Test # 3 (Part 1)

Front 1

To provide the radiologist a radiograph of optimum quality with the least exposure.

Back 1

X-ray Production

Front 2

A recorded image, produced by x-rays on photographic film.

Back 2

Radiograph

Front 3

Energy associated with electro & magnetic fields.

Back 3

Electromagnetic Waves

Front 4

Measured from crest to crest.

Back 4

Wavelength

Front 5

What is the symbol for wavelength?

Back 5

λ (lambda)

Front 6

Wavelength is measured in ______.

Back 6

Angstrons Å

Front 7

Short wavelength has _______ energy.

Back 7

High

Front 8

Long wavelength has ______ energy.

Back 8

Low

Front 9

Name all 8 Characteristics of x-rays.

Back 9

1. High energy waves (photons or quantum)
2. No mass
3. No charge (neutral)
4. Travel at the speed of light (186,00 mi/sec or 3x10^10 cm/sec or 3x10^8 m/sec)
5. Are invisible to the human eye
6. Travel in straight lines
7. Cannot be focused with a lens
8. Adversely affect living tissue

Front 10

Number of crests passing a fixed point per. second.

Back 10

Frequency

Front 11

What symbol for Frequency is?

Back 11

ν (Nu)

Front 12

Frequency is measured in ______.

Back 12

Hertz

Front 13

Short wavelength has _______ frequency.

Back 13

High

Front 14

Long wavelength has _______ frequency.

Back 14

Low

Front 15

How are x-rays are produced?

Back 15

When high speed electrons are slowed or stopped suddenly.

Front 16

X-rays produced _____ heat and ________ x-rays.

Back 16

~ 99% ~ 1%

Front 17

Flow of electrons through a conductor.

Back 17

Current (amps)

Front 18

Voltage is also know as ___________ & __________ .

Back 18

* Potential Difference (PD) *Electromotive Force (EMF)

Front 19

__________Current controls the boiling off of electrons.

Back 19

Filament

Front 20

Filament current has ______voltage and ______ amperage.

Back 20

Low
High

Front 21

_______ current controls the current going through the tube.

Back 21

Tube

Front 22

Tube current has ______ voltage and ______ amperage.

Back 22

High
Low

Front 23

Tube current has a range of ___ to ___ kV.

Back 23

20
150

Front 24

1 kV equals ______ volts.

Back 24

1,000

Front 25

_______ controls the Quantity of x-rays.

Back 25

mA (milliamps)

Front 26

What results in a large focal spot and greater heat capacity?

Back 26

Large Filament

Front 27

What results in a small focal spot and less heat capacity?

Back 27

Small Filament

Front 28

What actually adjusts the filament current (boiling off of more or less electrons)?

Back 28

mA Control

Front 29

What measures the tube current, the number of electrons crossing the tube gap during the “exposure”?

Back 29

mA Measurement

Front 30

What is the mAs equation?

Back 30

mA x s = mAs
milliamps x time in sec. = milliampere seconds

Front 31

Length of time electrons are accelerated across the tube gap, or length of time kV is applied is called?

Back 31

Exposure Time

Front 32

________ controls Quality of x-rays.

Back 32

kV (kilovotage)

Front 33

What helps control the fogging effect (absorbs most secondary & increases contrast).

Back 33

Grid

Front 34

What comes from secondary radiation (causes extra density superimposed over expected density).

Back 34

Fogging Effect

Front 35

Long scale equals ________ contrast.

Back 35

Low

Front 36

Short scale equals ________ contrast.

Back 36

High

Front 37

The differences between light & dark areas on adjacent parts of a radiograph. (density differences between adjacent areas).

Back 37

Radiographic Contrast

Front 38

The degree of blackening on an x-ray film.

Back 38

Density

Front 39

kVp is called?

Back 39

Kilovoltage peak