Deck 10: Radiographic Exposure Technique

Question 1

If a film image appears dark,to produce a diagnostic image you may decide to

A)increase density
B)increase mAs
C)decrease mAs
D)A and B

Answer 1

decrease mAs

Question 2

How much mAs is produced when the mA is 200 and the exposure time is 0.5 s?

A)25 mAs.
B)50 mAs.
C)100 mAs.
D)200 mAs.

Answer 2

100 mAs.

Question 3

If a film image is too light to visualize the anatomy being imaged

A)the optical densities are in the toe region of the sensitometric curve
B)the optical densities are in the straight-line region of the sensitometric curve
C)the optical densities are in the shoulder region of the sensitometric curve
D)none of the above

Answer 3

the optical densities are in the toe region of the sensitometric curve

Question 4

Generally,if a film image is dark the mAs should be

A)halved
B)kept the same;adjust something else
C)doubled
D)none of the above

Question 5

How much mAs is produced when the mA is 800 and the exposure time is 30 ms?

A)24 mAs.
B)240 mAs.
C)2,400 mAs.
D)24,000 mAs

Question 6

Which of the following has an effect on how much mAs is used for a specific examination?

A)Generator type.
B)Pathologic conditions present.
C)Type of image receptor.
D)All of the above.

Question 7

If the mA is 600 and exposure time is 10 ms,how can the mAs be doubled?

A)Increase the mA to 1200.
B)Increase the time to 20 ms.
C)Increase the mAs to 12 mAs.
D)Any of the above is correct.

Question 8

If 400 mA @ 0.03 s produces a film image of a knee that is just a bit too light to see the bony structure,the exposure factors should be changed to

A)200 mA @ 0.03 s
B)200 mA @0.12 s
C)400 mA @ 0.12 s
D)400 mA @ 0.24 s

Question 9

If a film image has sufficient but not optimal density

A)it should not be repeated
B)it should be repeated using 30% more or less mAs
C)it should be repeated using twice or half the mAs
D)none of the above

Question 10

How much of a change in mAs is the minimum required to see a visible change in density on a film image?

A)10%.
B)20%.
C)30%.
D)50%.

Question 11

Given 40 mAs,doubling the mA produces the same result as

A)doubling the time of exposure
B)doubling the mAs
C)halving the mAs
D)A and B
E)A and C

Question 12

If a film image has to be repeated because of a positioning error,what should be done if the density was just a little too much?

A)Leave the mAs alone;it was sufficient for the first image.
B)Increase the mAs by 50%.
C)Decrease the mAs by 50%.
D)Decrease the mAs by 30%.

Question 13

How much mAs is produced when the mA is 50 and the exposure time is 4000 ms?

A)20 mAs.
B)200 mAs.
C)2,000 mAs.
D)20,000 mAs.

Question 14

For film-screen imaging,increasing the mAs results in

A)decreased recorded detail
B)increased recorded detail
C)decreased density
D)increased density

Question 15

Which of the following exposure factors produces 25 mAs?

A)250 mA @ 1 s.
B)125 mA @ 2 s.
C)100 mA @ 0.25 s.
D)250 mA @ 100 ms.

Question 16

In maintaining the same mAs,there is a(n)________________ relationship between mA and exposure time.

A)direct
B)inverse
C)added
D)none of the above

Question 17

What mA should be selected to produce 32 mAs using a 0.04 exposure time?

A)128 ma.
B)200 mA.
C)400 mA.
D)800 mA.

Question 18

Which of the following is not a primary exposure technique factor?

A)KVP.
B)Time of exposure.
C)SID.
D)MA.

Question 19

The controlling factor for density when using a film-screen image receptor is

A)SID
B)mAs
C)OID
D)image receptor type

Question 20

What type of relationship do mAs have with the quantity of x-rays produced?

A)Direct proportional.
B)Direct but not proportional.
C)Inverse proportional.
D)Inverse but not proportional.

Question 21

When kVp is increased,exposure to the image receptor is increased with

A)film-screen imaging
B)digital imaging
C)A and B
D)none of the above

Question 22

With digital imaging,if the mAs is too high

A)the image brightness will appear low (dark)
B)the image brightness will appear appropriate
C)the image brightness will appear high (light)
D)none of the above

Question 23

With digital imaging,the relationship between mAs and image brightness is

A)direct
B)direct proportional
C)inverse
D)none of the above

Question 24

Using 20 mAs on a knee image (digital IR)when only 8 mAs was needed to produce sufficient remnant radiation results in

A)a dark image
B)an image with appropriate brightness
C)unnecessary patient radiation dose
D)A and C
E)B and C

Question 25

Too little remnant radiation caused by low kVp results in a digital image in which

A)the image brightness appears high (light)
B)the image brightness appears appropriate
C)quantum noise is visible
D)B and C

Question 26

With digital imaging,overexposure of the IR and excessive dose to the patient can be

A)easily determined by looking at the image brightness
B)HARD to determine by looking at the image brightness
C)determined by checking the exposure indicator value
D)A and C
E)B and C

Question 27

To maintain the same amount of radiation reaching the IR,if the kVp is increased by 15% the mAs needs to

