Deck 18: Viewing the Digital Radiographic Image

Question 1

Flatfielding is accomplished through automatic calibration images called _____ and _____.

A) magnification, edge enhancement
B) offset images, gain images
C) image flip, image lag
D) image inversion, pixel shift

Answer 1

offset images, gain images

Question 2

PACS stands for _____.

A) Processing, Applications, and Computer Storage
B) Processing, Archiving, and Computer Storage
C) Physician Applications and Communication Systems
D) Picture Archiving and Communication Systems

Answer 2

Picture Archiving and Communication Systems

Question 3

Almost all medical flat panel digital display devices are _____.

A) color liquid crystal displays
B) monochrome liquid crystal displays
C) color CRTs
D) monochrome CRTs

Answer 3

monochrome liquid crystal displays

Question 4

Post-processing includes all of the following except _____.

A) image inversion
B) signal interpolation
C) annotation
D) pixel shift

Question 5

Reregistering an image to correct for patient motion is done with _____.

A) edge enhancement
B) offset images
C) pixel shift
D) image inversion

Question 6

A liquid crystal is a material in a _____ state.

A) solid
B) state between a liquid and a solid
C) liquid
D) state between a liquid and a gaseous

Question 7

The ambient light at a digital image workstation should be _____.

A) daylight bright
B) slightly dimmed
C) near darkness
D) complete darkness

Question 8

Medical flat panel display devices are identified by the _____.

A) aperture ratio
B) depth of the monitor
C) size of the pixels
D) number of pixels

Question 9

_____ is corrected by the application of an offset voltage.

A) Spatial resolution
B) Line noise
C) Image lag
D) Misregistration

Question 10

The decreasing luminous intensity with increasing distance from the source of light follows _____.

A) the law of gravity
B) Murphy's law
C) cosine law
D) the inverse square law

Question 11

Preprocessing the digital image is done _____,and post-processing is done _____.

A) automatically, manually
B) manually, manually
C) manually, automatically
D) automatically, automatically

Question 12

Almost all digital images in medical imaging are viewed and interpreted on a _____.

A) view box
B) CRT device
C) digital display device
D) television monitor

Question 13

What is the basic photometric unit?

A) lumen
B) candela
C) lux
D) nit

Question 14

The science of _____ is the study of the response of the human eye to light.

A) physiology
B) optometry
C) photometry
D) ophthalmology

Question 15

An advantage to viewing the AMLCD screen is that the image quality is equally good viewed from any angle.

Question 16

A digital display monitor is best viewed _____.

A) straight on
B) from above
C) from below
D) at a 30° angle

Question 17

Which is not a part of PACS?

A) film storage
B) a display system
C) a network
D) image acquisition

Question 18

Compared to CRTs,AMLCDs have _____.

A) better contrast
B) better gray scale definition
C) less intrinsic noise
D) all of the above

Question 19

A computation of the mean pixel value within a region-of-interest is performed for _____.

A) quantitative radiology
B) edge enhancement
C) image inversion
D) window and level adjustment

Question 20

A digital display device with higher megapixels has better spatial resolution.

Question 21

The national standard for image transmission in teleradiology is the _____ format.

A) RIS
B) DICOM
C) MB
D) PACS

Question 22

What is the file size of an image with a 1026 * 1026 matrix and a 2.5 byte gray scale depth?

A) 2,565 bits
B) 1,053 bits
C) 26 MB
D) 2.6 MB

Question 23

Image file size is determined by _____ size and gray scale.

A) RIS
B) DICOM
C) matrix
D) pixel

Question 24

Text data and email are generated at a _____ workstation in PACS.

A) Radiology Information System (RIS)
B) DICOM
C) image acquisition
D) archive retrieval

Question 25

Within a PACS network the secretarial workstation and the viewing workstation would both be called _____.

A) mainframes
B) remote devices
C) clients
D) DICOMs