Ch. 22
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Purpose of intensifying screens is to ______ the beam. | amplify
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| An intensifying screen will ______ pt dose by converting x-ray photons into ______ photons. | reduce; light
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| ____ percent of light photons is included in the latent image, while ____ percent is x-ray photons. | 99; 1
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| _______ emissions is a process in which x-ray photons are converted into ____ ____ and creates a luminescence. | Isotropic; light photons
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| Name the four basic components of the intensifying screens. | Base Reflective Layer Phosphor Protective Coating
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| The phosphor layer is also know as the_________. | active layer
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| As conversion efficiency ______ radiation dose to the patient will _______. | increases; decreases
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| _____ _____ is the ability of the phosphor to emit as much light per x-ray photon interaction as possible is a measurement of the screen SPEED. | conversion efficiency
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| A higher Z# will have what two interactions? | photoelectric and Compton.
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| It is important that the spectral emission match the ______ of the film. (blue & blue) | sensitivity
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| ______ is the ability of a material to emit light in response to excitation. | Luminescence
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| ______ and ______ are the two types of luminescence. | Fluorescence; phosphorescence
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| Fluorescence is _____ emission while phosphorescence is _____ emission. | instantaneous; delayed
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| Delayed emission is sometimes called ____ ____ or _____. | screen lag; afterglow
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| Spectral emission is a precise ______. | wavelength
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| The base on an intensifying screen is ____ & _____. | tough; flexible
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| What does the reflective layer do? | It reflects light towards the film
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| The protective coating protects the phosphor layer against _____. | abrasions/fingernails
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| Conversion efficiency means the more light will result in more ___, ____, & _____. | exposure; speed; density
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| The two phosphors used are ____ _____ and ____ _____. | Calcium tungstate; rare earths.
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| Resolution is measured in _____ per mm. | line pairs
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| Resolution has a _____ relation between size of phosphors. | inverse
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| Large phosphors = _____ resolution | less
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| Poor film/screen contact = _____ in image density. | decrease
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| How do we get rid of quantum mottle? | increase mAs
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| Quantum mottle appears _____ on a radiograph | grainy
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| What happens when a phosphor is struck by an x-ray photon? | Isotropic emission
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| What is the lifespan of phosphors? | 5-7 years
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