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