What is the most common pathology of malignant tumors of the prostate?

The laryngopharynx continues inferiorly as the

The treatment head of a linear accelerator includes all of the following EXCEPT:

The paranasal sinuses are lined with                           

Identify the indicated structure.    

What structure is indicated?    

A radioactive isotope that would be prescribed for a metastatic bone study in a prostate patient is

What is the principal advantage of isocentric technique over non-isocentric source to surface distance techniques for a treatment using parallel opposed treatment portals?

Your patient is being treated supine using AP/PA ports. The dosimetrist asks you to make an anterior shift on the PA port of 1 cm. Which of the following is true?

A urinary bladder patient is being treated with an isocentric four-field box portal plan on a linear accelerator calibrated to 100 cm SAD . The AP/PA separation is 25.3 cm. The RT/LT lateral separation is 36.9 cm. The isocenter of the planned target volume is located at a depth of 18.7 cm from the anterior aspect of the patient and midline from the right and left lateral aspect of the patient. The treatment portal for the AP and PA portals are 7.2 cm x 9.8 cm to mirror each other. What would be the field size on the patient’s posterior skin surface?