Unit 5 Physics Mobile and Fluoro

What is the Capacitor-discharge unit portable?

no battery making it lighter

Stores electrical energy released during exposure

Can drop in exposure consistency due to using stored electrical energy

What are some challenges of portable x-ray?

limited space

Light

Patient position

Infection control

What grade ratios are preferred in mobile x-ray?

5:1 to 8:1

Output from battery-operated units is essentially

high frequency

radiographic grids should have a

low ratio and high frequency

What is the difference between the electric image intensifier tube?

convert image into electron beam

Static image

spot image (still view)

What is the automatic brightness stabilization (ABS)?

auto adjust technique during exposure

What is the purpose of the image intensifier tube?

to convert remnant radiation beam into light image

The image intensifier tube contains how many electrical components

5

What diameter is the output philosopher always

2.5cm

If the diameter of the input philosopher decreases, what happens to the pixel size and image resolution?

pixel size decreases, image resolution increases

What is the input philosopher made out of?

fluorescent crystals of cesium iodine

What does the focusing Lens do?

focus the electron beam onto the output phosphor

What is the benefit of CMOS over CCD

lower power consumption

The process of minification is

Using focusing cups to increase output intensity

What is the minification gain formula?

(input philosopher/output philosopher)2

Flux gain formula

# of output Photons/# of electrons

Total brightness gain formula

minification gain x flux gain

How much can dose increase with magnification?

3-4 times