boost technique (isodose 95% of 48 Gy PTV dose); (c) phase 2 of the 3DCRT technique (isodose 95% of 9 Gy boost volume dose). In all cases the contours outlined are the clinical target volume (CTV) (at this level CTV1=CTV2), PTV, bladder (bl) and rectum (rec).
