A flat piece of lead with a central opening that determines the size and shape of the beam is a(n):
collimator
extension cone
aperture diaphragm
wedge filter
aperture diaphragm
Rationale: Aperture diaphragms provide an unexposed border around the periphery of the image. Dedicated chest units apply a fixed aperture diaphragm.
Health Professions
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Which of the following services is NOT a mandatory assignment by Medicare?
a. Laboratory services b. Supplies c. Office visits d. Home dialysis supplies
Health Professions
The killing of pathogenic agents by directly applying a chemical made for that purpose is called:
A) cleaning. B) disinfection. C) sterilization. D) high-level disinfection.
Health Professions