ch 25 digital rad
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| show | cassette base, cassette less
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| show | cassette base
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| show | True
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| Computed radiography is considered | show 🗑
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| show | direct digital
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| A system that uses a two part process involving a scintillator and a photodetector is called | show 🗑
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| A system that directly convert incoming x-ray photons to an electronic signal is called | show 🗑
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| show | photostimulable
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| The photostimulable phosphor imaging plates layers include | show 🗑
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| Which photostimulable phosphor layer insulates the imaging plate from handling | show 🗑
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| In order for CR to function, the imaging plate material must have the ability to___and____the image in formation in a usable form. | show 🗑
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| show | bromide, iodine
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| show | barium flurohalide bromide, iodides with europium activators
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| What does not release all the energy absorbed from the incident x-ray beam | show 🗑
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| Although some light is emitted, the phosphors retain sufficient energy in the form of a | show 🗑
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| show | photoelectric interaction
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| The latent image will lose about ___ % of its energy in __hrs | show 🗑
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| Image acquisition begins with x-ray exposure to the | show 🗑
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| show | Fluorescence
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| show | wider latitude
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| Reading the imaging plate involves a finely focused laser beam that frees the trapped____, allowing them to return to a_____ energy state | show 🗑
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| Residual image left on the imaging plate is erased by exposure to an____ ___ to release any remaining trapped electrons | show 🗑
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| show | reading, erasing
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| The finely focused laser beam that scans each line of the imaging plate correlates to one | show 🗑
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| The number of ___ determines and affects the density and contrast of an imaging system | show 🗑
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| show | orientation, projections
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| raw data from scanning will have a range of values related to how much__ the plate received. | show 🗑
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| show | lowest
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| The area within the collimated field will have the____ values | show 🗑
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| T/F A marker placed outside the collimation field will appear in the processed image. | show 🗑
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| show | T
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| show | F
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| During initial processing what is created form the image data | show 🗑
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| show | minimum, maximum
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| T/F Image processing will provide the proper gray scale, regardless of variations in kvp and mas | show 🗑
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| The appropriate anatomical menu is selected by the body part by the _ when the imaging plate is loaded into the reading unit. | show 🗑
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| show | Density, contrast
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| It is critical to adhere to uniform positioning and collimation procedures when using a CR system. | show 🗑
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| T/F The reading system must be given consistent data to analyze if it is to provide consistent diagnostic quality results. | show 🗑
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| New generation CR readers store the _ data in the workstation. | show 🗑
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| show | Mas
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| show | higher
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| show | wider dynamic range
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| Conventional films allows mistakes if a wrong radiographic technique is used: | show 🗑
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| show | good image
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| show | conventional
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| ____ can be easily transmitted through networks and archived | show 🗑
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| makes anatomic structures more visible and distinguishable | show 🗑
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| results in smoothing of the structures | show 🗑
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| show | use windowing and leveling within this same image to see the various structures with different levels of density and contrast, Magnification of the entire image or specific structures
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| show | High KVP
No grid or inadequate grid efficiency
Inadequate beam limitation (i.e., collimation)
Increased part size or tissue thickness
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| show | KVP
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| show | wide dynamic range
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| show | fogging, from both scatter and background radiation
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| show | exposure error increases, image quality will decrease!
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| Basic principles regarding the production of poor____ when using film/screen do not change with the use of digital | show 🗑
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| show | wider latitude
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| show | MAS
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| show | grainy, reticulated image for which digital post processing cannot compensate
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| Adequate___ is required to activate any digital image receptor! | show 🗑
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| show | sensitivity number,index number
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| Underexposures in digital results in a “too noisy” image or | show 🗑
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| Overexposures in digital___ be detected unless patient dose measurements are performed | show 🗑
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| Over exposure in digital yields good images with unnecessary but | show 🗑
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| Over range of digitizer (extreme over exposure) may result in___ with potential loss of information | show 🗑
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| A lack of sufficient incoming data to process an image: | show 🗑
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| show | Digital Radiography utilizes a reusable detector
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| Digital Radiography can be divided into two groups: | show 🗑
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| show | Photostimulable Phosphor Imaging Plates
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| The layers of a plate (PSP or IP) include: | show 🗑
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| insulates from “handling trauma” | show 🗑
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| active component” photostimulable phosphor | show 🗑
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| the base on which to coat the other layers | show 🗑
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| show | conductor layer
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| prevents light from erasing data on the imaging plate or leaking through the backing | show 🗑
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| In order for CR to function, the imaging material must have the ability to__ and__the image information in a usable form. | show 🗑
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| show | low-energy scatter
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| The imaging plate is more sensitive to scatter both__ and___it is sensitized through exposure to the x-ray beam. | show 🗑
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| what begins with an x-ray exposure to the imaging plate. | show 🗑
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| show | fluorescence,energy
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| The latent image is stored within the____, similar to a latent image on film, but with wider___ | show 🗑
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| show | latent image,
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| show | photostimulable phosphor luminescence
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| The imaging plate is scanned by a___ laser beam | show 🗑
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| These laser beam scan causes the phosphors to emit the stored latent image in the form of | show 🗑
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| These light photons are detected by the photosensitive receptors and then converted to an | show 🗑
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| This electrical signal is, in turn, converted to a unique digital value for that particular level of | show 🗑
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| show | laser beam,electrons
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| After reading the imaging plate the electrons to return to a | show 🗑
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| show | light photons
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| show | electronic signal
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| show | digital signal
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| show | spacing,pixel
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| It is recommended that CR plates be erased____, if not used, to eliminate unwanted noise. | show 🗑
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| the degree of geometric sharpness or accuracy of recorded detail of the structure | show 🗑
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| The smaller the pixel, the___ the spatial resolution. | show 🗑
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| show | beam,part
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| a graphical representation or diagram that is generated by dividing a scanned area into pixels and determining the signal intensity for each pixel. | show 🗑
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| The shape of a histogram will correspond to the specific__and__ used for an exam. | show 🗑
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| Kilovoltage for computed radiography will control____ similar to film radiography | show 🗑
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| The Fuji computed radiography (CR) system uses an S number to assist in evaluating exposure and are | show 🗑
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| Kodak’s CR indicator system is called the Exposure Index and It is directly proportional. | show 🗑
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| Most CR systems do not send all the data acquired by the image receptor to the post-acquisition system because some data represents exposure below the diagnostic imaging range, while other data represents exposure far above the diagnostic range | show 🗑
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| post-processed by algorithms that eliminate the overexposed portion of the image receptor output | show 🗑
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| a compound that absorbs x-rays and converts the energy to visible light by fluorescence | show 🗑
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| A good scintillator yields many light photons for each incoming x-ray photon; __ to __ visible photons out per 1kV of incoming x-ray energy are typical. | show 🗑
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| Scintillators usually consist of a___ number material, which has high x-ray absorption. | show 🗑
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| show | granular
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