CRI Contrast & Exposure Parameters 2

Question 1

Which radiographic parameter most directly controls the energy of X-rays and thus penetrating power?

Accepted Answer

Kilovoltage peak (kVp)

Answer

kVp controls the maximum energy of X-ray photons, directly affecting their ability to penetrate the material being examined.

Question 2

In radiographic interpretation, subject contrast is primarily affected by:

Accepted Answer

Differences in material thickness and density

Answer

Subject contrast arises from differences in thickness, density, and atomic number of the material being radiographed.

Question 3

When evaluating a radiograph, increasing kVp while keeping mAs constant will generally:

Accepted Answer

Decrease image contrast and increase density

Answer

Higher kVp produces more penetrating radiation, reducing differential absorption and lowering subject contrast while increasing overall film density.

Question 4

The term 'radiographic sensitivity' in industrial RT refers to:

Accepted Answer

The smallest detectable discontinuity size relative to specimen thickness

Answer

Radiographic sensitivity is expressed as the smallest detectable discontinuity as a percentage of the total material thickness.

Question 5

Which exposure parameter, when doubled, requires halving the exposure time to maintain equivalent film density?

Accepted Answer

Milliamperage (mA)

Answer

mA and exposure time are reciprocally related; doubling mA allows the time to be halved while maintaining the same mAs and equivalent density.

(CRI) Certified Radiographic Interpreter Practice Test