Computed Radiography Test
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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| voxel | show 🗑
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| show | image reader device-reads latent image on CR cassette
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| what are some other terms for CR | show 🗑
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| show | *x radiation ionizes europium sites causing them to release free eletrons
*free electrons are moved to a higher energy band called F center
*F center holds electrons in bound state
*# of trapped electrons is equal to absorbed radiation
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| nyquist frequency | show 🗑
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| show | phosphor crystals arranged as needles or columns
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| show | phosphor crystals distributed throughout a phosphor layer
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| europium | show 🗑
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| when should you use a grid | show 🗑
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| show | cannot be penetrated by xrays
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| show | easily penetrated by xrays
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| show | *header with pt name and medical record number, and other pt info, that cannot be edited by RT
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| artifact | show 🗑
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| show | *photomultiplier tube
*photodiode
*CCD
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| show | the higher the scanning frequency, the higer the contrast and resolution
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| show | *use window and level/width
*ROI box
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| ROI | show 🗑
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| MTF | show 🗑
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| banding | show 🗑
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| show | *dust/dirt
*scratches
*pixel malfunction
*gost images
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| software artifacts | show 🗑
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| show | *piercings on pt
*any metal or artifacts on pt
*collimation off
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| speed class | show 🗑
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| show | *unsure of what is on them
*hasnt been used in 48 hrs
*erase twice if double exposed or used on large pt
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| show | *within 1hr to avoid degeneration
-latent image loses 25% of its energy within 8hrs
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| what will happen if you turn tube with grid | show 🗑
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| show | *blue line down if lengthwise
*blue line to your right if crosswise
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| show | *backside *antistatic/backing layer *base *reflective/anti-halo layer *phosphor layer *protective coat/layer
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| what is the backside of the cassete made of | show 🗑
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| antistatic/backing layer | show 🗑
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| reflective/anti-halo layer | show 🗑
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| phosphor/active layer | show 🗑
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| show | *toward tube *prevents handling artifacts *allows cleaning
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| show | carbon or bakelite
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| show | *needle/columnar *turbid
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| what does speed class affect | show 🗑
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| show | to tell the range of exposures that are acceptable
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| what is the first step in the conversion of a latent image to manifest image in the IRD | show 🗑
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| what is the second step in the conversion of a latent image to manifest image in the IRD | show 🗑
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| what is the third step in the conversion of a latent image to manifest image in the IRD | show 🗑
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| what controls contrast resolution | show 🗑
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
bigad1982
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