Table 1.

Summary of the contents of the questionnaire for prostate IMRT

1. State of implementation of prostate IMRT Time of commencement at institution Number of cases treated Stage of indication and exclusion criteria

2. Equipment and beam delivery methods Treatment machine and planning system Beam delivery method and energy Patient fixation and error reduction strategy

3. Treatment planning Definitions of CTV and PTV Dose prescription Definitions of the organs at risk

4. Dose-volume data of five typical cases CTV (D95, mean dose, maximum dose) PTV (D95, mean dose, maximum dose, V90)

IMRT, intensity-modulated radiation therapy; CTV, clinical target volume; PTV, planning target volume; D95, the percentage of the prescribed dose covering 95% of the volume; V90, the percentage of the volume covered by 90% of the prescribed dose.