Deck 4: Cassette-Based Equipment: the Computed Radiography Cassette, Imaging Plate, and Reader

Question 1

The signal trapped in the phosphor center ______.

A)Is never completely lost
B)Remains for a few minutes
C)Remains for a few seconds
D)Is instantaneously released

Answer 1

Is never completely lost

Question 2

The purpose of the barcode label is to identify the ______.

A)Imaging plate
B)Patient
C)Technologist
D)Radiographic room

Answer 2

Imaging plate

Question 3

The reflective layer ______.

A)Absorbs and reduces static
B)Gives the imaging sheet strength
C)Protects the back of the cassette
D)Sends light in a forward direction

Answer 3

Sends light in a forward direction

Question 4

Coherent light is formed by the laser because the photons ______.

A)Are at right angles to each other
B)Travel in all directions
C)Travel in the same direction
D)Are at varying frequencies

Question 5

Lasers create and amplify wide, soft beams of divergent light.

Question 6

Which one of the following serves to protect against static buildup, dust collection, and mechanical damage to the imaging plate?

A)Aluminum backing
B)Lightweight plastic
C)Felt material
D)Cassette front

Question 7

The laser scans the imaging plate in a ______ pattern.

A)Raster
B)Horizontal
C)Circular
D)Random

Question 8

The process of scanning the moving imaging plate is known as ______.

A)Transition
B)Raster scanning
C)Digitization
D)Translation

Question 9

The CR cassette is backed by aluminum that ______.

A)Reflects x-rays
B)Absorbs x-rays
C)Captures the image
D)Transmits x-rays

Question 10

The device that moves the laser rapidly back and forth across the imaging plate is known as ______.

A)Beam optics
B)Laser scanner
C)Beam deflector
D)Optical mirror

Question 11

Typical cassette throughput is ______.

A)5 cassettes/min
B)25 cassettes/min
C)25 cassettes/hour
D)50 cassettes/hour

Question 12

The optical mirror in the reader ______.

A)Directs the laser beam to the imaging plate surface
B)Forms the laser beam into a circle
C)Causes the laser beam to diverge
D)Creates the laser beam

Question 13

The power source for the laser must be ______.

A)Oscillating
B)Constant
C)Preheated
D)Cold

Question 14

The layer of the imaging plate that traps electrons during exposure is the ______ layer.

A)Protective
B)Reflective
C)Active
D)Support

Question 15

During laser beam formation, both ends of the laser reflect energy back and forth so that the atoms ______.

A)Absorb each other
B)Bombard each other
C)Lose energy
D)Create x-ray energy

Question 16

Each light photon is assigned a number during ______.

A)Amplification
B)Sampling
C)Digitization
D)Laser scanning

Question 17

The phosphor layer is made of phosphors from the ______ family.

A)Barium sulfate
B)Halide calcium
C)Barium fluorohalide
D)Calcium fluorohalide

Question 18

The wavelength of the CR reader laser is ______ nm.

A)336
B)636
C)633
D)366

Question 19

When the imaging plate is irradiated, stimulated electrons enter the ______ layer.

A)Active
B)Conductive
C)Protective
D)Support

Question 20

The imaging plate layer that absorbs stimulating light and reflects emitted light is the ______ layer.

A)Active
B)Color
C)Reflective
D)Backing

Question 21

CR imaging plates are erased by flooding the plate with ______.

A)Light
B)Radiation
C)Electrons
D)Phosphors

Question 22

The amount of detail present in any image is known as ______ resolution.

A)Contrast
B)Density
C)Spatial
D)Optical

Question 23

The imaging plate reader uses a laser to scan the imaging plate, releasing the energy stored in the conductive layer as ______ light.

A)Infrared
B)Ultraviolet
C)White
D)Blue

Question 24

Which of the following does not determine CR resolution?

A)Phosphor layer thickness
B)Pixel size
C)The number of pixels
D)Laser scan speed

Question 25

The number of bits per pixel is known as bit ______.

A)Pitch
B)Depth
C)Height
D)Width

Question 26

CR phosphor speed and radiographic film speed are always equivalent.

Question 27

Cassette-based spatial resolution is lower than conventional radiography.

Question 28

Each square in a matrix is called a ______.

A)Matrix element
B)Picture element
C)Bit
D)Byte

Question 29

If a pixel has a bit depth of 2⁹, the number of gray tones that pixel can produce is ______.

A)256
B)512
C)1024
D)2500

Question 30

Imaging plates should be erased every ______.

A)Day
B)Week
C)Month
D)Year