Deck 2: Digital Image Characteristics

Question 1

Each square in a matrix is called a:

A) matrix element.
B) picture element.
C) bit.
D) byte.

Answer 1

picture element.

Question 2

The range of exposure values the image detector is able to produce is known as:

A) dynamic range.
B) modulation transfer.
C) latitude.
D) detective quantum efficiency.

Answer 2

latitude.

Question 3

A perfect image processing system would have an MTF of:

A) 1%.
B) 10%.
C) 100%.
D) 1000%.

Answer 3

100%.

Question 4

The number of bits per pixel is known as bit:

A) pitch.
B) depth.
C) height.
D) width.

Question 5

The measurement for radiation that was incident on the image receptor for a particular exposure is known as:

A) Gy.
B) KSTD.
C) KIND.
D) KTGT.

Question 6

How dark or light a digital image appears on a display monitor is known as:

A) density.
B) contrast resolution.
C) brightness.
D) spatial resolution.

Question 7

Which of the following statements is not true?

A) Matrix size can change without affecting the FOV.
B) FOV can change without affecting the matrix.
C) Changing the matrix or the FOV will change the size of the pixel.
D) Changing the matrix and the FOV will not change the size of the pixel.

Question 8

Which of the following statements is not true?

A) Exposure index refers to the amount of exposure to the patient.
B) Exposure index refers to the amount of exposure to the image receptor.
C) Exposure is not uniformly represented across manufacturers.
D) Exposure index standardization is beneficial to the technologist.

Question 9

The size of the pixel is determined by the:

A) bit.
B) bit depth.
C) matrix.
D) byte.

Question 10

The continuous and varying levels of brightness and colors describes _____ images.

A) analog
B) digital
C) medical
D) radiographic

Question 11

The ability of an imaging system to demonstrate small details of an object is known as:

A) image quality.
B) contrast resolution.
C) spatial resolution.
D) dynamic range.

Question 12

A system's ability to respond to varying levels of exposure, resulting in more detail, is referred to as:

A) spatial resolution.
B) dynamic range.
C) contrast resolution.
D) dynamic resolution.

Question 13

Critical characteristics of a digital image include all of the following except:

A) contrast resolution.
B) noise efficiency.
C) sample resolution.
D) dose efficiency of the receptor.

Question 14

Factors that can adversely affect the pixel values expressed in the deviation index include all of the following except:

A) gonadal shielding within the image.
B) a prosthesis within the image.
C) failure of the system to recognize the exposure indicator.
D) failure of the system to recognize the collimated border.

Question 15

The efficiency of a system to convert x-ray input signal into a useful output image is known as:

A) dynamic range.
B) spatial resolution.
C) latitude.
D) detective quantum efficiency.

Question 16

"The sum of the components in a recording system cannot be greater than the system as a whole" is a definition of:

A) modulation transfer function (MTF).
B) enhanced visualization image processing.
C) digital image contrast and density latitude.
D) principles of contrast enhancement.

Question 17

The ability of a digital system to display subtle changes in shades of gray is called:

A) image quality.
B) contrast resolution.
C) spatial resolution.
D) dynamic range.

Question 18

The more light spread, the ______ the MTF.

A) higher
B) lower
C) more equal
D) none of these

Question 19

Deviation index is the difference between _____ and _____ expressed in logarithmic fashion.

A) actual exposure (KIND); target exposure (KTGT)
B) standard exposure (KSTD); actual exposure (KIND)
C) standard exposure (KSTD); target exposure (KTGT)

Question 20

Multiple numeric values divided into an array of small elements capable of being processed is the definition of _____ images.

A) analog
B) digital
C) medical
D) radiographic

Question 21

Air kerma is the measurement of radiation energy absorbed in a unit of air.

Question 22

MTF is a way to quantify the contribution of each system component and the component's overall efficiency.

Question 23

The reflection of ambient light can be problematic with monochromatic monitors.

Question 24

It is possible to achieve an MTF of 100%.