IP
convert remnant radiation into an electrical signal
a back-up timer should be set at _______ of the anticipated manual exposure time?
150%
What is the formula to calculate total heat units (HU)?
HU= kVp x mAs x factor
What is the formula for total resistance in a parallel circuit?
1/RT= 1/R1 + 1/R2 + 1/R3
what are the three main parts of the x-ray circuit?
1. primary or low voltage circuit
2. secondary or high voltage circuit
3. filament or low voltage heating circuit.
what does the electrical signal form in DR?
an electronic latent image
what is minimum response time (MRT)?
the time it takes for a system to respond and send the signal to terminate the exposure.
what are the HU factors?
1. single phase= 1.0
2. three phase-6 pulse= 1.35
3. three pase-12 pulse= 1.41
4. high frequency= 1.61
What is a quick shortcut tip for parallel resistance problems?
use the smallest resistance number, and divide it by 2
where is the AC supply located in the x-ray circuit?
on the primary side (low voltage circuit)
the image matrix consist of _________?
cells in rows and columns.
What is the formula for Ohm's Law?
V=IR
V= voltage or electric potential
I= current measured in amperes
R= resistance measured in Ohm's
how are the components arranged in a parallel circuit?
how are components arraigned in a series circuit?
in line with one another.
what voltage does the AC supply provide to the x-ray unit?
220-240 volts
what is the purpose of a back-up timer?
determines the maximum length of exposure time for an AEC exposure.
How do you convert milliseconds (ms) to seconds?
ms x 1000
maximum voltage in a parallel circuit is _________?
equal to the greatest single volt producing device.
what is the formula for calculating total voltage in a series circuit?
Vt= V1 + V2
what type of current is supplied to the x-ray unit?
Alternating current (AC)
a back-up timer is not intended to be the primary means for terminating an exposure, but it does provide a _______?
a level of protection for the patient in the event the AEC fail to terminate the exposure
how do you convert seconds to milliseconds?
S / 1000
if one branch has 6 volts, and another has 12 volts, what is the total voltage?
12 volts
What is the formula for calculating total resistance in a series circuit?
Rt= R1 + R2 + R3
what is the primary function of a transformer?
to convert low voltage (220 volts) into high voltage (kilovoltage) needed to produce x-rays.