In conformal radiation treatment of the prostate, the four field box many years.

Question

In conformal radiation treatment of the prostate, the four field box many years. IMRT treatments of the prostate are now common because of: A. better tumor control B faster treatment times C. less rectal toxicity The implementation of a stereotactic radiosurgery program requires all of the following A. specialized treatment equipment B. specialized photon energies C. specialized quality assurance protocols D. specialized immobilization devices E. specialized CTV-PTV margins When an HDR planning system uses optimization to create a homogeneous dose along the surface of a cylinder applicator, the dwell times will be: A. Higher at the ends than in the center B. Higher in the center than at the ends C. All approximately equal D. Alternately high and low E. All of the above Pd-103 is favored over I-125 for permanent breast implants because: A. The initial dose rate is lower B. The half-life is shorter. C. The time taken to deliver 90% of the total dose is longer D. The initial activity is lower E. All of the above

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