Image Production- image acquisition, and evaluation

Question 1

What may be the cause of an over exposed image?

Answer 1

SID too low

Question 2

If the KVP is increased 15 percent, how much must the mAs be reduced in order to maintain the same receptor exposure?

Answer 2

50 percent

Question 3

What distance would produce the lease distortion?

Answer 3

72 in
The longer the SID, the less size distortion

Question 4

A non-great exposure requires 15 mAs. How much mAs is needed if a 5:1 ratio grid is used?

Answer 4

30 mAs

Question 5

Which of the following will occur on the tube angle is decreased?

Answer 5

Shape distortion will decrease

Question 6

Special resolution can be improved by reducing which of the following?

Answer 6

Focal spot size

Question 7

If the mA is set at 400 and the mAs obtained is 80, what is the exposure time?

Answer 7

0.2 seconds

To calculate time, divide the mAs by the mA

Question 8

SID should be reduced by 1 inch for every ————— degrees or CR angle?

Answer 8

5

Question 9

How are mA and seconds related to eachother when used to maintain receptor exposure?

Answer 9

Inversely proportional

Question 10

The ratio of SID to SOD represents which of the following?

Answer 10

Magnification ratio

Question 11

What is the greatest advantage of digital imaging?

Answer 11

Contrast resolution

Question 12

What is the best method to reduce scatter radiation which causes fog?

Answer 12

Collimation

Question 13

Spatial resolution can be improved by?

Answer 13

Maximum SID

Question 14

What is an advantage of the air gap technique?

Answer 14

Eliminates the need for a grid

Question 15

How will be in filtration affect the primary beam?

Answer 15

Make it more homogeneous

Question 16

If the S ID is increase the same as the OID, what will the resultant radiograph show?

Answer 16

An increase in size distortion

Magnification formula SID/SOD

Question 17

How much mAs will be generated if the control panel is set at 200 mA and 1/5 second?

Answer 17

40 mAs

mAs= 200 mA x 1/5 second

Question 18

Geometric and sharpness is directly proportional to which of the following?

Answer 18

OID

Question 19

Time can be decreased by half if the KVP is increased by what percentage?

Answer 19

15%

Question 20

What condition would be considered easy to penetrate?

Answer 20

Degenerative arthritis

Question 21

What are the two types of distortion that can reduce the quality of a radiograph?

Answer 21

Size and shape

Question 22

Density was the term used to describe the overall blackening of a film screen radiograph. What term is used in digital imaging to describe this radiographic quality?

Answer 22

Receptor exposure

Question 23

Wavy pattern that results when to geometrically parallel lines are super impose is referred to as what?

Answer 23

Moire effect

Question 24

What is the correct name for loss of sharpness due to the use of a large focal spot?

Answer 24

Unsharpness

Question 25

Which of the following technique adjustment should be made on radio graphing a geriatric patient with osteoporosis?

Answer 25

Decrease kvp (Osteoporosis is easy to penetrate)

Question 26

Because of the anode Hill affect where is the intensity of the x-ray being the greatest?

Answer 26

At the cathode end

Question 27

Which of the following would be used to minimize size distortion?

Answer 27

Shortest Possible OID Longest SID

Question 28

And underexpose radiograph may because by what?

Answer 28

Grid cutoff

Question 29

When using AEC, which method can be used to control motion by reducing exposure time?

Answer 29

Increase mA

Question 30

Which of the following is not one of the three elements that affect shape distortion?

Answer 30

SID (SID effects size distortion not shape)

Question 31

What condition would be considered hard to penetrate

Answer 31

Osteosclerosis

Question 32

If a technique of 300 mA, 1/10 second and 60 kVp is to be changed to 69 kVp what would the new time be?

Answer 32

1/20 second (Cut time in half to compensate for 15% increase in kvp)

Question 33

Spatial resolution is not affected by which of the following?

Answer 33

kVp

Question 34

Which of the following radiographic qualities determines the sharpness of detail in the finish radiograph?

Answer 34

Spatial resolution and distortion

Question 35

A flat panel detectors DEL size determines what of the following?

Answer 35

Spatial resolution