What measure is used to describe the variability of particle diameters in an aerosol?

a. MMVC
b. LSD
c. MMAD
d. GSD

ANS: D
The GSD describes the variability of particle sizes in an aerosol distribution set at 1 standard de-viation (SD) above or below the median (15.8% and 84.13%).

Health Professions

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Air-fluid levels on an AP chest projection

1. demonstrate an increase in density where the fluid is present. 2. are formed when air and fluid separate. 3. are precisely demonstrated when the patient is in a partially upright position. 4. are precisely demonstrated when the central ray is horizontal. a. 1 and 3 only b. 1, 2, and 4 only c. 2 and 4 only d. 2, 3, and 4 only

Health Professions

Which of the following is least likely to be imaged on a radiograph?

a. Incipient occlusal caries b. Moderate proximal surface caries c. Advanced proximal surface caries d. Severe root caries

Health Professions