advanced imaging - CT set 1
Help!
|
|
||||
|---|---|---|---|---|---|
| Narrow window width produces what? | short scale
🗑
|
||||
| Wide window width produces what? | long scale
🗑
|
||||
| Window allows the viewer to alter what? | contrast
🗑
|
||||
| Window level controls what? | density
🗑
|
||||
| Window width controls what? | contrast
🗑
|
||||
| BUN number range for contrast: | 7-18
🗑
|
||||
| Creatnine number range for contrast: | .6-1.5
🗑
|
||||
| A “viscous” material is: | thick
🗑
|
||||
| CTDI | dose to pt within the primary beam
🗑
|
||||
| MSAD | average dose pt receives during an exam
🗑
|
||||
| Noise in CT is: | the variation in CT numbers above and below 0
🗑
|
||||
| Linearity: | calibration of CT scanner so that water = 0
🗑
|
||||
| Most important component of the CT QC program is: | spatial resolution test (bar or hole pattern)
🗑
|
||||
| Laser localizer for CT should be how accurate? | to within +/- 1mm
🗑
|
||||
| How does pt dose change with slice thickness? | thinner slices = more pt dose
🗑
|
||||
| Scintillation | detector made of crystal with 50% detector efficiency. Most common.
🗑
|
||||
| Pre-patient collimation controls: | pt dose
🗑
|
||||
| Postpatient (pre-detector) collimation controls: | slice thickness
🗑
|
||||
| How must the CT computer be stored? | in a cool dry place, under 68 degrees and 30% relative humidity
🗑
|
||||
| Formula for pixel size | FOV / matrix size
🗑
|
||||
| Formula for voxel | pixel size X slice thickness
🗑
|
||||
| CT numbers +1000 represent : | hard bone
🗑
|
||||
| CT numbers -1000 represent: | air
🗑
|
||||
| Ct numbers 0 represent : | water
🗑
|
||||
| CT number range for lung tissue: | -250 to -850
🗑
|
||||
| CT number range for blood fluid: | +25 to +50
🗑
|
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.
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.
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.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
annaluz87
Popular Radiology sets