Maintenance Test 3 - Fluoro

fluoroscopy is a type of ___, meaning that they are live, real time imaging procedures

dynamic

fluoroscopy is the domain of the

radiologist

fluoroscopy is commonly used for observation of

a. cardiovascular structures

b. surgical procedure

c. GI tract

d. all of the above

d. all of the above

fluoroscopic mA range is commonly _____ mA

0.5-5.0

the fluoroscopic x-ray tube & image receptor are mounted

on a C-arm

during fluoroscopy, the SOD on a fixed unit cannot be less than ____ inches.

15

during fluoroscopy image intensification, the primary x-ray beam exits the patient and strikes the ______ of the image intensifier

input screen

the input screen absorbs ____ & emits ____.

- x-ray photons

- light photons

the photocathode absorbs ____ & emits ____.

- light photons

- electrons

electrostatic lenses are used to accelerate & focus

electrons

what is scotopic vision?

night vision

The output screen absorbs ____ & emits ____.

- electrons

- light photons

the input screen is _____ in shape

concave

the shape of the input screen helps control?

distortion

the photocathode is composed of ___ metals

photoemissive

Photoemissive materials absorb ____ & emit ____.

- light photons

- electrons

electrostatic lenses are actually

charged electrodes

the greater the voltage supplied to the electrostatic lenses, the ____ the acceleration & the ____ the focal point to the input screen.

- greater

- closer

total brightness gain is

a. a measure of the increase in image brightness

b. affected by minification gain

c. affected by flux gain

d. all of the above

d. all of the above

who invented the fluoroscope?

Thomas Edison

what is a good option of shielding during upper GI?

radiologist

under image intensifier (the II), the doctors are using their _____?

photoptic vision

the edge distortion problem in image intensification tubes is called

vignetting

the most common solution for quantum mottle is to

increase the fluoro tube mA

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

patient

what is flux gain?

deals with the gain resulting from the conversion of light at the output phosphor

mobile fluoroscopic systems are different from fixed systems in that they

have a minimum SOD of 12 inches

when using automatic brightness control (ABC), it is important to remember that

is affects patient dose by adjusting mA setting automatically

What is the minification gain for an image intensification tube with an input screen diameter of 10 inches & an output diameter of 2 inches?

25

what is the total brightness gain for an image intensification tube with a minification gain of 25 & a flux gain of 50?

1250

what is the main function of the image intensification tube?

increase brightness level

what is dark adapt?

15 minute adaptation to dark

what is visual acuity? to get a better visual acuity, the brightness level should be high or low?

visual acuity - accuracy of vision

better visual acuity = high brightness level