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Two treatment plans for the treatment of a breast cancer are created. Compare the V20 of the heart in the DVHs for the two different treatment plans below. Considering the V20 of the heart only, which plan is more optimal and why? Plan 1: The heart is represented by purple on the DVH.             Plan 2: The heart is represented by red on the DVH.

The _______________ in a linear accelerator increases the uniformity of the intensity of an xray beam.

A patient has a Karnofski Performance Score of 70. Which of the following best describes the patient condition? The patient:

Which of the following is a function of the light field of a linear accelerator? I. Indicate the size of the treatment field II. Provide the proper centering for the beam III. Indicate the correct shape of the treatment field IV. Indicate the extent of the tumor volume

Symptoms of wheezing, dyspnea, and stridor in a patient with a neoplasm of the head and neck is most often the result of:

When treating a patient with a large field size, what implication does the increased PDD (compared to smaller fields) have for dose distribution?

Which of the following neoplasms is most likely benign?

A point source delivers an exposure rate of 120 mR/hr at 80 cm. What will the exposure rate be at 160 cm?

Which services may generate professional charges? A. Initial consultation B. Treatment verification/image review C. Treatment delivery D. Weekly on-treatment management E. Treatment device fabrication

Which standard ensures that medical images and associated information can be consistently stored, transmitted, and interpreted across different imaging and treatment systems?