OHIO GXMO STUDY GUIDE REVIEW ACTUAL

OHIO GXMO STUDY GUIDE REVIEW (ACTUAL

(QUESTIONS FROM STUDY GUIDE FROM GXMO

CLASS.) QUESTIONS & ANSWERS RATED A+!!

Thermionic emission - ---Anawers----The process of electrons that are boiled off from the tungsten filament in the xray tube. This occurs when the filament is heated during x- ray exposure, Electrons are then forced into the anode during exposure which creates x-rays

Contrast - ---Anawers----The difference between any two adjacent portions of the image

Attenuation - ---Anawers----Absorption of the X-ray beam by matter

Detent - ---Anawers----Special mechanism that stops the X- ray tube in a specific location.

Grid - ---Anawers----Device that absorbs most of the scatter radiation coming off pt, preventing it from reaching IR.Increases pt exposure.

When to use a grid? - ---Anawers----10-12 cm or more in thickness or when kVp greater than 60 1 / 3

Control console *panel* - ---Anawers----Where the limited operator sets exposure factors and Initiates the exposure

Transformer cabinet - ---Anawers----Used to produce high voltage required for X-ray production

Principle source of scatter? - ---Anawers----The patient

What should the GXMO do before making an exposure? - --- Anawers----Perform a safety check. Make sure the X-ray door is closed. No one in X-ray room. Your completely behind Barrier. No other IRs in the exposure area.

The source of X-rays? - ---Anawers----In a very small area inside the X-ray tube.

Tube is surrounded by - ---Anawers----Lead lined tube housing

Tube housing - ---Anawers----Absorbs *some* scatter

X-rays going in a useful direction exit via the - ---Anawers--- -Tube port

X-Rays from tube port form - ---Anawers----triangular shaped *X-ray beam* 2 / 3

Radiation that leaves the tube: - ---Anawers----Primary

radiation

Image receptor in film consists of - ---Anawers----Film and film holder

IR in computed radiography *CR* - ---Anawers----Cassette and phosphor plate

IR in digital radiography *DR* - ---Anawers----Imaging plate or phosphor plates that go directly to computer console

Artifacts - ---Anawers----Any undesirable densities on the processed image other than those caused by scatter or fog

common types of artifacts - ---Anawers----Operator errors, imaging plate artifacts, plate reader artifacts, image processing artifacts and printer artifacts

Radiographic density - ---Anawers----Overall blackness or darkness of the radiographic image

Correct contrast - ---Anawers----Makes all anatomy more visible neither flat and grey or too black and white. Provides sufficient differences in density to easily make out details in all portions of image.

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