Computed radiography, because of its higher exposure latitude, makes grid use on the pediatric population...

less necessary than was previously believed

What is the purpose of radiographic beam filtration?

To reduce exposure to the patient’s skin and superficial tissues by absorbing most of the lower-energy photons from the heterogeneous beam

Because multiple bony areas span the entire body, the radiation dose absorbed by the organ called bone marrow...

cannot be measured by a direct method; it can only be estimated

When using digital fluoroscopy systems, making use of the last image hold feature can

be an effective dose reduction technique.

Luminance is determined by measuring the concentration of light

over a particular field of view

Reducing the field size to the anatomic features of interest not only reduces patient exposure but also...

increases completed image quality by decreasing scatter

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RAD 201 exam 3

Question	Answer
Most fluoroscopic examinations employ a range of _____________ kVp for adult patients, depending on the body area being examined.	75 to 110
Computed radiography, because of its higher exposure latitude, makes grid use on the pediatric population...	less necessary than was previously believed
During a radiographic examination, which combination of technical exposure factors reduce patient radiation dose?	Higher kVp, lower mAs
In standard image intensification fluoroscopy, an x-ray beam half-value-layer (HVL) of 3 to 4.5 mm aluminum is considered acceptable when kVp ranges from...	80 to 100
Studies of groups such as the atomic bomb survivors of Hiroshima have shown that damage to the newborn is unlikely for doses below...	0.2 Gy
What is the purpose of radiographic beam filtration?	To reduce exposure to the patient’s skin and superficial tissues by absorbing most of the lower-energy photons from the heterogeneous beam
Because multiple bony areas span the entire body, the radiation dose absorbed by the organ called bone marrow...	cannot be measured by a direct method; it can only be estimated
When obtaining a dorsoplantar projection of a foot, which types of filters should be used to provide a greater uniform density of the anatomy?	Wedge filter
In digital radiography the number of different shades of gray that can be stored in memory and displayed on a computer monitor is termed	grayscale
Total filtration of _______________________ for fixed x-ray units operating above 70 kVp is the regulatory standard.	2.5-mm aluminum equivalent
When generator settings are changed from one mA and time combination to another, the most that linearity can vary is	10%
When performing a mobile radiographic procedure, to reduce the radiation exposure to the patient, the radiographer must use a minimal source-skin distance of at least...	30cm
When using digital fluoroscopy systems, making use of the last image hold feature can	be an effective dose reduction technique.
Luminance is determined by measuring the concentration of light	over a particular field of view
Reducing the field size to the anatomic features of interest not only reduces patient exposure but also...	increases completed image quality by decreasing scatter

Created by: evanlbates

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