Author: Anonymous

Which of the following statements best defines the ICRU 50 definition of target volumes

In most cases, cancers of the rectum have a histological pathology of

If a therapist is receiving a dose of radiation that measures 12.7 mRem at a distance of 88 centimeters from the source. At what distance would the therapist need be in order to reduce the exposure to 4.5 mRem?   

A patient is being treated isocentrically for cervical cancer. The patient is in the 3rd week of treatment.  The patient is being treated on a machine that is calibrated at 100 SSD.  The tumor is 9.2 cm below the anterior surface of the patient.  The tumor is also located 10.2 cm medial from the patient’s left side. The patient is 26.4 cm thick (AP/PA) and from right to left lateral the patient is 34.6cm.  The doctor prescribes a total dose of 64.8 Gy to be delivered in fractions of 1.8 Gy.  The patient is being treated using a four field box technique. What is the PA SSD?  

Daily quality assurance on the linear accelerator is divided into the following three categories:

Localizing lasers in the simulation room and the linear accelerator must be within _____________ of the isocenter.

Medical accelerator hazards, which cause the dose to be delivered to the wrong area are caused by all of the following except

Field size

One of the primary reasons that patients are permanently marked in radiation therapy is to help indicate

Patient evaluation during treatment in the radiation therapy process is the responsibility of the 1. Dosimetrist 2. Radiation therapist 3. Physicist 4. Oncology nurse 5. Radiation oncologist