RAD 121 Carroll Chap 14-16

Which of the following is equivalent to low sharpness:

• good blur

• short gray scale

• low brightness

• high penumbra

Foreshortening is a form of:

• distortion

• artifact

• umbra

• noise

The ability to distinguish two adjacent details as being separate and distinct from each other defines image:

• visibility

• resolution

• sharpness

• contrast

Penumbra occurs in all radiographic images because:

• some degree of motion cannot be avoided

• some degree of scatter radiation is always present

• x-rays emanate from an area source

• x-rays are emitted from a point source

The formula FS X OID/SOD is used to calculate the____ in a radiographic image:

• noise

• distortion

• magnification

• unsharpness

For the image of an object to be shape distorted, its length and its width must be altered by:

• different degrees

• the same degree

• one being reduced, the other increased

• off-centering

The mAs should be considered as the primary control for what aspect of the remnant x-ray beam?

• distortion

• magnification

• sharpness of detail

• intensity

Extremely low mAs could result in all of the following except:

• loss of sharpness of detail

• visible quantum mottle

• loss of exposure intensity

• loss of subject contrast

With all other factors unchanged, if mAs is increased by 50%, subject contrast in the remnant beam will:

• increase as a direct result

• decrease as a direct result

• not change at all

• may be affected indirectly, but is not directly controlled by it

All other factors equal, when mAs is reduced, the photoelectric/Compton ratio will:

• increase

• decrease

• remain unchanged