Chapter 10 - Mosby Test Bank

A high quality radiograph should always demonstrate _____.

• a. structures and tissues

• b. high contrast

• c. minimum magnification

• d. all of the above

Spatial resolution improves with decreased _____ blur.

• a. screen

• b. motion

• c. geometric

• d. all of the above

_____ is defined as the ability to image two separate objects and visually detect one from

• a. Contrast

• b. Resolution

• c. Detail

• d. Noise

Radiographic _____ is random fluctuation in the optical density of a radiograph.

• a. detail

• b. contrast

• c. noise

• d. resolution

Higher speed image receptors generally produce images with _____.

• a. better resolution

• b. increased noise

• c. higher contrast

• d. improved detail

The slope of the _____ portion of the characteristic curve shows the film contrast.

• a. base

• b. shoulder

• c. toe

• d. straight line

In general radiography, the useful optical densities lie between _____ and _____.

• a. 0.25, 2.25

• b. 0.5, 1.0

• c. 1.0, 1.5

• d. 2.0, 3.0

The inherent base density plus fog density in film is _____.

• a. 0.0-0.1

• b. 0.1-0.3

• c. 0.5-1.0

• d. 1.0-1.3

What is the formula for optical density?

• a. OD = log10(Io/It)

• b. OD = log10(It/Io)

• c. OD = Io/It

• d. OD = It/ Io

If 10% of the viewbox light is transmitted through an area of film, what is the optical density in that area?

• a. 0

• b. 1

• c. 2

• d. 3