Digital IR System #9
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| General term for the process of aquiring images of the body using x-rays, displaying them digitally, viewing/storing on a computer | Digital Imaging
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| Stores the image of the body part for Computed radiography | Photo stimuable phosphor plate
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| A cassette less digital x-ray system or flat panel detector | Digital Radiography
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| Two types categories of digital radiography | Indirect conversion, direct conversion
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| In digital radiography the two step process in whic x-ray energy is converted into light, then to an electrical signal | Indirect conversion
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| In digital radiography the process in whic detectors convert x-ray energy directly into an electrical signal or digital signal | Direct conversion
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| A means for adjusting any digital image of a body part with computer software | Post Processing
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| What material is used in a computed radiography imaging plate. | Phosphor
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| To process a CR image you will need: | Computed Radiology reader unit, Computer system with monitors
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| What does ALARA mean? | As low as reasonably achievable
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| After using a CR imaging plate, an image is recovered the plate is erased with: | An intense white light
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| In conventional radiography what items are needed to form an image of a body part? | film and intensifying screens within a cassette
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| What are two common post processing techniques for CR? | Subtraction, Contrast enhancement
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| A post processing technique that can remove anatomy such as bones or organs is called? | subtraction
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| A post processing technique that can change contrast from very high to very low is called? | contrast enhancement
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| What does PACS stand for? | Picture Archival and communication System
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| What does AEC stand for? | Automatic Exposure time
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| Storage phosphors in CR plates are hyper-sensitive to? | scatter radiation
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| If a CR plate is used for two separate exposures, the side not receiving exposure must? | be covered with lead
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| Exposure technique chart must be used when using? | a digital imaging system
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| What should be used for body parts that have extreme difference in tissue density | A compensating filter
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| What will occur in digital systems if there are too few photons reaching the image receptor | Quantum mottle
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| What are the advantages of using CR and digital radiography systems? | The ability to see images quickly, A wide dynamic range is enabled, image density and contrast can easily be adjusted.
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| Aprox. how many times can the phophor plate inside the CR cassette be used before replacing? | 10,000 times
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| The CR digital system image plate is scanned with a _____________ ___________ after being inserted into the reader device. | lazer light
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| Because of wider dynamic range of digital systems, a slightly higher ______ setting may be acceptable for radiography projections using a grid or bucky | kVp
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| The erasure process will begin if the CR cassett is opened and plate is exposed for: | 15 seconds
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| this glows when hit by an x-ray photon | scintillator
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| Once the image is converted to light, the light is converted to an electrical signal, this is called | CCDs Charged Coupled devices
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| A slightly higher ______ setting when using a bucky or grid will reduce exposure time and penitrate better | kVp
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| ___________ __________ must be placed near the center area of the CR plate | Body part
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| The body part and collimated field should always be centered to the _________ __________ when possible | image receptor
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| In CR or DR how may margins should be seen on IR when collimating? | All 4 if possible, but at least 2
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| How long can a CR cassette be opened and exposed to light once the exposure is made with out compromising the image? | less than 15 seconds
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| CR cassette is not light tight but is designed to protect from? | dust, scratches
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| T or False ID markers are not used in CR and DR because they can be easily added with computer software. | False, it is reccomended to use markers while preforming exrays to reduce errors.
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