Fluoroscopy Actual Exam Fluoroscopy

Fluoroscopy Actual Exam Fluoroscopy Exam Latest Update Questions and Correct Answers Rated A+

How is fluoroscopy used in angiography? -ANSWER-To position the system for the recording of images of contrast material being injected via catheter

How is fluoroscopy used in angioplasty? -ANSWER-To provide imaging guidance for interventional procedures?

Three types of fluoroscopy cameras -ANSWER-analog vidicon, CCD or CMOS (Complementary metal-oxide semiconductor)

"Real time" imaging frame rate -ANSWER-30 fps, about the same as old analog TVs

Who invented the fluoroscope? -ANSWER-Thomas Edison

When was the fluoroscope invented? -ANSWER-1896

What are the two types of light receptors in the eyes? -ANSWER- Rods and cones

Which type of vision requires bright light or daylight? -ANSWER-Cone vision/photopic

Which vision has excellent spatial resolution? -ANSWER-Cone vision

Which type of vision requires dim light or complete darkness - ANSWER-Rod vision/ scotopic vision

Which vision is color blind? -ANSWER-Rod vision

Who invented the image intensifier? -ANSWER-Bell laboratories

Why was the image intensifier made? -ANSWER-To increase brightness of image so that the image could be viewed with cone vision

What is fluoroscopy? -ANSWER-Dynamic imaging modality designed to observe moving structures in the body

When is fluoroscopy currently used? -ANSWER-For examinations that require observation if physiologic functions such as the movement of barium through GI tract

What are the rooms that also have an overhead tube for conventional radiography called? -ANSWER-"R and F" rooms

What are typical fluoroscopic tube currents? -ANSWER-0.5 to 5 mA

What does a radiographic tube current operate at? -ANSWER-50 to 500 mA

For fluoroscopy what type of mA and kVp is usually used? -ANSWER- High kVp low mA

Where is the fluoroscopic tube usually located? -ANSWER-Beneath the patient support table

The source to skin distance if a fixed fluoroscopic tube must be at least what? -ANSWER-38 cm (15 inches)

For a c-arm the source to skin distance must be at least? -ANSWER- 30 cm (12 inches)

How much lead equivalent must the lead drape of the image intensifier tower be? -ANSWER-0.25 mm lead equivalent

Where is the tv camera mounted? -ANSWER-On top of the image intensifier tower

Where is the tower connected? -ANSWER-To the x-ray tube mount

What does the image intensifier do? -ANSWER-Increases brightness of image

How much can modern image intensifiers increase brightness? - ANSWER-8000 times

What does the input screen do? -ANSWER-Absorbs x-ray photons and emits light photons

What does the photocathode do? -ANSWER-Absorbs light photons and emits electrons

Where are the electrons accelerated from the photocathode move to?-ANSWER-Toward the anode and output screen

What focuses the electrons? -ANSWER-Electrostatic lenses

What does the output screen do? -ANSWER-Absorbs the electrons and emits light photons

What is the input phosphor made of? -ANSWER-Glass, titanium, steel or aluminum and coated with cesium iodide crystals

Why are cesium iodide crystals used? -ANSWER-They have high x- ray photon absorption and light emission characteristics

How big is the input phosphor? -ANSWER-10-35 cm in diameter

How much exit radiation leaving the patient does the input phosphor absorb? -ANSWER-About 66%

What does the concave structure of the input phosphor do? - ANSWER-Enhances sharpness of the image

What is the phenomenon called when photoelectrons of the photocathode are stuck by light? -ANSWER-Photoemission

Where are the electrostatic lenses located? -ANSWER-Along the inside of the photocathode

What range of kVp charges the electrostatic lenses? -ANSWER-25-35 kVp

What does the concave structure of the photocathode do? -ANSWER- Reduces distortion by maintaining distance between all points on the input screen and output phosphor

What is the focal point? -ANSWER-The precise location where the photoelectrons cross