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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 |