Deck 5: Cassette-Based Image Acquisition

Question 1

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

Answer 1

Image misinterpretation

Question 2

Milliamperage-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

Answer 2

Number of electrons needed

Question 3

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

Answer 3

Be grainy

Question 4

Which of the following require more critical beam centering?

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

Question 5

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

Question 6

The moiré artifact results when grid lines and scanning laser are ______.

A)Not perpendicular
B)Not parallel
C)Parallel
D)Oscillating

Question 7

The number of grid lines per centimeter or lines per inch describes grid ______.

A)Frequency
B)Ration
C)Focus
D)Size

Question 8

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

A)Size and speed
B)Type and speed
C)Size and type
D)None of these

Question 9

Quantum mottle is caused by ______.

A)Excessive milliampere-seconds
B)Excessive kilovoltage peak
C)Insufficient distance
D)Insufficient light

Question 10

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 11

Collimation to a smaller area ______.

A)Increases scatter
B)Increases amount of tissue irradiated
C)Decreases resolution
D)Decreases Compton interactions

Question 12

Backscatter from the cassette/detector influences the amount of milliampere-seconds necessary to create the image.

Question 13

Using an imaging plate 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 14

Less kilovoltage peak is needed with conventional radiographic screens than is necessary for CR systems.

Question 15

The range of kilovoltage peak that can be used with CR is ______ kVp.

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

Question 16

Kilovoltage peak (kVp) should be chosen ______.

A)To provide the least contrast possible
B)To provide minimal penetration
C)For the type and amount of contrast desired
D)For the type of imaging plate phosphor

Question 17

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 18

Grid use for CR 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 kilovoltage peak values

Question 19

Using the wrong imaging plate size may result in a matrix with very small pixels.

Question 20

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 21

Which of the following manufacturers uses exposure indicator numbers in the thousands?

A)Konica
B)Phillips
C)Fuji
D)Kodak

Question 22

In all systems, exposures outside the range indicate ______.

A)Overexposure
B)Underexposure
C)Both overexposure and underexposure
D)Neither overexposure nor underexposure

Question 23

The exposure indicator number for Fuji systems is the ______ number.

A)S
B)EI
C)lgM
D)EM

Question 24

The exposure indicator number is an ______.

A)Accurate measure of the patient dose
B)Indication of radiation absorbed by the imaging plate
C)Both A and B
D)Neither A nor B

Question 25

It is acceptable to replace collimation with shuttering.

Question 26

A histogram is ______.

A)An examination of the chest
B)A graphic representation of x-ray exposure
C)A report on exposure values
D)Another name for exposure indicator value

Question 27

As Kodak exposure indicator numbers increase by 300, exposure ______.

A)Increases by a factor of 2
B)Decreases by a factor of 4
C)Increases by a factor of 4
D)Decreases by a factor of 2

Question 28

Kodak describes image recognition as ______.

A)Collimation
B)Segmentation
C)Exposure data recognition
D)Characteristic curve

Question 29

In a Fuji system, each change of exposure number of 200 is equal to a change by a factor of ______.

A)2
B)3
C)4
D)5

Question 30

A 1 mR exposure at 80 kVp combined with aluminum and copper filtration determines the ______ base exposure indicator number.

A)Fuji
B)Kodak
C)Agfa
D)Phillips

Question 31

In an Agfa system, each change of 2.6 above or below the median exposure results in a doubling or halving of exposure.

Question 32

Images should be marked only with computerized markers.

Question 33

With Fuji exposure indicators, the lower the S number, the higher the exposure.

Question 34

An S number of 400 in a Fuji system ______ an S number of 200.

A)Is double the exposure of
B)Equals the exposure
C)Is half the exposure of
D)Does not relate to

Question 35

In automatic data recognition, data is recognized ______.

A)In a zigzag pattern
B)In a parallel, vertical pattern
C)From the center out
D)From the edges in

Question 36

Shuttering, a postexposure image manipulation technique, is ______.

A)Placed on the patient
B)Placed on the cassette
C)Added to the screen image
D)Changes the amount of scatter

Question 37

The EI number is used by ______.

A)Fuji
B)Philips
C)Konica
D)None of the above

Question 38

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 39

In automatic data recognition in Fuji systems, ______ is automatically recognized.

A)Collimation
B)Image recoding range
C)Reading latitude
D)All of the above

Question 40

The latitude value of the histogram is fixed, using a small reading area in ______ mode.

A)Fixed
B)Multiple manual
C)Automatic
D)Semiautomatic

Question 41

The data recognition mode in which there is no histogram analysis is the ______ mode.

A)Fixed
B)Multiple manual
C)Automatic
D)Semiautomatic

Question 42

To avoid the moiré grid artifact, the grid must be oriented ______ to the plate reader's laser scan direction.

A)Perpendicular
B)Parallel
C)Superior
D)Inferior

Question 43

Fine white lines appearing on a hard copy of the image may be caused by ______.

A)Dirt on the light guide in the plate reader
B)Double exposure
C)Cracks in the imaging plate
D)Debris on the mirror in the laser printer

Question 44

Horizontal white lines may be caused by ______.

A)Dirt on the light guide in the plate reader
B)Double exposure
C)Cracks in the imaging plate
D)Scatter through the back of the cassette

Question 45

Dark line artifacts can be caused by ______.

A)Dirt on the light guide in the plate reader
B)Double exposure
C)Cracks in the imaging plate
D)Scatter through the back of the cassette