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CRDR Final Exam Review Questions & Answers 2024/2025
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CRDR Final Exam Review Questions & Answers 2024/2025 Conventional Radiography uses _________and _______ in the image formation process - ANSWERSFilm intensifying screens Intensifying Screens __________ when x-rays strike them - ANSWERSemit light Analog Film's manifest image is processed...

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  • November 22, 2024
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  • 2024/2025
  • Exam (elaborations)
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CRDR Final Exam Review Questions &
Answers 2024/2025

Conventional Radiography uses _________and _______ in the image formation process - ANSWERSFilm

intensifying screens



Intensifying Screens __________ when x-rays strike them - ANSWERSemit light



Analog Film's manifest image is processed how? - ANSWERSchemically



Digital Imaging - ANSWERSType of imaging acquisition process that produces an electronic image that
can be viewed and manipulated on a computer



Teleradiology - ANSWERSTransmission of medical images and reports to and from remote sites



Photostimulable Phosphor Plate (PSP) - ANSWERSThe active image receptor used in computed
radiography (CR) whose phosphor layer can be induced to emit its STORED light image, after initial
exposure to x-rays, by re-stimulating it with a laser beam.



T/F: PSP can be cassette-less or cassette-based - ANSWERSTrue



T/F: PSP can store a portion of incident x-ray energy in traps within material for later readout. -
ANSWERSTrue



PSP was first introduced by what brand in the US? - ANSWERSFuji



PSP: Cassette-based falls under what category? - ANSWERSCR



PSP: Cassette-less fall under what category? - ANSWERSDR

,Film/screen falls under what category? - ANSWERSAnalog



Flat Panel Detector (FPD) - ANSWERSconsist of a photoconductor, amorphous selenium, which holds a
charge on its surface, that can be read out by a TFT.



FPD fall under which category? - ANSWERSDR



CR is a ___ step process - ANSWERS3



DR is a ___ step process - ANSWERS2



Indirect capture DR - ANSWERS-absorb x-ray and convert it into light

-the light is then collected by a CCD or TFT or CMOS array and converted into an electrical signal

-electrical signal is then sent to computer for processing



Direct capture DR - ANSWERS-devices convert the incident x-ray energy directly into an electrical signal,
typically using a photoconductor as the X-ray absorber

-then the electrical signal is sent to a TFT and then to an ADC

-The ADC signal goes to the computer for processing and viewing



What is the activator in PSP systems? - ANSWERSeuropium



Latent Image formation: Analog - ANSWERS-x-rays strike intensifying screen

-light is emitted

-and film is exposed to light



Latent Image formation: PSP - ANSWERSX-rays strike phosphor plate

-x-ray energy deposited in the phosphor

, -energy is released from phosphor when stimulated by light in reader



Latent Image formation: FPD (Indirect) - ANSWERS-x-ray strikes detector

-phosphor emits light (silicon and TFT)

-detects light and converts it to electrical signal



Latent image formation: FPD (direct) - ANSWERS-x-ray strikes detector

-x-rays detected by photoconductor and converted to electrical signal



Converts Light into electrons: - ANSWERSphotodetector



What is the definition of amorphous? - ANSWERSa non-crystalline state of an otherwise crystalline
material



_____________ releases electrons when struck by light photons

and _____________ releases electrons when struck by x-ray photons - ANSWERSAmorphous s(I)licon
and amorphous S(e)lenium



What is the advantage of film/screen over digital? - ANSWERSbetter spatial resolution



A numerical value that is representative of the amount of radiation that strikes the digital image receptor
is termed: - ANSWERSexposure indicator



Highly complex mathematical formula: - ANSWERSAlgorithm



Random disturbance that obscures or reduces clarity is the definition for: - ANSWERSNoise



Adjusting the window level or window width is known as: - ANSWERSWindowing

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