Chapter 10 Quiz

Question 1

An image demonstrating many brightness levels, or shades of gray, with only slight differences between the levels/shades is said to possess:
1.) long scale contrast
2.) low contrast
3.) short scale contrast

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

Answer 1

b.) 1 and 2 only

Question 2

What does the acronym PACS stand for?

a.) picture acquisition and communication system
b.) practitioner acquisition and communication system
c.) picture archiving and communication system
d.) practitioner archiving and communication system

Answer 2

c.) picture achiving and communication system

Question 3

Computed radiography is considered digital radiography.

a.) true
b.) false

Answer 3

a.) true

Question 4

In a direct radiography system, indirect capture provides the least amount of data loss.

a.) true
b.) false

Answer 4

b.) false

Question 5

Compared with a low ratio grid, a high ratio grid, will:
1.) allow more centering latitude
2.) absorb more scattered radiation
3.) absorb more primary radiation

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

Answer 5

d.) 2 and 3

Question 6

Amorpheus selenium is used as the:

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

Answer 6

a.) photoconductor for direct capture DR imaging

Question 7

Appropriate scatter radiation control methods include which of the following?
1.) tight collimation
2.) lead masking at the edge of the exposure field
3.) appropriate use of a grid
4.) lower mA settings
5.) using an air gap method

a.) 1, 2, 3 and 5 only
b.) 1, 2 and 4 only
c.) 1, 2, 3, 4 and 5
d.) 2, 3 and 5 only

Answer 7

a.) 1, 2, 3 and 5 only

Question 8

The part of the PSP plate that includes a random distribution of crystals is the:

a.) turbid layer
b.) structured layer
c.) conductive layer
d.) reflective layer

Answer 8

a.) turbid layer

Question 9

When processing a CR cassette, the term slow scan describes a laser light moving over a stationary IR.

a.) true
b.) false

Answer 9

b.) false

Question 10

In CR, what part of the phosphor layer traps electrons (latent image) prior to processing?

a.) reflective layer
b.) conductive layer
c.) conduction band
d.) valence band

Answer 10

c.) conduction band

Question 11

What is a device that absorbs light and emits an electric charge in response?

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

Answer 11

c.) photodetector

Question 12

SID affects both spatial resolution and image distortion.

a.) true
b.) false

Answer 12

a.) true

Question 13

Fog seen on a radiographic image is the resuly of:

a.) coherent interactions
b.) compton interactions
c.) classical interactions
d.) photoelectric interactions

Answer 13

b.) compton interactions

Question 14

which of the following are considered a direct radiography imaging system (DR)?

a.) indirect conversion
b.) direct conversion
c.) computed radiography
d.) A and B

Answer 14

d.) A and B

Question 15

As kvp increase, scatter radiation will:

a.) increase because of more compton interaction
b.) decrease because of less photoelectric interaction
c.) remain unchanged
d.) decrease because of less compton interactions

Answer 15

a.) increase because of more compton interaction

Question 16

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

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

Answer 16

d.) thin film transistor (TFT)

Question 17

An increase in the image size of an object compared with its true, or actual, size, is called:

a.) shape distortion
b.) size distortion
c.) sharpness distortion
d.) minification

Answer 17

b.) size distortion

Question 18

In digital imaging, kilovoltage is an influencing factor of:

a.) radiographic exposure time
b.) none of the above
c.) radiographic film contrast
d.) radiographic exposure

Answer 18

d.) radiographic exposure

Question 19

Part of a PSP plate that reduced and carries away static electricity is the:

a.) reflectice layer
b.) conductive layer
c.) support layer
d.) turbid layer

Answer 19

b.) conductive layer

Question 20

which device converts analogue signla into a digital signal?

a.) ADC
b.) CMOS
c.) TFT
d.) CCD

Answer 20

a.) ADC

Question 21

Amorphus silicon is used as the:

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

Answer 21

b.) photodetector for indirect capture DR imaging

Question 22

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

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

Answer 22

a.) more energy is lost by the electrons

Question 23

Which of the following are factors that affect contrast in digital imaging?
1.) mA and/or time
2.) windowing
3.) kvp
4.) PACs
5.) look up table

a.) 2, 3, 4 and 5 only
b.) all choices are responsible for image contrast
c.) 3 and 5 only
d.) 2, 3 and 5 only
e.) b only

Answer 23

d.) 2, 3 and 5 only

Question 24

Decreased patient thickness results in:
1.) increased IR exposure
2.) increased heel effect
3.) decreased distortion
4.) higher image contrast

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

Answer 24

d.) 1, 3 and 4 only

Question 25

Which of the following is a ccommon computer language that allows other systems of PACs to communicate with each other? ( such as printers, workstations, etc) a.) PACs b.) HIS c.) DICOM d.) RIS

Answer 25

c.) DICOM

Question 26

In CR, which layer of the image receptor is responsible for collecting the latent image? a.) valence layer b.) reflective layer c.) support layer d.) phosphor layer

Answer 26

d.) phosphor layer

Question 27

Part of a DR system with indirect capture, the light sensitive device that is commonly found in digital cameras is the: a.) TFT b.) CCD c.) scintillator d.) photoconductor

Answer 27

b.) CCD

Question 28

Computed radiography acquires an image through ____________ a.) the heating of a thermoluminescent device b.) an electrically charged cassette c.) conventional film/screen processing using a digital scanner d.) the use of a storage phosphor plate

Answer 28

d.) the use of a storage phosphor plate

Question 29

Which of the following statements is true concerning direct radiography (DR) systems? a.) use storage phosphors to temporarily store energy representing the image signal b.) require that the storage phosphor undergoes a process to extract the latent image c.) have detectors that directly capture and read out an electronic image signal d.) A and B

Answer 29

c.) have detectors that directly capture and read out an electronic image signal

Question 30

Put the following sequence of events in this direct capture system in order 1.) the TFT collects the signal 2.) light energy is transmitted to the photodiode 3.) xrays are absorbed by the scintallator and converted to light 4.) electronic signal is sent to the computer work station for processing and display a.) 1, 2, 3, 4 b.) 3, 1, 2, 4 c.) 3, 2, 1, 4 d.) 4, 3, 1, 2

Answer 30

c.) 3, 2, 1, 4

Question 31

Limiting scatter radiation does not improve image contrast. a.) true b.) false

Answer 31

b.) false

Question 32

A light sensitive semiconducting device that generates an electrical charge when stimulated by liught and stores this charge in a capacitor is the: a.) charge coupled device b.) xray tube c.) anode of the camera tube d.) cathode of the camera tube

Answer 32

a.) charge coupled device

Question 33

What are the primary parts of a CR imaging system? choose all that apply. a.) photodetector b.) scintillator c.) CCD d.) PSP plate e.) digitizer/reader f.) computer workstation g.) cassette holder

Answer 33

d.) PSP plate e.) digitizer/reader f.) computer workstation g.) cassette holder

Question 34

Device that absorbs xrays and emits light

Answer 34

Scintillator

Question 35

Made of Cesium Iodide

Answer 35

Scintillator

Question 36

Device that converts light into an electrical charge

Answer 36

Photodiode

Question 37

Device that absorbs xrays and emits an electrical charge

Answer 37

Photoconductor

Question 38

Device that absorbs light, creates an electrical charge, stores the charge in a capacitor and releases an electrical signal

Answer 38

Charge Coupled Device (CCD)

Question 39

Device that absorbs and stores an electrical charge and releases an electrical signal

Answer 39

TFT

Question 40

Device that acts as a switch and releases an electrical signal

Answer 40

TFT

Question 41

A device that uses amorphous selenium

Answer 41

Photoconductor