Radreview Sec4 1&2

Question 1

Using a multifield ii tube, which of the input phospher diameters will req the highest pt dose? Choose the lowest diameter opposed to the higher.

Answer 1

Multifield or trifold IIs are designed this way to allow for magnification.
As voltage is applied to electrostatic focusing lenses the focal point moves back towards the input phospher decreasing the FOV, mag increases creating better spatial resolution

Question 2

A phospher is what?

Answer 2

Converts XRs to light photons

Question 3

An advantage of a battery operated mobile XR unit

Answer 3

It drives itself with some of the stored energy

Question 4

CT machine tube uses the following

Answer 4

Uses a pulsed XR beam using 1-5ms and up to 1000mA.