110 Unit 3 Sect B
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| attenuation | show 🗑
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| contrast | show 🗑
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| density | show 🗑
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| show | misrepresentation of true size of object
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| dynamic | show 🗑
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| half value layer | show 🗑
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| intensifying screen | show 🗑
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| show | formula desribing relationship betwwen intensity and distance
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| show | measure of electrical pressure, controls quality/quantity of photons in tube
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| show | invisible image after exposure but before processing
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| Milliampere Second (mAs) | show 🗑
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| show | beam ability to pass through object, controlled by kVp
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| penumbra | show 🗑
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| show | particle of radiant energy
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| Positive Beam Limitation (PBL) | show 🗑
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| show | beam before hitting object
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| show | permitting xray passage with little attenuation
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| show | not easily penetrable by xrays
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| recorded detail | show 🗑
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| show | speed of film and intensifying screen, slow film, sharper image and more radiation
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| remnant radiation | show 🗑
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| show | measurement of recorded detail on radiograph, aka sharpness of detail, definition
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| show | photon interacts with matter, goes in different direction, radiation produced
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| show | unmoving
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| show | true border of object as imaged
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| show | density and contrast
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| show | recorded detail and distortion
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| show | mA x time = mAs
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| show | patient factors, kVp, distance, beam modification, grids, film/screen combinations, processing
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| show | increase kVp 15% will double exposuredecrease kVp 15% will halve exposure
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| show | increase kVp 15% and halve mAsdecrease kVp 15% and double mAs
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| inverse square law definition | show 🗑
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| inverse square law formula | show 🗑
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| inverse square law tip | show 🗑
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| show | mAs1/mAs2 = D1squared/D2squared
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| primary beam modification | show 🗑
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| show | range of gray tones; few is high contrast, short scale and vica versa
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| Influencing factors of contrast | show 🗑
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| factors affecting recorded detail | show 🗑
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| show | greater SID better recorded detail
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| OID | show 🗑
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| size distortion | show 🗑
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| shape distortion | show 🗑
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| show | alignment of beam, part and IR
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| show | flouroscopy unit changes to radiographic mode
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| show | positive electode, target, method to accelerate
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| cathode | show 🗑
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| rotor exposure switch | show 🗑
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| ALARA | show 🗑
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| show |
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| show | low energy photon absorbed and released with only a change in direction
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| show | high energy photon strikes end removes electron from shell, remaining energy released as scatter photon, most harmful to RT
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| show | measures the rate a radionuclide decays, 1Ci=3.7 x 10(to the tenth)Bq
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| SI Units | show 🗑
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| Kilelectron Volt (keV) | show 🗑
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| show | interaction between matter and photon having 1.02 million electron volts, producing positron and negatron
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| show | photon strikes inner shell electron ejecting it and absorbing photons energy, most harmful to patient
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| show | tube housing
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| radiation | show 🗑
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| Radiation Absorbed Dose(rad), Gray(Gy) | show 🗑
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| show |
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| show | measures ionization in air
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| show | measures biologic response of exposed individuals to same quantity of differing radiations 1Sv=100rem; Sv is SI unit;1rad=1rem
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| Somatic cell | show 🗑
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| show | electromagnetic radiation traveling at the speed of light with the ability to penetrate matter
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| ionizind radiation | show 🗑
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| show | uranium, radon; we get approx. 295 mrem/yr
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| show | nuclear power, xrays, ect. we get approx. 65mrem/yr
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| properties of xrays | show 🗑
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| absorbtion | show 🗑
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| show | xrays pass through matter with no reaction
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| show | occurs in nuclear industry; energy interacts directly with nucleus, causes excitement, emits nuclear fragment
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