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Imaging Adler CH 6&7
| Question | Answer |
|---|---|
| Protective layer of gelatin that provides sturdiness and reduces damage (film) | supercoat/overcoat |
| film layer that holds and forms the latent image and is composed of silver halide crystals | emulsion layer |
| what are the types of silver halide crystals | silver bromide (AgBr),silver iodide (AgI) |
| What is the shape of crystal that absorbs more photons, uses a thinner emulsion, and speeds up processing? | tubular crystal |
| what film layer hold emulsion in place, allows even distribution, and is a seperate suspension of silver halide crystals | Gelatin layer |
| which film layer is the foundation of the radiograph and made of polyester | film base |
| what does blue tint do? | contributes to base fog but helps with eye strain |
| blue tint is found in which film layer? | film base |
| which film layer binds emulsion to film base and acts as the "glue"? | Adhesive layer |
| What year was the Gurney Mott Theory developed? | 1938 |
| how fast you make a latent image | speed |
| Increase in crystal size, ____ speed, ____ resolution | increase, decrease |
| Increase in layer thickness, ____ screen speed, ____ resolution | increase, decrease |
| scale that a diagnostic image can be produced at | Exposure latitude |
| high contrast films have ________latitude low contrast film has ________ latitude | narrow, wide |
| the ability of a radiographic film to provide a certain level of image contrast | film-screen contrast |
| the measurement of the characteristic response of film to exposure and processing | sensitometry |
| what are the 4 names of the density curve produced by graphing the exposures of a penetrometer exposure | D log E curve, H&D curve, characteristic curve, sensotomic curve |
| blue tint has ____ OD | .2 |
| QC for processor | sensitometer |
| instrument that provides a read out of the amount of blackness on a film | Densitometer |
| what is the diagnostic range of OD? | 0.50 and 2.0 |
| intensifying screens were invented by __________ in _______ | Thomas Edison, 1896 |
| over ____% of the latent image is formed by the light from the screen; less than ____% is formed by the incident photons | 99%, 1% |
| gannaliteum is __________ | green light |
| if not spectroly match you need to increase _______ | time (mAs) |
| why are rare earth phosphors used? | high atomic #, found in nature, high resolution |
| What is an intensifying screens main purpose? | to amplify / light up photons |
| a chemical compound that emits visible light when struck by radiation | phosphor |
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