Deck 9: Sensitometry

Question 1

What aspect of the sensitometric curve represents the contrast of a film?

A) Toe
B) Shoulder
C) Slope
D) a and c

Answer 1

Slope

Question 2

The steeper the slope of the straight-line region of the sensitometric curve, the higher the contrast of the film.

Answer 2

True

Question 3

What is the range of diagnostic densities on the radiograph?

A) 0.5-1.5
B) 0.25-2.5
C) 0.5-2.0
D) 0.5-3.0

Answer 3

0.5-2.0

Question 4

Which of the following has an inverse relationship with contrast?

A) Density
B) Average gradient
C) Latitude
D) Speed

Question 5

What is the area on the sensitometric curve that represents the minimum level of density?

A) Toe
B) Shoulder
C) Slope
D) Dmax

Question 6

A film with a high average gradient will have:

A) decreased contrast.
B) increased contrast.
C) increased latitude.
D) b and c

Question 7

What is the evaluation of the response of film to exposure and processing called?

A) Densitometry
B) Sensitometry
C) Goniometry
D) Silvometry

Question 8

What is the range of optical density acceptable for base + fog values?

A) 0.10-0.20
B) 0.22-0.26
C) 1.0-1.5
D) 1.8-2.2

Question 9

Which portion of the curve should be evaluated to assess the range of exposures over which a film produces diagnostic densities?

A) Toe
B) Straight-line
C) Shoulder
D) a or c

Question 10

Which of the following should be evaluated when selecting a radiographic film?

A) Speed
B) Contrast
C) Latitude
D) All of the above

Question 11

The measurement of average gradient is the slope of the straight-line portion of the curve between:

A) 0.25 and 2.0 OD.
B) B+F and 2.0 OD.
C) 0.25 and B+F OD.
D) 0.25 plus B+F and 2.0 plus B+F OD.

Question 12

A film that allows 100% of the incident light to be transmitted has a logarithmic value of:

A) 0.
B) 10.
C) 50.
D) 100.

Question 13

What aspect of a film does the term gamma describe?

A) Speed
B) Latitude
C) Contrast
D) Base + fog

Question 14

A slower speed film's sensitometric curve will be located to the left of a faster speed film's curve.

Question 15

Which of the following optical densities is used to evaluate film speed?

A) 0.3 plus B+F
B) 1.0 plus B+F
C) 2.0 plus B+F
D) 2.5 plus B+F

Question 16

What area of the sensitometric curve includes the maximum level of density present on the film?

A) Toe
B) Shoulder
C) Slope
D) b and c

Question 17

The range of exposures that produces optical densities within the straight line region of the sensitometric curve describes:

A) solarization.
B) exposure latitude.
C) average gradient.
D) film contrast.

Question 18

Why is there always some level of optical density on a radiograph?

A) The film base has a tint added.
B) The film has some fog present from processing.
C) There are times when the film has a density of 0.
D) a and b

Question 19

What is the name of the curve associated with film analysis?

A) D log E
B) Hurter and Driffield
C) Characteristic
D) All of the above

Question 20

Where does the area of the characteristic curve known as a solarization occur?

A) Prior to the shoulder
B) After the shoulder
C) Along the slope
D) Before the toe

Question 21

When 50% of the light is transmitted through a film, the optical density (OD) is:

A) 0.0.
B) 0.3.
C) 0.5.
D) 50.

Question 22

When evaluating characteristic curves, which of the following best describes the film with the curve furthest to the left?

A) Fastest
B) Slowest
C) One with the most latitude
D) b and c

Question 23

What is the device used to measure radiographic density?

A) Sensitometer
B) Densitometer
C) Step wedge
D) a and c

Question 24

What is measured by comparison of the amount of light transmitted through an area of film with the amount of light incident on that area?

A) Speed point
B) Gamma
C) Optical density
D) Logarithmic scale

Question 25

When the optical density increases by 0.3, the percentage of light transmitted through the film:

A) decreases by a factor of 2.
B) increases by a factor or 2.
C) increases by a factor of 4.
D) remains the same.

Question 26

_____ is controlled by the design and manufacturing of the film components and the effect of processing.

A) Film contrast
B) Subject contrast
C) Dynamic range
D) Average gradient

Question 27

When optical densities lie within the toe region of the curve, a 0.3 change in log exposure (change by a factor of 2) produces a direct effect on optical densities.

Question 28

The lower the speed exposure point, the faster the film speed.

Question 29

The _____ indicates the intensity of exposure needed to produce a density of 1.0 plus B+F.

A) speed point
B) dynamic range
C) speed exposure point
D) latitude

Question 30

What aspect of a film is being assessed by looking at the amount of exposure required to achieve a density of 1.0 plus B+F?

A) Gamma
B) Latitude
C) Speed
D) Dmax