For x-ray and gamma ray photons with energies up to 3 million electron volts (MeV), which of the following radiation quantities may be defined as the measure of the total electric charge of one sign, either all pluses or all minuses, per unit mass that these two types of radiation generate in dry air at standard temperature and pressure (760 mm Hg or 1 atmosphere at sea level and 22"1e C)?
a. Absorbed dose
b. Equivalent dose
c. Exposure
d. Collective effective dose
c. Exposure
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In Lead II, Einthoven's triangle shows:
A) the left arm is negative and the right arm is positive. B) the left arm is positive and the right arm is negative. C) the left leg is positive and the right arm is negative. D) the left leg is negative and the right arm is positive.
Which of the following statements regarding meningitis is TRUE?
A) Bacterial meningitis is more serious and can be fatal. B) Viral meningitis occurs more often during the winter months. C) The incidence of childhood meningitis has increased recently. D) Viral meningitis is spread through contact with nasal and oral secretions.
When changing the control variable from volume control (VC) to pressure control (PC), the initial inspiratory pressure should be set based on which of the following methods?
a. Body surface area multiplied by 4 b. Plateau pressure measurement taken dur-ing VC ventilation c. Maximum peak inspiratory pressure during VC ventilation d. Maximum peak inspiratory pressure minus plateau pressure during VC ventilation
Cerebral edema, neurogenic pulmonary edema and dysfunction of the cardiac conduction system may be associated with:
A) sudden unexpected death in epilepsy (SUDEP). B) dementia. C) transient ischemia attacks (TIA). D) chronic migraine headache.