What range of kilovolts is typical for the operation of orthovoltage machines?

Orthovoltage machines are designed to operate within a specific range of kilovoltage to effectively deliver radiation therapy treatments, particularly for superficial tumors. Typically, these machines function within the range of 150 to 500 kilovolts. This range is significant because it allows the machines to penetrate various tissue depths while still ensuring adequate dose distribution to the targeted areas.

Using kilovoltage in this range contributes to the treatment’s effectiveness, particularly for tumors that are not located deep within the body. The higher energy levels within the specified range also enable better sparing of surrounding healthy tissues, making the treatment safer and more focused on the tumor itself.

In contrast, the other options fall outside the operational characteristics of orthovoltage machines, with options representing either lower ranges or single values that do not encompass the functionality required. Specifically, lower energy ranges would not suffice for penetrating treatment depths, and therefore do not align with the intended use of orthovoltage techniques.