Ch 26 Test Density/image receptor exposure

The optical density range visible to the human eye is____

0.25 to 2.50

Which rule is used as a guide to maintain the same density when kVp changes?

15% rule

The minimum change necessary to cause a visible shift in density is ___ percent of mAs.

25-35%

When changing your SID from 72" to 56" decrease your mAs by____%

50%

controls x-ray beam quantity a. mAs b. kVp c. density maintenance formula d. radiographic grids e. 15% rule f. anode heel effect g. focal spot size h. recorded detail i. EI value j. visibility of detail

A

Which statement is false? a. as mAs increases, exposure increases b. As mas decreases, density decreases c. As mAs increases, density increases d. As mAs decreases, exposure increases

D

The 15% rule changes ____ and___

Density and Contrast

The brightness of the image on a viewing monitor is ____

a function of the monitor

All of the following will increase radiographic film density Except_ a. increased developer temperature b. increased dryer temperature c. increased immersion time in developer d. increased developer concentration

b

What effect does beam restriction have on film density?

beam restriction reduces the total number of photons available, in effect, it reduces the amount of scatter radiation there by reducing your mAs.

direct relationship between mAs and distance a. mAs b. kVp c. density maintenance formula d. radiographic grids e. 15% rule f. anode heel effect g. focal spot size h. recorded detail i. EI value j. visibility of detail

c

Because of the "heel effect" x-ray beam intensity is greater under the ____ side of the tube.

cathode

A change in kVp, as an exposure factor, affects a. Average beam energy b. beam intensity c. the amount of scatter production d. all of the above

d

In the event of making a single exposure that is critical to the exam success, most experienced technologists will__ a. use slightly less mAs than necessary to prevent overexposure b. overexpose the IR slightly c. provide enough exposure to permit viewing with a bright light or adequate histogram analysis d. both b. and c

d

The effect of mAs upon IR exposure is___

directly proportional

Increasing kVp from 85 to 98 kVp a. mAs b. kVp c. density maintenance formula d. radiographic grids e. 15% rule f. anode heel effect g. focal spot size h. recorded detail i. EI value j. visibility of detail

e

small and large a. mAs b. kVp c. density maintenance formula d. radiographic grids e. 15% rule f. anode heel effect g. focal spot size h. recorded detail i. EI value j. visibility of detail

g

The density maintenance formula mathematically resembles the ____

inverse square law

The relationship between exposure and SID is ____

inversely proportional to the square of the distance

Controls the average energy of the x-ray beam a. mAs b. kVp c. density maintenance formula d. radiographic grids e. 15% rule f. anode heel effect g. focal spot size h. recorded detail i. EI value j. visibility of detail

kVp

Which factor influences that average energy of photons reaching the IR?

kVp

The principal controlling factor of radiographic image density is____

mAs

Which factor influences that number of photons reacting the IR?

mAs

As you analyze your image, you come to the conclusion that it must have more exposure. As a general rule, you should increase___

mAs by 2x

The greatest factor in the production of scatter radiation is

patient thickness

A severely underexposed film image will be unable to visualize _____

recorded detail

Image brightness on an image display monitor is controlled by ___

window level