Deck 10: Radiographic Image Quality

Question 1

Spatial resolution improves with decreased _________ blur.

A) screen
B) motion
C) geometric
D) All of the above

Answer 1

All of the above

Question 2

Focal spot blur can be reduced by using __________.

A) a small focal spot
B) a shorter SID
C) a larger OID
D) All of the above

Answer 2

a small focal spot

Question 3

The base + fog of a film is shown below the __________ of the characteristic curve.

A) straight-line portion
B) average gradient
C) toe portion
D) shoulder portion

Answer 3

toe portion

Question 4

What is the formula for optical density?

A) OD = log10(Io/It)
B) OD = log10(It/Io)
C) OD = Io/It
D) OD = It/Io

Question 5

What is the formula for the magnification factor?

A) MF = SID/SOD
B) MF = SOD/SID
C) MF = (SID/SOD)2
D) MF = SID2/SOD

Question 6

A high quality radiograph should always demonstrate ____________.

A) structures and tissues
B) high contrast
C) minimum magnification
D) All of the above

Question 7

Higher speed image receptors generally produce images with ____________.

A) better resolution
B) increased noise
C) higher contrast
D) improved detail

Question 8

The inherent base density plus fog density in film is _______.

A) 0.0-0.1
B) 0.1-0.3
C) 0.5-1.0
D) 1.0-1.3

Question 9

If 10% of the viewbox light is transmitted through an area of film, what is the optical density in that area?

A) 0
B) 1
C) 2
D) 3

Question 10

In general radiography, the useful optical densities lie between _____ and _____.

A) 0.25, 2.5
B) 0.5, 1.0
C) 1.0, 1.5
D) 2.0, 3.0

Question 11

Subject contrast is affected by ___________.

A) mAs
B) focal spot size
C) patient thickness
D) voltage ripple

Question 12

The slope of the __________ portion of the characteristic curve shows the film contrast.

A) base
B) shoulder
C) toe
D) straight line

Question 13

_________ is defined as the ability to image two separate objects and visually detect one from the other.

A) Contrast
B) Resolution
C) Detail
D) Noise

Question 14

The three primary geometric factors affecting image quality are ________________________.

A) distortion, subject contrast, and mAs
B) patient thickness, distortion, and magnification
C) magnification, distortion, and focal spot blur
D) kVp, focal spot blur, and contrast

Question 15

Distortion can be reduced by ____________________________.

A) placing the object plane perpendicular to the image plane
B) placing the object plane parallel to the image plane
C) directing the central ray 15° from the object plane
D) increasing the SID and the OID

Question 16

An image receptor with ____________ can be used over a greater range of exposures.

A) wide latitude
B) high contrast
C) narrow latitude
D) high average gradient

Question 17

The best way to minimize magnification is to use a __________.

A) long SID
B) small OID
C) large OID
D) Both A and B

Question 18

The densities above 2.5 on a film are represented in the __________ portion of the characteristic curve.

A) base + fog
B) toe
C) straight-line portion
D) shoulder

Question 19

Radiographic __________ is random fluctuation in the optical density of a radiograph.

A) detail
B) contrast
C) noise
D) resolution

Question 20

A film with a characteristic curve showing a high slope would be useful when ________ is needed.

A) low contrast
B) wide latitude
C) high contrast
D) fine detail

Question 21

Patient thickness affects image quality by affecting ____________.

A) magnification
B) radiographic contrast
C) focal spot blur
D) All of the above

Question 22

Optical density is primarily controlled by changing the _____.

A) kVp
B) mAs
C) film
D) SID

Question 23

Radiographic image quality is improved when the __________ is increased.

A) source image distance
B) focal spot size
C) film speed
D) screen speed

Question 24

The technologist primarily controls radiographic contrast by varying the __________.

A) image receptor
B) kilovoltage
C) voltage ripple
D) milliamperage

Question 25

Which of these body parts has the highest subject contrast?

A) Abdomen
B) Skull
C) Chest
D) Pelvis