| 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 |
Cardio Block2anatomy
