Prime Factors

Quantity

100

Radiographic distances are measured from the ____.

focal spot

200

During an x-ray exposure, electrons flow from _________ to __________.

cathode to anode

300

Amperage is the ______________ flowing in a circuit.

Number of electrons

400

Beam QAUNTITY also known as these 3:

–Output

–Intensity

–Exposure

500

An x-ray exposure of 240 mR is recorded at a distance of 40 inches. If the same technical factors are used, what will the exposure be at 72 inches?

74.07 mR

Prime Factors

100

As SID increase, intensity ____.

decreases

200

The glass envelope's primary function is what?

Maintain a vacuum

300

name the 4 prime factors

kVp, mA, time, distance/SID

400

what is the inverse square law formula?

I 1/I 2= (D2/D1)2

I₁/I₂=D₂²/D₁²

500

What is mAs the primary controller over?

density, brightness, exposure

Quality

100

What controls the force of electrons in the tube?

kVp

200

In an x-ray tube, what is the target for the electrons to strike?

anode

300

The number of electrons flowing from cathode to anode is the?

tube current

400

Beam QUALITY also known as these 3:

–Energy

–Penetrability

–Frequency

500

Which four factors have an effect on IR exposure?

mAs, kVp, Distance, Filtration

Intensity

100

When electrons strike the target, what percentage of the kinetic energy will be converted into x-rays?

1%

200

There is a ____ relationship between kVp and beam intensity.

direct

300

The inverse square law states that beam intensity is ____________ _______________ to the square of the distance.

Inversely proportional

400

Exposure time is has a ____ ______ relationship to the number of electrons crossing the tube.

Directly proportional

500

55mAs= 120mA x ________ seconds?

55/120= 0.4483 = 0.45 seconds

IR

100

The primary controlling factor of IR exposure is ____.

mAs

200

If a change in distance is desired, which formula would be applied to keep the exposure the same?

Exposure maintenance formula

300

The amount of exposure to the image receptor should remain the same as long as the intensity and duration of the exposure remain the same. This is known as the ____.

Reciprocity law

400

A  numerical value that is displayed after an exposure, which is compared by the radiographer to an "acceptable" range indicated by the manufacturer.

exposure index

500

An image taken at 75 kVp and 6 mAs produced adequate IR exposure; however, the radiologist requested a higher contrast image. When repeating the image,what technical factors would you use?

15% rule- high contrast= decrease kVp 15% and double mAs  

63.75 kVp and 12 mAs