Question 1

The image reader scans and reads the image from the:

Accepted Answer

A)   back edge of the imaging plate to the opposite end.
B)   leading edge of the imaging plate to the opposite end.
C)   right to left side.
D)   left to right side.

Question 2

The Nyquist theorem states that the:

Accepted Answer

A)   sampling frequency must be equal to the input signal bandwidth.
B)   input signal bandwidth must be twice the sampling frequency.
C)   sampling frequency must be twice the input signal bandwidth.
D)   input signal bandwidth must be sampled twice.

Question 3

A look-up table is not used as a reference to:

Accepted Answer

A)   set appropriate kilovoltage peak and milliampere-seconds values.
B)   evaluate raw luminance values.
C)   correct luminance values.
D)   provide appropriate brightness and contrast.

Question 4

The longer an image is stored in the computed radiography (CR)  cassette, the:

Accepted Answer

A)   more detailed the processed image.
B)   more energy is lost by the electrons.
C)   easier the image is to process.
D)   slower the processing time.

Question 5

If the entire range of exposure were digitized, pixel values representing ______ would be digitized.

Accepted Answer

A)   scatter
B)   only diagnostic values
C)   only the extreme values
D)   all values

Question 6

Low-pass filtering is also known as:

Accepted Answer

A)   evening.
B)   smoothing.
C)   masking.
D)   marking.

Question 7

Changing the slope of the look-up table graph will increase or decrease:

Accepted Answer

A)   density.
B)   the number of pixels.
C)   the matrix size.
D)   contrast.

Question 8

If all of the shades were left in an image after processing, the contrast would be:

Accepted Answer

A)   too low.
B)   too high.
C)   sufficient.
D)   unaffected.

Question 9

Window width controls the ratio of black and white, also known as:

Accepted Answer

A)   window.
B)   level.
C)   contrast.
D)   matrix.

Question 10

The workstation function that allows selection of preset terms or manual text input is termed image:

Accepted Answer

A)   connection.
B)   annotation.
C)   stitching.
D)   lacing.

Question 11

Image aliasing is similar to the moiré effect caused by grid error.

Accepted Answer

A) True 
 B)False

Question 12

Data collected within the collimator are represented by a:

Accepted Answer

A)   histogram.
B)   characteristic curve.
C)   pixel graph.
D)   matrix graph.

Question 13

Proper patient demographic input is the responsibility of the:

Accepted Answer

A)   technologist
B)   QC manager.
C)   radiologist.
D)   transporter.

Question 14

Suppressing frequencies in the areas of interest is known as:

Accepted Answer

A)   algorithm application.
B)   center enhancement.
C)   edge enhancement.
D)   masking.

Question 15

A wraparound image or image aliasing occurs when:

Accepted Answer

A)   sampling occurs twice per cycle.
B)   spatial frequency is less than the Nyquist frequency.
C)   sampling occurs less than twice per cycle.
D)   spatial frequency is equal to the Nyquist frequency.

Question 16

The process of joining two or more images into one continuous image is known as image:

Accepted Answer

A)   connection.
B)   annotation.
C)   stitching.
D)   lacing.

Question 17

Automatic rescaling can be substituted for appropriate technical factors.

Accepted Answer

A) True 
 B)False

Question 18

In an effort to display the pixels for the area of interest when exposure is greater or less than what is needed to produce an image, ______ occurs.

Accepted Answer

A)   overexposure
B)   underexposure
C)   automatic collimation
D)   automatic rescaling

Question 19

Shuttering removes the dark exposed border, reducing the amount of information to be stored.

Accepted Answer

A) True 
 B)False

Question 20

Failure of the reader to find the collimation edges of an image:

Accepted Answer

A)   will result in image cutoff.
B)   may cause the image to be too bright or too dark.
C)   will eliminate all scatter.
D)   will have no effect on the resultant image.

Exam 3: Digital Radiographic Image Processing and Manipulation

Window width controls the ratio of black and white, also known as:

Correct AnswerverifiedShow Answer

If all of the shades were left in an image after processing, the contrast would be:

Correct AnswerverifiedShow Answer

A wraparound image or image aliasing occurs when:

Correct AnswerverifiedShow Answer

The longer an image is stored in the computed radiography (CR) cassette, the:

Correct AnswerverifiedShow Answer

The Nyquist theorem states that the:

Correct AnswerverifiedShow Answer

The process of joining two or more images into one continuous image is known as image:

Correct AnswerverifiedShow Answer

A look-up table is not used as a reference to:

Correct AnswerverifiedShow Answer

Failure of the reader to find the collimation edges of an image:

Correct AnswerverifiedShow Answer

Low-pass filtering is also known as:

Correct AnswerverifiedShow Answer

In an effort to display the pixels for the area of interest when exposure is greater or less than what is needed to produce an image, ______ occurs.

Correct AnswerverifiedShow Answer

The image reader scans and reads the image from the:

Correct AnswerverifiedShow Answer

The workstation function that allows selection of preset terms or manual text input is termed image:

Correct AnswerverifiedShow Answer

Shuttering removes the dark exposed border, reducing the amount of information to be stored.

Correct AnswerverifiedShow Answer

Proper patient demographic input is the responsibility of the:

Correct AnswerverifiedShow Answer

Data collected within the collimator are represented by a:

Correct AnswerverifiedShow Answer

If the entire range of exposure were digitized, pixel values representing ______ would be digitized.

Correct AnswerverifiedShow Answer

Suppressing frequencies in the areas of interest is known as:

Correct AnswerverifiedShow Answer

Automatic rescaling can be substituted for appropriate technical factors.

Correct AnswerverifiedShow Answer

Image aliasing is similar to the moiré effect caused by grid error.

Correct AnswerverifiedShow Answer

Changing the slope of the look-up table graph will increase or decrease:

Correct AnswerverifiedShow Answer

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