Chapter 8 Quiz

Question 1

Which term describes the useful area of a digital image receptor?

a.) FOV
b.) VOI
c.) ROI
d.) VOF

Answer 1

a.) FOV

Question 2

_____________ imaging uses barium fluorobromide or cesium bromide for photon absorption.

a.) direct DR
b.) indirect DR
c.) CR

Answer 2

c.) CR

Question 3

_______________ compression is recoverable and does not compromise image quality.

a.) lossless
b.) lossy

Answer 3

a.) lossless

Question 4

WHich of the following are components of a CR system? (choose all that apply)

a.) workstation
b.) reader
c.) dry laser printer
d.) image receptor

Answer 4

a.) workstation
b.) reader
d.) image receptor

Question 5

Digital fluoro equipment should be tested every __________

a.) week
b.) year
c.) 6 months
d.) month

Answer 5

c.) 6 months

Question 6

A SMPTE pattern is best used to evaluate:
1.) dry laser printers
2.) electronic display devices
3.) image intensifiers
4.) DICOM systems

a.) 2 only
b.) 1 and 2
c.) 1, 2, 4
d.) 3 only

Answer 6

b.) 1 and 2

Question 7

A ___________ uses a computer chip instead of a photoconductor target.

a.) plumbicon
b.) orthicon
c.) vidocon
d.) CCD

Answer 7

d.) CCD

Question 8

Error correction tests should be performed by the:

a.) service engineer
b.) QC technologist
c.) physicist
d.) technologist

Answer 8

a.) service engineer

Question 9

What are the disadvantages of DR? (choose all that apply)

a.) backscatter
b.) dropped pixels
c.) electronic noise
d.) lower SNR

Answer 9

a.) backscatter
b.) dropped pixels
c.) electronic noise

Question 10

WHen is a coupling element needed in DR?

a.) when using a direct capture IR
b.) when using a indirect capture IR
c.) when used with an amorphous silicon photodetector
d.) when used with an amotphous selenium photoconductor

Answer 10

b.) when using an indirect capture IR

Question 11

A DEL is also known as a :

a.) CCD
b.) AMA
c.) TFT
d.) pixel

Answer 11

d.) pixel

Question 12

Which of the following describes a health record that covers the full range of a patients health history?

a.) RIS
b.) EHR
c.) EMR
d.) HIS

Answer 12

b.) EHR

Question 13

The ability to resolve relatively large objects with similar density is called:

a.) high contrast resolution
b.) low contrast resolution
c.) flux gain
d.) magnification

Answer 13

b.) low contrast resolution

Question 14

The ability to resolve relatively large objects with similar density is called:

a.) high contrast resolution
b.) low contrast resolution
c.) flux gain
d.) Minification

Answer 14

b.) low contrast resolution

Question 15

Which fluoroscopy mode results in higher patient dose because it films in multiple frames per second?

a.) continuous
b.) pulsed interlaced
c.) slow scan
d.) pulsed progressive

Answer 15

a.) continuous

Question 16

WHat is the primary factor that influences contrast in a digital image?

a.) kvp
b.) mas
c.) rescaling
d.) look up table (LUT)

Answer 16

d.) Look up table (LUT)

Question 17

WHen exposing the second image in a series of xrays any residual TFT charge could result in :

a.) histogram error
b.) fading
c.) erasure
d.) ghosting

Answer 17

d.) ghosting

Question 18

Amorphous silicon and cesium iodide is used in:

a.) CR imaging
b.) direct DR Imaging
c.) indirect DR Imaging

Answer 18

c.) Indirect DR Imaging

Question 19

The most common types of electronic display devices used today are:
1.) CRT
2.) HD
3.) LCD
4.) Plasma

a.) 1 only
b.) 1, 3, 4
c.) 3 and 4
d.) 2, 3, 4

Answer 19

b.) 1, 3, 4

Question 20

A semiannual or annual QC test would be:
1.) generator testing
2.) film processor maintenance if hard copies are printed
3.) clean CRT screen monitors
4.) evaluate exposure indicator accuracy

a.) 1 and 4
b.) 2, 3 and 4
c.) 1 only
d.) 2 and 3

Answer 20

a.) 1 and 4

Question 21

Which of the following is NOT true of lossy compression

a.) compromises image quality
b.) cannot be reversed
c.) data is recoverable
d.) data can be compressed to 5 to 50 times

Answer 21

c.) data is recoverable