V75 (radiation dose)

V75 in radiation therapy refers to the volume percentage of an organ or tissue that receives at least 75% of the prescribed radiation dose during treatment. For example, if V75 for the lung is 10%, it means that 10% of the lung volume gets 75% or more of the planned radiation dose. This metric helps clinicians assess and limit radiation exposure to healthy tissues, minimizing potential side effects while effectively targeting the treatment area. It’s an important parameter in treatment planning to balance maximizing tumor control with preserving organ function.