Physics Summer Test

Question 1

Where is the x-ray tube located for fluoroscopy

Answer 1

Under the table

Question 2

What would happen to a radiograph if the reciprocating grid is not activated

Answer 2

Grid lines

Question 3

Which factor would be used to control contrast

Answer 3

Collimation

Question 4

As the grid ratio increases, the scale of contrast will

Answer 4

Shorten

Question 5

What determines the wavelength of an x-ray

Answer 5

Kilovoltage

Question 6

What is the minimum filtration of an x-ray machine of 70 kVp

Answer 6

2.5 mm/ aluminum equivalent

Question 7

Long scale contrast best refers to

Answer 7

Low contrast

Question 8

As distance increases, ______ will _______

Answer 8

Intensity, decrease

Question 9

The quantity of x-rays is proportional to

Answer 9

mAs

Question 10

Referring to the heel effect, the thickest portion should be placed on the ______ side of the tube

Answer 10

Cathode

Question 11

An outer shell electron is knocked out, the x-ray photon gives up some energy and is scattered. This is referring to

Answer 11

Compton

Question 12

When shielding an infant during fluoroscopy, the shield should be placed

Answer 12

Under the Infant

Question 13

Two ways to protect a patient from radiation are

Answer 13

Collimation and Shielding

Question 14

An AP lumbar spine is done with 80 kVp, 30 mAs, and an 8:1 grid. If the 100-speed screen used is changed to 200-speed, how should the technique be modified

Answer 14

Change the mAs to 15

Question 15

High-speed class will do what

Answer 15

Lower the patient dose

Question 16

Compton interactions are scattering events while photoelectric interactions are absorption events (T/F)

Answer 16

True

Question 17

Grid cutoff = SID/Grid ratio (T/F)

Answer 17

True

Question 18

mAs and patient dose are directly proportional (T/F)

Answer 18

True

Question 19

An increase in filtration will

Answer 19

Increase the average energy of the beam

Decrease the total number of x-rays in the beam

Harden the Beam

Question 20

More x-rays will be produced with a tungsten anode than a molybdenum anode (T/F)

Answer 20

True

Question 21

IP phosphors can be arranged in turbid or columnar orientation (T/F)

Answer 21

True

Question 22

An IP phosphor with higher DQE would require lower mAs to produce a diagnostic image (T/F)

Answer 22

True

Question 23

A hypersthenic patient when compared to an asthenic patient will

Answer 23

Cause the film to be lighter if the same technique is used

Cause the film to demonstrate a longer scale of contrast with the same technique

Will cause less recorded detail and more distortion on the film