What is the purpose of isodose in radiation oncology?

The purpose of isodose in radiation oncology is to plot lines of equal radiation dose distribution. This practice is essential in treatment planning, as it allows oncologists to visualize how radiation will be delivered to the target tumor compared to surrounding healthy tissue. By plotting isodose lines, clinicians can ensure that an adequate dose is delivered to the tumor while minimizing exposure to adjacent normal tissues, thus optimizing the effectiveness of the treatment while reducing potential side effects.

Understanding isodose distributions is crucial for determining the appropriate angles and intensities of radiation beams, which can vary depending on the patient's anatomy and the specific cancer being treated. This careful planning helps improve the outcomes of radiation therapy, ensuring that the treatment is both safe and effective. The other choices involve concepts that are outside the direct application of isodose lines in radiation treatment planning.