Deck 4: Photostimulable Phosphor Image Capture

Question 1

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

A) active
B) color
C) reflective
D) backing

Answer 1

color

Question 2

The process of scanning the moving imaging plate is known as:

A) transition.
B) raster scanning.
C) digitization.
D) translation.

Answer 2

translation.

Question 3

The purpose of the barcode label is to match the image information with the:

A) imaging plate.
B) patient identifier.
C) technologist.
D) radiographic room.

Answer 3

patient identifier.

Question 4

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

A) barium sulfate
B) halide calcium
C) barium fluorohalide
D) calcium fluorohalide

Question 5

The laser scans the imaging plate in a ______ pattern.

A) raster
B) horizontal
C) circular
D) random

Question 6

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

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

Question 7

The PSP cassette is backed by aluminum that:

A) reflects x-rays.
B) absorbs backscatter x-rays.
C) captures the image.
D) transmits x-rays.

Question 8

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 9

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

A) protective
B) reflective
C) active
D) support

Question 10

The selection of the incorrect body part from the examination menu may result in:

A) no image.
B) image misinterpretation.
C) proper density and contrast.
D) no difference in image sharpness.

Question 11

Each light photon is assigned a number during:

A) amplification.
B) sampling.
C) digitization.
D) laser scanning.

Question 12

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

A) contrast
B) density
C) spatial
D) optical

Question 13

Which of the following does not determine PSP resolution?

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

Question 14

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 15

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

A) active
B) conductive
C) protective
D) support

Question 16

PSP imaging plates are erased by flooding the plate with:

A) light.
B) radiation.
C) electrons.
D) phosphors.

Question 17

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.

Question 18

The wavelength of the PSP reader laser is ______ nm.

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

Question 19

Typical cassette throughput is _____ cassettes per _____.

A) 5; minute
B) 25; minute
C) 25; hour
D) 50; hour

Question 20

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 21

Kilovoltage peak (kVp) should be chosen:

A) to provide the least contrast possible.
B) to provide penetration.
C) for the type and amount of contrast desired.
D) for the type of imaging plate phosphor.

Question 22

Milliampere-seconds (mA-s) is selected for the:

A) shortest time possible.
B) longest time possible.
C) number of electrons needed.
D) amount of penetration needed.

Question 23

The higher the number of pixels in a matrix, the:

A) higher the image resolution.
B) lower the image resolution.
C) lack of effect on image resolution.
D) smaller the image.

Question 24

Collimation to a smaller area:

A) increases scatter.
B) increases amount of tissue irradiated.
C) decreases resolution.
D) decreases Compton interactions.

Question 25

Grid ratio describes the:

A) number of grid lines per centimeter or lines per inch.
B) angling of the lead strips to coincide with x-ray beam diversion.
C) relationship between the height of the lead strips to the interspace.
D) physical size of the grid to be used for each distance measured.

Question 26

When insufficient light is produced by the imaging plate phosphor, the image will:

A) not be formed.
B) be grainy.
C) be dark.
D) be detailed.

Question 27

Which of the following should be considered when selecting the PSP cassette?

A) size and speed.
B) type and speed.
C) size and type.
D) none of these.

Question 28

The PSP imaging plate does not require periodic erasure because of its ability to record background radiation.

Question 29

Shuttering is a postexposure image manipulation technique that:

A) is placed on the patient.
B) is placed on the cassette.
C) is added to the screen image.
D) changes the amount of scatter.

Question 30

Intermittent extraneous line patterns are _____ artifacts.

A) imaging plate
B) plate reader
C) image processing
D) printer

Question 31

The number of grid lines per centimeter or lines per inch describes grid:

A) frequency.
B) ration.
C) focus.
D) size.

Question 32

Cracks in the imaging plate can be caused by:

A) excessive kVp.
B) removing and replacing the plate in the reader.
C) improper erasure.
D) scatter through the back of the cassette.

Question 33

The range of kVp that can be used with PSP systems is:

A) 45 to 120.
B) 55 to 130.
C) 65 to 120.
D) 75 to 130.

Question 34

Grid use for PSP examinations is more critical than in film/screen radiography because CR:

A) examinations produce more scatter.
B) imaging plates record more densities.
C) imaging plates record less scatter.
D) examinations requires much higher kVp values.

Question 35

Which of the following require more critical beam centering?

A) Parallel grids
B) Focused grids
C) Low-ration grids
D) Low-frequency grids

Question 36

A technologist can lend credibility to his or her expertise by:

A) using a grid.
B) using personal position markers.
C) using less collimation.
D) none of the above.

Question 37

Quantum mottle is caused by:

A) excessive mA-s.
B) excessive kVp.
C) insufficient distance.
D) insufficient light.

Question 38

The k-edge of phosphor imaging plates ranges from ______ keV.

A) 10 to 30
B) 20 to 40
C) 30 to 50
D) 40 to 60

Question 39

Using an FOV that is much larger than the part being examined will:

A) increase resolution.
B) decrease the size of the matrix.
C) decrease the sampling rate.
D) decrease resolution.

Question 40

PSP phosphor speed and radiographic film speed are always equivalent.

Question 41

It is acceptable to replace collimation with shuttering.

Question 42

Grid lines projected onto the imaging plate will not interfere with the image.

Question 43

Images should be marked only with computerized markers.

Question 44

Less kVp is needed with conventional radiographic screens than is necessary for PSP systems.