Which of the following is an advantage of brachytherapy?
a. It is a treatment option for all lung cancer types.
b. It does not require the use of a broncho-scope.
c. A lower dose of radiation can be delivered to the tumor cells while minimizing radia-tion to the normal tissue.
d. A higher dose of radiation can be deliv-ered to the tumor cells while minimizing radiation to the normal tissue.
ANS: D
The main advantage of brachytherapy is that a higher dose of radiation can be delivered to the tumor cells while minimizing radiation to the normal tissue, thereby reducing complications. Brachytherapy is indicated in patients with inoperable lung cancer or cancer metastatic to the airways.
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The first heart sound (S1) is created primarily by which of the following?
a. Closure of the semilunar valves b. Opening of the semilunar valves c. Opening of the atrioventricular valves d. Closure of the atrioventricular valves