Figure 1. Explanation of the radiation treatments during the early IMRT adoption period (period 1) and the early SBRT adoption period (period 2).
IMRT is the new treatment in period 1; SBRT is the new treatment in period 2. The total proportion of treatments during each treatment period is 100%.
*During the early SBRT adoption period, IMRT was considered a standard radiation treatment since it was the most common radiation treatment used for prostate cancer at that time.
Abbreviations: IMRT; intensity-modulated radiotherapy; SBRT, stereotactic body radiation treatment