fluoro test 3 maintenance

Fluoroscopy is a type of __, meaning that they are live real time imaging procedures

dynamic

fluoroscopy is the domain of the

radiologist

fluroscopy commonly used for observations of

all

Cardiovascular structures

A surgical procedure

the G.I. track

The fluoroscopic x-ray tube and image receptor are mounted

on a c arm

fluroscopic mA range is commonly _ mA

0.5 to 5.0

During fluroscopy, the SOD on a fixed unit cannot be less than _ inches

15

During fluoroscopic image intensification the primary x-ray beam exits the patient and strikes the __ of the interceptor

input screen

The input screen, absorbs, __ and emits __

x-ray photons, light photons

The photocathode absorbs ____ and emits ____.

light photons, electrons

Electrostatic lenses are used to accelerate and focus

Electrons

What is scotopic vision?

night vision

The output screen absorbs ____ and emits ____.

electrons, light photons

the input screen is __ in shape

concave

The shape of the input screen helps to control

Distortion

The photocathode is composed of ___ metals

photoemissive

Photoemissive materials absorb ____ and emit ____.

light photons, electrons

Electrostatic lens are actually

Charged electrodes

The greater the voltage supply to the electrostatic lens, the __, the acceleration and the __ the focal point to the input screen

Greater, closer

Total brightness gain is

All of the above

a measure of the increase in image brightness intensity

affected by minification gain

affected by flux gain

Who invented the fluoroscope?

Mr. Thomas Edison

Which one of the following is a good option of shielding during upper G.I.

Radiologist

Under image intensifier doctors are using their

photopic vision

The edge distortion problem and image intensification tubes is called

vignetting

The most common solution for quantum mottle is to

Increase the fluro tube mA

during fluoroscopy the principal source of radiation exposure to personnel in the room is the

patient

Flux gain

Deals with the gain, resulting from the conversation of light at the outer phosphor

Mobile fluoroscopic systems are different from fixed system systems and that they

Have a minimum SOD of 12 inches

When using automatic brightness controlled (AEC), it is important to remember that

It affects patient dose by adjusting mA settings automatically

What is the minimum game for an image intensification tube with an input screen diameter of 10 inches in an output diameter of 2 inches

25

What is the total brightness gained for an image intensification tube with the modification gain of 25 and a flux gain of 50

1250

What is the main function of image intensification tube?

Increase brightness level

What is dark adapt?

Need to take 15 minutes to adapt eyes to dark

What is visual acuity to get better visual acuity the brightness level should be higher or low

Accuracy of vision and higher