Welcome back to the RadOnc Smart Review Physics Series! In P9, we mastered the art of calibration using TG-51, linking machine output (MU) to absolute dose under reference conditions. But patients aren't water phantoms treated at 10 cm depth with a 10x10 field! So, how does dose actually distribute within a patient? In Episode P10: External Beam Dose Descriptors (Part 1), we begin our dive into Chapter 12, focusing on key concepts like electron buildup, dmax, Percent Depth Dose (PDD), and the family of Tissue-Air/Phantom/Maximum Ratios (TAR, TPR, TMR) used to characterize dose distribution.
