What does TAR stand for in radiotherapy planned methods?

Tissue Air Ratio (TAR) is a crucial concept in radiotherapy, particularly in the context of calculating the dose distribution for treatment planning. TAR refers to the ratio of the dose of radiation delivered to a specific tissue compared to the dose delivered to air at a defined depth under similar irradiation conditions. This measurement is essential for understanding how the dose is modified by different tissue types and densities when planning radiation treatments.

In clinical practice, TAR is used to help determine the amount of radiation that each tissue region will receive. The understanding of TAR aids dosimetrists in adjusting treatment plans to account for variations in tissue composition, ensuring that the desired dose is accurately delivered to the tumor while minimizing exposure to surrounding healthy tissues.

The other options do not accurately describe this important parameter in radiotherapy. While they may pertain to concepts in medical physics, they do not relate specifically to the methods and calculations employed for effective dose delivery in radiotherapy planning.