RAD 170 Unit 1 Review

Which of the following groups of exposure factors will produce the greatest receptor exposure?

• 100 mA, 50 ms

• 200 mA, 40 ms

• 400 mA, 70 ms

• 600 mA, 30 ms

Which of the following can impact the remnant signal?

1. 1. Tissue density

2. 2. Pathology

3. 3. Beam restriction

• 1 and 2

• 1 and 3

• 2 and 3

• 1, 2, and 3

Answer explanation

"Remnant signal" also refers to the remnant beam, so the question is essentially asking which factors will affect our image.

Practice(s) that enable the radiographer to reduce the exposure time required for a particular image include:

1. 1. use of a higher milliamperage

2. 2. use of a higher kilovoltage

   1. 3. use of a higher ratio grid

• 1 only

• 1 and 2 only

• 2 and 3 only

• 1, 2, and 3

Answer explanation

Using a higher mA will allow us to decrease the exposure time. Using a higher kVp will increase the energy/speed of photons. Grids will not affect exposure time.

Which of these is not one of the four radiographic quality factors?

• Receptor exposure/brighness

• mAs

• Spatial resolution

• Distortion

A particular milliampere seconds value, regardless of the combination of milliamperes and time, will reproduce the same receptor exposure. This is a statement of the:

• Line-focus principle

• Inverse square law

• reciprocity law

• law of conservation of energy

Which of the following are associated with differential attenuation?

1. 1. Part thickness

2. 2. Tissue density

3. 3. Tissue Z number

• 1 only

• 1 and 2 only

• 1 and 3 only

• 1, 2, and 3

Which of the following pathologic conditions would require a decrease in exposure factors?

• Osteoporosis

• Edema

• Tumor

• Ascites

The difference in x-ray photon attenuation between various adjacent tissues and structures within the body is called:

• remnant radiation

• differential absorption

• SNR

• scattering

The primary controlling factors for receptor exposure are:

• kVp and mAs

• mAs and SID

• SID and OID

• SID, OID, FSS

Which of these pathologies is considered additive?

• Pneumothorax

• Atelectasis

• Bowel obstruction

• Emphysema