Deck 7: Image Receptors

Question 1

What is the term generally used to describe the emission of light from a substance as the result of external stimulation?

A) Luminescence
B) Phosphorescence
C) Fluorescence
D) Incandescence

Answer 1

Luminescence

Question 2

What is measured by comparing an exposure without an intensifying screen to an exposure with an intensifying screen?

A) Absorption efficiency
B) Conversion efficiency
C) Intensification factor
D) Screen lag

Answer 2

Intensification factor

Question 3

What is achieved when the color of light emitted by an intensifying screen matches the color of light a film responds to?

A) Chromatic spectrometry
B) Orthochromatic sensitivity
C) Panchromatic matching
D) Spectral matching

Answer 3

Spectral matching

Question 4

What kind of radiographic film is designed to respond specifically to x-radiation and not to the light emitted from intensifying screens?

A) Direct exposure film
B) Screen film
C) Orthochromatic film
D) Panchromatic film

Question 5

What are the physical imperfections in the emulsion layer of radiographic film called?

A) Silver bromide crystals
B) Silver iodide crystals
C) Sensitivity specks
D) Silver halide crystals

Question 6

Increasing the thickness of the intensifying screen phosphor layer:

A) increases speed, increases recorded detail, and increases patient dose.
B) decreases speed, increases recorded detail, and decreases patient dose.
C) increases speed, decreases recorded detail, and increases patient dose.
D) increases speed, decreases recorded detail, and decreases patient dose.

Question 7

What is the term specifically used to describe the emission of light during stimulation only?

A) Luminescence
B) Phosphorescence
C) Fluorescence
D) Incandescence

Question 8

Which layer of the intensifying screen is closest to the film?

A) Protective layer
B) Base
C) Phosphor layer
D) Emulsion

Question 9

How much of the x-ray beam do calcium tungstate phosphors absorb?

A) 5%
B) 30%
C) 60%
D) 90%

Question 10

Which layer of the intensifying screen is the furthest from the film?

A) Base
B) Reflective layer
C) Phosphor layer
D) Adhesive

Question 11

What is the effect of the presence of a reflective layer within the intensifying screen?

A) Increased speed, increased recorded detail, and increased patient dose
B) Decreased speed, increased recorded detail, and decreased patient dose
C) Increased speed, decreased recorded detail, and increased patient dose
D) Increased speed, decreased recorded detail, and decreased patient dose

Question 12

What is the purpose of the intensifying screen?

A) To decrease the production of scatter radiation
B) To reduce the amount of scatter striking the film
C) To reduce the amount of exposure to the patient
D) b and c

Question 13

How can you describe a noisy image?

A) An image with noticeable quantum mottle
B) An image that is high-quality and has high contrast
C) An image without quantum mottle
D) An image created with high mAs

Question 14

What influences the speed of radiographic film?

A) The amount of silver halide crystals in the emulsion
B) The color of the dye added to the film base
C) The size of the silver halide crystal
D) a and c

Question 15

Which of the following may influence the presence of quantum mottle?

A) Screen speed
B) mAs
C) Phosphor type
D) All of the above

Question 16

When a film has the emulsion coated on both sides of the base versus one side of the base, the film is referred to as:

A) single emulsion film.
B) duplicating film.
C) double emulsion film.
D) a or b

Question 17

What is the term specifically used to describe the emission of light during and after external stimulation?

A) Luminescence
B) Phosphorescence
C) Fluorescence
D) Incandescence

Question 18

What is the outermost layer of radiographic film called?

A) Emulsion
B) Supercoat
C) Base
D) Gelatin

Question 19

What is the term used to describe the color of light to which a radiographic film is sensitive?

A) Chromatic spectrometry
B) Orthochromatic sensitivity
C) Panchromatic matching
D) Spectral sensitivity

Question 20

How much of the x-ray beam do rare earth phosphors absorb?

A) 5%
B) 30%
C) 60%
D) 90%

Question 21

The front or tube side of radiographic cassettes should be made of a material that:

A) absorbs most of the x-ray beam.
B) reduces scatter production.
C) filters the beam.
D) absorbs very little of the x-ray beam.

Question 22

The CR latent image consists of:

A) electrons trapped in the phosphor layer.
B) clumps of metallic silver in the emulsion.
C) light trapped in the phosphor layer.
D) computer data.

Question 23

What primarily controls the statistical fluctuation in the quantity of x-ray photons that form the image?

A) mAs
B) mA
C) Focal spot size
D) Collimation

Question 24

CCD stands for:

A) central composite device.
B) copper conductive device.
C) creative communicating device.
D) charge-coupled device.

Question 25

CR imaging plates that have not been used for 48 hours:

A) are ready to be used.
B) should be discarded.
C) should be run through an erasure cycle.
D) need twice the normal mAs to be used.

Question 26

DR imaging systems briefly store the electrical charge in the:

A) EVT.
B) TFT.
C) DRT.
D) EST.

Question 27

The material used as the CR photostimulable phosphor is:

A) gadolinium oxysulfide with terbium.
B) barium fluorohalide with europium.
C) lanthanum oxybromide with thulium.
D) yttrium oxysulfide with terbium.

Question 28

After exposure to light or x-ray energy, the silver halide (AgBr) crystal becomes:

A) a positive ion of silver (Ag+), neutral bromine (Br), and a free electron (e-).
B) a negative ion of silver (Ag-), a negative ion of bromine (Br-), and a free electron (e-).
C) a positive ion of silver (Ag+), a negative ion of bromine (Br-), and a free electron (e-).
D) a negative ion of silver (Ag-), neutral bromine (Br), and a free electron (e-).

Question 29

The Gurney-Mott theory is associated with:

A) CR latent image formation.
B) film latent image formation.
C) DR latent image formation.
D) rare-earth phosphor intensifying screens.

Question 30

What is the effect of the presence of a dye in the phosphor layer of the intensifying screen?

A) Decreased speed, increased recorded detail, and increased patient dose
B) Decreased speed, increased recorded detail, and decreased patient dose
C) Increased speed, decreased recorded detail, and increased patient dose
D) Increased speed, decreased recorded detail, and decreased patient dose

Question 31

The DR detector array is typically located:

A) inside the cassette.
B) by the computer keyboard.
C) on top of the table.
D) where you would normally find the Bucky tray.

Question 32

What is used to assess screen-film contact?

A) Spinning top
B) Wire mesh test tool
C) Gauze compression device
D) Nine penny test