A)remain the same
B)be doubled
C)be halved
D)be decreased by a minimum of 30%

Question 28

With digital imaging,if the image receptor is not exposed to enough radiation,
I.The image brightness will appear appropriate.
II.The image brightness will appear high (light).
III.Quantum noise will be visible

A)I and II
B)I and III
C)II and III
D)III only

Question 29

With film-screen imaging,changing from 60 kVp to 69 kVp results in an image

A)with twice the optical density
B)with four times the optical density
C)with 15% more optical density
D)with 50% more optical density

Question 30

If a film image has to be repeated because it is too dark or too light,the mAs must be changed by a factor of at least

A)1
B)2
C)4
D)30

Question 31

Kilovoltage is not usually used to adjust density with film-screen imaging because

A)it has too great an effect on patient exposure
B)it is too difficult to determine how much it should be changed
C)it affects contrast as well as density
D)it affects recorded detail as well as density

Question 32

When the intensities of radiation exiting the patient are very similar,the resulting film image has

A)low contrast
B)high contrast
C)short-scale contrast
D)A and C
E)B and C

Question 33

Increasing the kVp

A)increases the energy of the x-ray photons
B)increases the quantity of x-ray photons
C)increases the penetrating power of x-ray photons
D)all of the above

Question 34

Increasing the kVp by 15% has the same effect as

A)increasing the mAs by 15%
B)doubling the mAs
C)decreasing the mAs by 15%
D)halving the mAs

Question 35

When the intensities of radiation exiting the patient are very different from each other,the resulting film image has

A)low contrast
B)high contrast
C)short-scale contrast
D)A and C
E)B and C

Question 36

What type of relationship does kVp have with the density of a film image?

A)Direct proportional.
B)Direct but not proportional.
C)Inverse proportional.
D)Inverse but not proportional.

Question 37

With digital imaging,if the kVp is too high

A)the image brightness appears low (dark)
B)the image brightness appears appropriate
C)the image brightness appears high (light)
D)none of the above

Question 38

The relationship between kVp and the quantity of remnant radiation is known as the

A)kVp-density rule
B)15% rule
C)115% rule
D)kVp-quantity rule

Question 39

Which of the following exposure factors produces the same amount of remnant radiation as does 20 mAs at 70 kVp?

A)10 mAs @ 70 kVp.
B)10 mAs @ 80 kVp.
C)40 mAs @ 60 kVp.
D)B and C.

Question 40

With digital imaging,if the image receptor is not exposed to enough radiation

A)the image brightness will appear low (dark)
B)the image brightness will appear appropriate
C)the image brightness will appear high (light)
D)none of the above

Question 41

Which of the following is the correct formula for the inverse square law?

A)I₁/I₂ = D₁/D₂.
B)I₁/I₂ = D₂/D₁.
C)I₁/I₂ = (D₁)²/(D₂)².
D)I₁/I₂ = (D₂)²/(D₁)².

Question 42

If the intensity of radiation at 36 inches SID is 600 mR,what is the intensity if the distance is increased to 60 inches SID?

A)216 mR.
B)359.9 mR.
C)1000 mR.
D)1666.7 mR.

Question 43

To maintain the same exposure to the IR,if the SID is increased,the mAs must be

A)decreased
B)increased
C)left the same
D)doubled

Question 44

The inverse square law describes the relationship between _________ and __________.

A)kVp and density
B)mAs and density
C)distance and beam intensity
D)kVp and beam intensity

Question 45

What type of relationship does distance have with x-ray beam intensity?

A)Direct proportional.
B)Direct but not proportional.
C)Inverse proportional.
D)Inverse but not proportional.

Question 46

If the original exposure factors are 20 mAs @ 70 kVp,which of the following factors produce a film image with the same density but higher contrast?

A)10 mAs @ 80 kVp.
B)10 mAs @ 70 kVp.
C)40 mAs @ 70 kVp.
D)40 mAs @ 60 kVp.

Question 47

__________ kVp results in the intensities of radiation exiting the patient being very ____________.

A)Low;similar
B)Low;different
C)High;different
D)A and C

Question 48

If the intensity of radiation at 72 inches is 225 mR,what is the intensity if the SID is decreased to 40 inches?

A)69.4 mR.
B)125 mR.
C)405 mR.
D)729 mR.

Question 49

Standard radiographic x-ray tubes have small focal spots that measure approximately

A)0.5-0.6 mm
B)0.6-1 mm
C)1-1.2 mm
D)0.5-1.2 mm

Question 50

When the distance is decreased from 72 inches SID to 40 inches SID,the radiation reaching the measuring device

A)increases
B)decreases
C)stay the same

Question 51

When the distance is increased from 20 inches to 60 inches,the beam intensity

A)increases
B)decreases
C)stay the same

Question 52

Low kVp produces ______________ radiographic contrast and high kVp produces ____________ radiographic contrast.

A)long-scale;long-scale
B)long-scale;short-scale
C)short-scale;long-scale
D)short-scale;short-scale

Question 53

To adjust the kVp to produce the desired contrast level,the kVp must first be

A)as low as possible for radiation safety
B)as high as possible
C)high enough to penetrate the part
D)none of the above

Question 54

If the intensity of radiation at 36 inches is 480 mR,what is the intensity if the SID is increased to 72 inches?

