Radiographic Exposure General Review 1

Front 1

A film that has not been exposed will have a density of 0

Back 1

False

Front 2

The useful range of density in diagnostic radiology is .25 - 2

Back 2

True

Front 3

The steeper the straight line portion of the characteristic curve of a film the greater the contrast

Back 3

True

Front 4

The result of poor screen contact is blurring of the image.

Back 4

True

Front 5

The function of a slow speed screen is to produce fine detail.

Back 5

True

Front 6

The gain in detail is one of the advantages in using intensifying screens.

Back 6

False

Front 7

The intensification factor of screens varies with the thickness of the part to be radiographed.

Back 7

False

Front 8

Quantum mottle is a phenomenon of the x-ray beam.

Back 8

False

Front 9

Dirt on the surface of the intensifying screen will show up as a dark spot on the radiograph.

Back 9

False

Front 10

Screen lag is a desirable intensifying screen action.

Back 10

False

Front 11

Phosphorescence is the emission of light by a crystal after the activating source has ceased.

Back 11

True

Front 12

A high speed screen is used when detail is the most important factor.

Back 12

False

Front 13

A radiograph of a wire mesh screen is a good test for poor screen film contact.

Back 13

True

Front 14

An increase in kV applied to the x-ray tube increases the percentage of higher energy photons.

Back 14

True

Front 15

An increase of 5% in kV will approximately double the exposure.

Back 15

False

Front 16

The exposure rate is directly proportional to the kVp.

Back 16

False

Front 17

The number of electrons emitted by the cathode is primarily dependent upon the heat of the filament.

Back 17

True

Front 18

The speed at which the electrons travel from cathode to anode is dependent upon tube current.

Back 18

False

Front 19

An increase in the kV applied to the tube results in sorter wavelengths.

Back 19

True

Front 20

The image forming radiation that exposes the image receptor is called primary radiation.

Back 20

False

Front 21

The efficiency of a grid is its ability to remove scattered radiation.

Back 21

True

Front 22

Grid ratio is defined as the relationship between the height of the lead strip to the width the strip.

Back 22

False

Front 23

X-ray intensifying screens reduce the amount of radiation needed for an exposure by intensifying x-ray energy

Back 23

False

Front 24

A combination of fast screens and small focal spot would produce the best resolution.

Back 24

False

Front 25

A radiograph that exhibits a short scale of contrast can be described as an image having high contrast.

Back 25

True

Front 26

The function of contrast is to make detail visible.

Back 26

True

Front 27

Radiographic contrast is directly controlled by milliamperage.

Back 27

False

Front 28

Filtration of the x-ray beam affects the half-value layer.

Back 28

True

Front 29

The density of a radiograph is a measurement of the quality of radiation absorbed by the image receptor.

Back 29

False

Front 30

To reduce radiation exposure to the patient and still maintain good radiographic quality one should decrease mAs and increase the kVp.

Back 30

True