What is the range of collimator diameters used in gamma knife radiosurgery?

The range of collimator diameters used in gamma knife radiosurgery is typically between 4 mm and 18 mm. This range is specifically designed to allow for precise targeting of tumors or lesions while minimizing damage to surrounding healthy tissue. The smaller collimator diameters (like 4 mm) provide high precision for small lesions, while larger diameters (up to 18 mm) can be utilized for larger targets, allowing for flexibility in treatment planning based on the size and location of the lesion being treated.

The selection of the appropriate collimator size is critical in gamma knife procedures as it affects the dose distribution and the conformity of the radiation dose to the target volume. Each collimator size corresponds to a specific level of radiation penumbra and spatial accuracy, which helps in achieving optimal treatment outcomes. Thus, using the correct range of collimators is essential in maximizing the effectiveness of the treatment while reducing potential side effects.