Assignment Chapter 10

Question 1

How do you determine the number of pixels in a matrix?

a.) by dividing matrix rows and columns
b.) by adding matrix rows and columns
c.) by multiplying matrix rows and columns
d.) by multiplying matrix rows and the FOV

Answer 1

c.) by multiplying matrix rows and columns

Question 2

A light sensitive semiconducting device that generates an electrical charge when stimulated by light and stores this charge in a capacitor is the:

a.) scintillator
b.) charge coupled device (CCD)
c.) photodetector
d.) xray tube

Answer 2

b.) charge coupled device (CCD)

Question 3

As the pixel size decreases, the spatial resolution

a.) decreases
b.) increases
c.) stays the same

Answer 3

b.) increases

Question 4

The longer an image is stored in the CR cassette, the ___________

a.) more detailed the processed image
b.) slower the processing time
c.) more energy is lost by electrons
d.) easier the image is to process

Answer 4

c.) more energy is lost by electrons

Question 5

Amorpheus selenium is used as the:

a.) photoconductor for indirect capture DR imaging
b.) photodetector for indirect capture DR Imaging
c.) photoconductor for direct capture DR imaging
d.) photodetector for direct capture DR imaging

Answer 5

c.) photoconductor for direct capture DR imaging

Question 6

Euporium serves as:

a.) an activator for the phoshor
b.) a protective layer
c.) the reflective part of the PSP plate
d.) conductive layer

Answer 6

a.) an activator for the phosphor

Question 7

As the matrix size increases, the pixel size

a.) increases
b.) decreases

Answer 7

b.) decreases

Question 8

As the matrix size decreases, the spatial resolution

a.) decreases
b.) increases
c.) stays the same

Answer 8

a.) decreases

Question 9

In an indirect capture DR system, the electronic components that is configured in a network of detector elements is the:

a.) charge coupled device (CCD)
b.) photoconductor
c.) thin film transistor
d.) scintillator

Answer 9

c.) thin film transistor

Question 10

Part of the direct capture, DR system, the photoconductor absorbs xrays and produces an electrical signal

a.) true
b.) false

Answer 10

a.) true

Question 11

Amorphus silicon is used as the:

a.) photoconductor for indirect capture DR imaging
b.) photodetector for indirect capture DR imaging
c.) photoconductor for direct capture DR imaging
d.) photodetector for direct capture DR imaging

Answer 11

b.) photodetector for indirect capture DR imaging

Question 12

A container for the PSP plate made of lightweight plastic

a.) film
b.) cassette
c.) plate reader
d.) bucky tray

Answer 12

b.) cassette

Question 13

Part of a DR system with indirect capture, the light sensitive device that is commonly found in digital cameras is the:

a.) charge coupled device(CCD)
b.) photoconductor
c.) thin film trasistor
d.) scintillator

Answer 13

a.) charge coupled device (CCD)

Question 14

Put the following sequence of events in this indirect capture system in order

1.) the ccd converts the energy to an electronic signal
2.) the light energy is then transmitted to the CCD
3.) xrays are absorbed by the scintillator and converted to light
4.) electronic signal is sent to the computer workstation for processing and display

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

Answer 14

c.) 3,2, 1, 4

Question 15

At the time of prcessing the energy of the trapped electrons is released by exposure to a laser in a process called

a.) photodetector
b.) scintillation
c.) phosphorescence
d.) photostimulable luminescence

Answer 15

d.) photostimulable luminescence

Question 16

A material that absorbs the xray energy and emits visible light in response is a

a.) charge coupled device (ccd)
b.) photoconductor
c.) thin film transistor (TFT)
d.) scintillator

Answer 16

d.) scinitillator

Question 17

Approximately what percentage of the removed electrons are trapped in the conduction band?

a.) 1 %
b.) 25 %
c.) 50 %
d.) 99%

Answer 17

c.) 50 %

Question 18

Random distribution of crystals within the active phosphor layer of a PSP plate is termed:

a.) turbid
b.) structured
c.) columnar
d.) amorphus silicon

Answer 18

a.) turbid

Question 19

CR readers that moves the laser back and forth over the phosphor plate is considered a _________ scan

a.) fast
b.) slow
c.) moderate
d.) valence

Answer 19

a.) fast

Question 20

-Uses a plate reader

• May display a double exposure artifact
• PSP crystals

Answer 20

computed radiography

Question 21

-Charged coupled device (CCD)

-photodiode

• cesium iodide

Answer 21

Direct Radiography, Indirect capture

Question 22

• a DR system that does not use a scintillator
• photoconductor

Answer 22

Direct Radiography, Direct capture