Chapter 10 Quiz Flashcards
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
b.) 1 and 2 only
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
c.) picture achiving and communication system
Computed radiography is considered digital radiography.
a.) true
b.) false
a.) true
In a direct radiography system, indirect capture provides the least amount of data loss.
a.) true
b.) false
b.) false
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
d.) 2 and 3
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
a.) photoconductor for direct capture DR imaging
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
a.) 1, 2, 3 and 5 only
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
a.) turbid layer
When processing a CR cassette, the term slow scan describes a laser light moving over a stationary IR.
a.) true
b.) false
b.) false
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
c.) conduction band
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
c.) photodetector
SID affects both spatial resolution and image distortion.
a.) true
b.) false
a.) true
Fog seen on a radiographic image is the resuly of:
a.) coherent interactions
b.) compton interactions
c.) classical interactions
d.) photoelectric interactions
b.) compton interactions
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
d.) A and B
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
a.) increase because of more compton interaction
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)
d.) thin film transistor (TFT)
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
b.) size distortion
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
d.) radiographic exposure
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
b.) conductive layer
which device converts analogue signla into a digital signal?
a.) ADC
b.) CMOS
c.) TFT
d.) CCD
a.) ADC
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
b.) photodetector for indirect capture DR imaging
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
a.) more energy is lost by the electrons
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
d.) 2, 3 and 5 only
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
d.) 1, 3 and 4 only
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
c.) DICOM
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
d.) phosphor layer
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
b.) CCD
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
d.) the use of a storage phosphor plate
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
c.) have detectors that directly capture and read out an electronic image signal
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
c.) 3, 2, 1, 4
Limiting scatter radiation does not improve image contrast.
a.) true
b.) false
b.) false
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
a.) charge coupled device
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
d.) PSP plate
e.) digitizer/reader
f.) computer workstation
g.) cassette holder
Device that absorbs xrays and emits light
Scintillator
Made of Cesium Iodide
Scintillator
Device that converts light into an electrical charge
Photodiode
Device that absorbs xrays and emits an electrical charge
Photoconductor
Device that absorbs light, creates an electrical charge, stores the charge in a capacitor and releases an electrical signal
Charge Coupled Device (CCD)
Device that absorbs and stores an electrical charge and releases an electrical signal
TFT
Device that acts as a switch and releases an electrical signal
TFT
A device that uses amorphous selenium
Photoconductor
