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CR- Bushong Ch. 15

What is the principal difference between screen-film radiology and CR? Analog vs. digital
The laser light used in CR has a ............. wavelength than the emitted light. longer
Which of the following can be eliminated during switching from film-screen to CR? a- process image b- reload cassette c- repeat examination d- perform examination b- reload cassette
An electron is described as being metastable: Has higher energy than it should have
Which of the following is most intense? a- Laser light b- normal visual light c- stimulable emission d- x-ray beam a- laser light (focused/high intensity vs. x-ray that has weak and strong)
Which of the following is monochromatic? a- infrared light b- laser light c- stimulated emission d- visible light e- x-ray beam b- laser light (because its finely focused intense light)
PSP image receptors are effective because: metastable states are produced
About how much time can pass between exposing a CR cassette and reading it before image quality declines? 8 hours
As a descriptor of a PSP, the term turbid refers to an appearance that is: cloudy
True/False: PSP image receptors can be fogged by background radiation true
To remove the image of background radiation or a previous image, one should: Expose the image receptor to intense white light
PSP emit light when exposed to: exposed to x-rays
SPS emit light when exposed to: exposed to light
The photostimulable emission in CR has a ............. wavelength than the laser-stimulating light shorter
The slow scan portion of the CR reader is under .............. control mechanical
spacial resolution in CR is principally determined by: laser beam diameter
the source of the stimulating light is: the laser
How does the CR reader maintain the laser beam as a circle? beam shaping optics
Which of the following is NOT a photodetector? a- ADC b- CCD c- CMOS d- PD e- PMT a- ADC (analog-to-digital converter)
The x-ray capture element of a CR imaging plate is the: BaFBr (barium fluorohalide)
The characteristic curve of a CR imaging plate is described as: Image receptor response function
An advantage of CR over screen-film radiography, regardless of the type of examination, is the relatively constant: image contrast
Patient radiation dose reduction in CR is limited by: system noise
Which is less important (kVp or mAs) when CR is compared with screen-film radiography? kVp- because algorithms in computer can alter contrast to compensate for kVp technique
True/False: Fewer repeats is an advantage of CR over screen-film radiography True: due to technique compensation in the computer
CR imaging allows for the display of about how many shades of grey? 10,000 shades of grey
Screen-film radiography allows for the display of about how many shades of grey? 30 shades of grey
What are the 3 main sources of image noise in CR? Mechanical defects, Optical defects, Computer defects
What types of mechanical defects can occur? slow scan driver and fast scan driver
What types of optical defects can occur? Laser intensity control, scatter of stimulating beam, light quanta emitted by screen, light quanta collected
What type of computer defects can occur? Electronic noise, inadequate sampling, inadequate quantization
True/False: CR is a type of digital radiography True
True/False: CR is compatible with film-screen systems True- can use same table and tube
True/False: The imaging plate (IP) does not contain an intensifying screen True- there is no intensifying screen or film in CR
What are the layers of the PSP screen? Protective, Photostimulable phosphor, Reflective, Base, Backing
What is the chemical symbol for the barium florohalide with europium used in the PSP layer? BaFBr:Eu or BaFI:Eu
Why is the light emitted in latent image formation considered a characteristic interaction? because the color of the light emitted is dependent on the atomic structure of the phosphor and ultimately the binding energy of the outer shell electron
The intensity of the x-ray and the intensity of the light phosphor produced have a (direct/indirect) relationship? direct
True/False: Emitted light is monochromatic. False: it is polychromatic; producing many different wavelengths generally colors within the blue/violet region
True/False: Stimulating light is monochromatic. True: Infrared beam produced by the reader that only produces the color red
Infrared light has .......... frequency and ............ wavelength low frequency and long wavelength
Violet light has .......... frequency and ............. wavelength high frequency and short wavelength
Spacial Resolution is inversely proportionate to the: diameter of laser beam and size of PSP
which layer of the PSP plate sends light in a more forward direction when released from the reader? reflective
Created by: rachelreilly