CR- Bushong Ch. 15
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| What is the principal difference between screen-film radiology and CR? | Analog vs. digital
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| The laser light used in CR has a ............. wavelength than the emitted light. | longer
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| 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
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| An electron is described as being metastable: | Has higher energy than it should have
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| 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)
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| 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)
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| PSP image receptors are effective because: | metastable states are produced
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| About how much time can pass between exposing a CR cassette and reading it before image quality declines? | 8 hours
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| As a descriptor of a PSP, the term turbid refers to an appearance that is: | cloudy
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| True/False: PSP image receptors can be fogged by background radiation | true
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| To remove the image of background radiation or a previous image, one should: | Expose the image receptor to intense white light
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| PSP emit light when exposed to: | exposed to x-rays
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| SPS emit light when exposed to: | exposed to light
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| The photostimulable emission in CR has a ............. wavelength than the laser-stimulating light | shorter
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| The slow scan portion of the CR reader is under .............. control | mechanical
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| spacial resolution in CR is principally determined by: | laser beam diameter
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| the source of the stimulating light is: | the laser
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| How does the CR reader maintain the laser beam as a circle? | beam shaping optics
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| Which of the following is NOT a photodetector? a- ADC b- CCD c- CMOS d- PD e- PMT | a- ADC (analog-to-digital converter)
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| The x-ray capture element of a CR imaging plate is the: | BaFBr (barium fluorohalide)
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| The characteristic curve of a CR imaging plate is described as: | Image receptor response function
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| An advantage of CR over screen-film radiography, regardless of the type of examination, is the relatively constant: | image contrast
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| Patient radiation dose reduction in CR is limited by: | system noise
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| 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
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| True/False: Fewer repeats is an advantage of CR over screen-film radiography | True: due to technique compensation in the computer
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| CR imaging allows for the display of about how many shades of grey? | 10,000 shades of grey
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| Screen-film radiography allows for the display of about how many shades of grey? | 30 shades of grey
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| What are the 3 main sources of image noise in CR? | Mechanical defects, Optical defects, Computer defects
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| What types of mechanical defects can occur? | slow scan driver and fast scan driver
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| What types of optical defects can occur? | Laser intensity control, scatter of stimulating beam, light quanta emitted by screen, light quanta collected
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| What type of computer defects can occur? | Electronic noise, inadequate sampling, inadequate quantization
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| True/False: CR is a type of digital radiography | True
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| True/False: CR is compatible with film-screen systems | True- can use same table and tube
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| True/False: The imaging plate (IP) does not contain an intensifying screen | True- there is no intensifying screen or film in CR
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| What are the layers of the PSP screen? | Protective, Photostimulable phosphor, Reflective, Base, Backing
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| What is the chemical symbol for the barium florohalide with europium used in the PSP layer? | BaFBr:Eu or BaFI:Eu
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| 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
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| The intensity of the x-ray and the intensity of the light phosphor produced have a (direct/indirect) relationship? | direct
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| True/False: Emitted light is monochromatic. | False: it is polychromatic; producing many different wavelengths generally colors within the blue/violet region
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| True/False: Stimulating light is monochromatic. | True: Infrared beam produced by the reader that only produces the color red
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| Infrared light has .......... frequency and ............ wavelength | low frequency and long wavelength
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| Violet light has .......... frequency and ............. wavelength | high frequency and short wavelength
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| Spacial Resolution is inversely proportionate to the: | diameter of laser beam and size of PSP
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| which layer of the PSP plate sends light in a more forward direction when released from the reader? | reflective
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