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advanced imaging final 2 old quiz Qs
Question | Answer |
---|---|
What is the lead equivalency of the II in flouro? | 2.0 mm pb eq. |
A “Stepping” unit does what? | allows the x-ray tube to follow a bolus of contrast in CVIT |
In what part of the II is the electronic image formed? | photocathode |
In tomo, where is the fulcrum located? | focal plane |
A fluoroscopic TV operates at what rate? | 30 frames/sec |
What element maintains constant image brightness? | ABS |
Air kerma rate for flouro? | < 10 R/min |
Normal range of flouro tube currents | .5 – 5 mA |
Minimum SSD in stationary flouro: | 15” |
When the II operates at a smaller FOV, what happens to pt. dose and minification gain? | pt dose is increased, minification gain is decreased. |
The input phosphor of the II is composed of what? | cesium iodide |
In flouro leakage radiation shall be: | < 100 mR/hr at 1m at max |
Visual acuity is used for: | fine detail |
Zonography uses what type of tomo angle? | 5 degrees |
The e- beam in a TV camera tube is produced how? | thermionic emission |
Moving the II closer to the pt. in flouro does what to pt. dose and image quality? | decreased pt dose, improved quality |