A)360 mR.
B)240 mR.
C)120 mR.
D)60 mR.

Question 55

The line-focus principle is used to produce the _______________ actual focal spot and __________________ effective focal spot.

A)smallest;smallest
B)smallest;largest
C)largest;smallest

Question 56

Standard radiographic x-ray tubes have large focal spots that measure approximately

A)0.5-0.6 mm
B)0.6-1 mm
C)1-1.2 mm
D)0.5-1.2 mm

Question 57

Low kVp produces ______________ radiographic contrast and high kVp produces ____________ radiographic contrast.

A)higher;higher
B)lower;lower
C)lower;higher
D)higher;lower

Question 58

Focal spot size affects only

A)density
B)contrast
C)sharpness
D)noise

Question 59

Using excessive kVp with a digital IR results in

A)increased scatter reaching the IR
B)decreased image contrast after computer adjustment
C)increased patient exposure
D)A and C
E)B and C

Question 60

Focal spot size is determined by

A)the amount of kVp
B)cathode filament size
C)cathode focusing cup size
D)all of the above

Question 61

If 10 mAs produce appropriate film density at 40 inches SID,how much mAs is needed at 48 inches SID to maintain that amount of film density?

A)7 mAs.
B)8 mAs.
C)12 mAs.
D)14 mAs.

Question 62

If 32 mAs produce appropriate film density at 72 inches SID,how much mAs is needed at 36 inches SID to maintain that amount of film density?

A)8 mAs.
B)16 mAs.
C)64 mAs.
D)128 mAs.

Question 63

The distance between the x-ray focal spot and the image receptor is the

A)OID
B)SID
C)MF
D)SOD

Question 64

Changes in SID affect

A)density (film)and beam intensity
B)contrast and recorded detail
C)recorded detail and beam intensity
D)A and C
E)B and C

Question 65

If 12 mAs produce appropriate film density at 36 inches SID,how much mAs is needed at 72 inches SID to maintain that amount of film density?

A)3 mAs.
B)6 mAs.
C)24 mAs.
D)48 mAs.

Question 66

When a known mAs at 72 inches SID produces appropriate exposure to the IR,one half of the mAs can be used at

A)40 inches SID
B)48 inches SID
C)56 inches SID
D)60 inches SID

Question 67

The distance between the object being imaged and the image receptor is the

A)OID
B)SID
C)MF
D)SOD

Question 68

The distance between the x-ray focal spot and the object being imaged is the

A)OID
B)SID
C)MF
D)SOD

Question 69

Which of the following is the correct formula for the mAs/distance compensation formula?

A)mAs₁/mAs₂ = SID₁/SID₂.
B)mAs₁/mAs₂ = SID₂/SID₁.
C)mAs₁/mAs₂ = (SID₁)2/(SID₂)2.
D)mAs₁/mAs₂ = (SID₂)2/(SID₁)2.

Question 70

Using a higher SID

A)increases magnification
B)decreases magnification
C)increases size distortion
D)none of the above

Question 71

When OID cannot be reduced,it is possible to reduce size distortion by

A)increasing mAs
B)increasing SID
C)using a small focal spot size
D)decreasing SID

Question 72

_________ SID is typically used to image the chest so that the heart is seen with minimal magnification.

A)30 inches
B)40 inches
C)72 inches
D)90 inches

Question 73

If 16 mAs produce appropriate film density at 72 inches SID,how much mAs is needed at 48 inches SID to maintain that amount of film density?

A)7 mAs.
B)11 mAs.
C)24 mAs.
D)36 mAs.

Question 74

The only factor that affects exposure to the image receptor,size distortion,and image contrast is

A)SID
B)mAs
C)focal spot size
D)OID

Question 75

When the SID is increased from 36 inches SID to 72 inches SID,the mAs must be _____________ to maintain exposure to the IR.

A)decreased
B)increased
C)kept the same

Question 76

Doubling the mAs produces appropriate exposure to the IR when the SID is changed from 40 inches to

A)36 inches SID
B)48 inches SID
C)56 inches SID
D)60 inches SID

Question 77

When the SID is decreased from 72 inches SID to 40 inches SID,the radiation reaching the IR ____________,requiring a(n)_______________ in mAs to compensate.

A)increases;decrease
B)decreases;increase
C)increases;increase
D)decreases;decrease

Question 78

The indication of how much magnification is seen on a radiograph is

A)OID
B)SID
C)MF
D)SOD

Question 79

What type of relationship does mAs have with SID when the goal is to keep the exposure to the IR constant?

A)Direct proportional.
B)Direct but not proportional.
C)Inverse proportional.
D)Inverse but not proportional.

Question 80

The mAs/distance compensation formula describes the relationship between ________ and __________.

A)SID;mAs needed to compensate for changes in SID
B)SID;kVp needed to compensate for changes in SID
C)SID;exposure time needed to compensate for changes in SID
D)SID;milliamperage needed to compensate for changes in SID