Question 1

A digital image with decreased spatial resolution may be due to:
1)Increased central ray angulation
2)Decreased grid ratio
3)Decreased SID

Accepted Answer

A reduction in spatial resolution may be the result of increasing tube angulation (shape distortion)or using a lower SID (size distortion).Grid ratio does not affect spatial resolution.

Question 2

A film-screen image with increased recorded detail may be due to:
1)Increased SID
2)Decreased focal spot size
3)Decreased film-screen speed

Accepted Answer

Increasing SID,using a smaller focal spot size,and using a slower film-screen system will all produce a film-screen image with increased recorded detail.

Question 3

Using a Konica digital imaging system,if an image's S number is 600 while the optimal range ends at 300,this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

Accepted Answer

Using a Konica digital imaging system,if an image's S number is 600 while the optimal range ends at 300,this means that the IR was underexposed (the S number is inversely related to exposure)and the exposure to the IR needs to be halved (because the S number is twice as high as it should be).

Question 4

A film-screen image with decreased distortion may be due to:
1)Decreased patient thickness
2)Increased SID
3)Increased focal spot size

Accepted Answer

Distortion (size and/or shape)will be reduced the greater the SID and the thinner the patient.

Question 5

A digital image with higher contrast may be due to:
1)Decreased kVp
2)Increased grid ratio
3)Decreased patient thickness

Accepted Answer

A shorter scale of contrast (higher contrast)may be the result of using a lower kVp,increasing the grid ratio (better scatter cleanup)or imaging a smaller patient (reduced scatter production).

Question 6

A film-screen image with increased density may be due to:
1)Increased OID
2)Decreased SID
3)Increased film-screen speed

Accepted Answer

Decreased SID and a faster film-screen system (more sensitive)will produce film-screen image with greater density.

Question 7

An area of decreased brightness visualized on a computer monitor has ________density on a film image.

Accepted Answer

An area of decreased brightness visualized on a computer monitor has increased density on a film image.

Question 8

When using a film-screen imaging system,changing from small to large focal spot size would result in _____________ density and ____________ recorded detail.

Accepted Answer

When using a film-screen imaging system,changing from small to large focal spot size would result in no change in density (focal spot does not impact density)and decreased recorded detail.

Question 9

The amount of luminance (light emission)of a display monitor is the:

Accepted Answer

Brightness is the amount of luminance (light emission)of a display monitor.

Question 10

Using an Agfa digital imaging system,if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM,this means that the IR was ______________ and the exposure to the IR needs to be ___________________ .

Accepted Answer

Using an Agfa digital imaging system,if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM,this means that the IR was underexposed (the lgM is directly related to exposure)and the exposure to the IR needs to be increased by a factor of two,or doubled (for every 0.3 under the range,the exposure needs to be doubled).

Question 11

When using a digital imaging system,changing from 8 × 10 collimation to 14 × 17 collimation would result in _____________ brightness and ____________ contrast.

Accepted Answer

When using a digital imaging system,changing from 8 × 10 collimation to 14 × 17 collimation would result in no change in brightness (computer will adjust)and decreased contrast (due to increased scatter production).

Question 12

The visibility of anatomic structures in a radiographic image is determined by:

Accepted Answer

The ability to make structures visible is determined by the image's brightness/density and image contrast.

Question 13

A digital image with increased distortion may be due to:
1)Decreased OID
2)Increased CR angulation
3)Decreased SID

Accepted Answer

Increased distortion (size and/or shape)will be increased when the CR is angled and the SID is decreased.

Question 14

When using a digital imaging system,changing from 40 in SID to 72 in SID would result in _____________ brightness and ____________ contrast.

Accepted Answer

When using a digital imaging system,changing from 40 in SID to 72 in SID would result in no change in brightness (computer will adjust)and no change in contrast (SID does not affect image contrast).

Question 15

A film-screen image with lower contrast may be due to:
1)Increased patient thickness
2)Increased beam restriction
3)Increased kVp

Accepted Answer

Lower,or longer scale,contrast in a film-screen image may be due to increased patient thickness (more scatter)or increased kVp.

Question 16

A film-screen image produced using 16 mAs at 80 kVp has to be repeated because it is too dark.Which of the following exposure factors would be the best choice to correct the problem?

Accepted Answer

It is best to change the mAs,because changing the kVp affects density and contrast.Knowing that a radiograph has to be repeated due to excessive density means that we need to halve the mAs to 8 mAs while the kVp remains the same.

Question 17

Which of the following changes would produce a digital image with decreased brightness?

Accepted Answer

Because the computer will adjust brightness to an acceptable level,digital image brightness is independent of mAs,kVp,and patient thickness.

Question 18

Using a Carestream digital imaging system,if an image's EI number is 1800 while the optimal range ends at 1200,this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

Accepted Answer

Using a Carestream digital imaging system,if an image's EI number is 1800 while the optimal range ends at 1200 (and therefore 600 over the optimal range),this means that the IR was overexposed (EI is directly related to exposure)and the exposure to the IR needs to be reduced by a factor of four (for every 300 over the range,the exposure needs to be halved).

Question 19

The amount of overall blackness on the processed image is the:

Accepted Answer

The amount of overall blackness on the processed image is the density.

Question 20

The variation in brightness and density on digital or film imaging is the:

Accepted Answer

Radiographic contrast or image contrast is a term used in both digital and film-screen imaging to describe the variations in brightness and density.

Quiz 9: Image Evaluation

A digital image with decreased spatial resolution may be due to: 1) Increased central ray angulation 2) Decreased grid ratio 3) Decreased SID

A film-screen image with increased recorded detail may be due to: 1) Increased SID 2) Decreased focal spot size 3) Decreased film-screen speed

Using a Konica digital imaging system,if an image's S number is 600 while the optimal range ends at 300,this means that the IR was and the exposure to the IR needs to be _____.

A film-screen image with decreased distortion may be due to: 1) Decreased patient thickness 2) Increased SID 3) Increased focal spot size

A digital image with higher contrast may be due to: 1) Decreased kVp 2) Increased grid ratio 3) Decreased patient thickness

A film-screen image with increased density may be due to: 1) Increased OID 2) Decreased SID 3) Increased film-screen speed

An area of decreased brightness visualized on a computer monitor has ________density on a film image.

When using a film-screen imaging system,changing from small to large focal spot size would result in _ density and recorded detail.

The amount of luminance (light emission) of a display monitor is the:

Using an Agfa digital imaging system,if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM,this means that the IR was and the exposure to the IR needs to be _____ .

When using a digital imaging system,changing from 8 × 10 collimation to 14 × 17 collimation would result in _ brightness and contrast.

The visibility of anatomic structures in a radiographic image is determined by:

A digital image with increased distortion may be due to: 1) Decreased OID 2) Increased CR angulation 3) Decreased SID

When using a digital imaging system,changing from 40 in SID to 72 in SID would result in _ brightness and contrast.

A film-screen image with lower contrast may be due to: 1) Increased patient thickness 2) Increased beam restriction 3) Increased kVp

A film-screen image produced using 16 mAs at 80 kVp has to be repeated because it is too dark.Which of the following exposure factors would be the best choice to correct the problem?

Which of the following changes would produce a digital image with decreased brightness?

Using a Carestream digital imaging system,if an image's EI number is 1800 while the optimal range ends at 1200,this means that the IR was and the exposure to the IR needs to be _____.

The amount of overall blackness on the processed image is the:

The variation in brightness and density on digital or film imaging is the: