Ch. 10 Test Flashcards
DR stands for:
digital radiography
CR stands for:
computed radiography
T/F - The imaging plate used in a computed radiography system is non-removable,
false
T/F - Digital radiography systems use removable imaging plates.
false
Which of these are not part of the CR system:
Plate Reader
Cassette
PSP
Computer Workstation
TFT
TFT
What is the backing material of a CR cassette made of?
aluminum
Phosphor layers of the PSP can be of two types.
____ means that the crystals are randomly distributed, ____ means that the crystals are columnar, resembling needles standing on end, that are densely packed together
turbid, structured
T/F - CR PSP phosphor layers are made of europium with a barium fluorohalide activator.
false
T/F - When a PSP is irradiated, electrons get trapped in the conduction band, just outside of the valence.
true
T/F - CCD/CMOS are used in direct capture methods.
false
T/F - TFTs are used in direct capture methods.
true
This DR component does what a PSP does in CR systems.
scintillator/photodetector
T/F - CMOS is widely available in all forms of radiology.
false
The photoconductor used in direct capture DR systems is made of:
amorphous selenium
This graphic representation of data is what the computer uses to create the image.
histogram
The ____ scan is what moves the IP through the reader, the ____ scan is the laser scan of the IP.
slow, fast
Sampling frequency must be at least ____ times that of input frequency bandwidth.
2
T/F - DR imaging receptors use every single pixel of the receptor to create the image.
false
S numbers are ____ proportional
inversely
EI numbers are ____ proportional
directly
DAP can be used in ____ systems as an exposure indicator.
DR
____ is a measurement of how efficient a receptor is at converting x-ray energy into a diagnostic image.
DQE
____ is the main controller of contrast in film-screen imaging.
kVp
____ is the main controller of contrast in digital imaging
LUT
Imaging plates from CR cassettes should be cleaned every ____ months.
3
____ is the standard language of PACS systems.
DICOM
T/F - 100% DQE is ideal and is achievable.
false
____ is the measure of exposure in air, measured at the collimator.
DAP
This is the component that converts signal into a usable form for the computer to use in image formation.
ADC
What are the classifications of PACS storage types.
- online
- nearline
- offline
T/F - Automatic rescaling can correct any exposure error.
false
T/F - Technologists should window and level as needed to ensure images look the best possible before sending them for interpretation.
false
Indirect capture uses ____, while direct capture uses ____.
amorphous silicon, amorphous selenium
T/F - The radial styloid is more proximal than the radial tuberosity.
false
T/F - When standing in anatomic position, the 1st digit is more lateral to midline than the 5th digit .
true
T/F - The navicular is a bone of the hand.
false
T/F - Epicondyles of the humerus are distal to the humeral head.
true
T/F - The tubercles of the humerus are more proximal than the epicondyles.
true
T/F - The CMC joints of the hand are more distal than the MCP joints.
false
T/F - The medial malleolus of the tibia is distal to the tibial plateau.
true
