Density

Question 1

Define exposure factors

Answer 1

The factors that influence and determine the quantity and quality of x-radiation to which the patient is exposed.

Question 2

Radiation quantity refers to

Answer 2

Radiation intensity

Units: mR or mR/mAs

Question 3

Radiation quality refers to

Answer 3

X-Ray beam penetrability

Best measured in half-value layer

Question 4

Beam penetrability and quality is controlled by

Answer 4

kVp

Question 5

KVP helps to determines the number of x-rays in the….

Answer 5

Image forming beam.

Question 6

mA determines the number of….

Answer 6

X-Rays produced

Question 7

Short exposure time does what?

Answer 7

Reduces motion blur

Question 8

What factors affect density?

Answer 8

Kvp
MAS
Part thickness
Field size
Grid 
Filters
Distance

Question 9

Distance has no effect on?

Answer 9

Radiation quality

Question 10

If you increase SID, you also need to increase?

Answer 10

mAs

Result of direct square law

Question 11

3 patient factors

Answer 11

Thickness
Composition
Pathology

Question 12

If the patient is thicker, what is required?

Answer 12

More radiation is required to penetrate the patient to expose the image receptor.

Question 13

When only soft tissue is being imaged, what techniques?

Answer 13

Low kVp and high mAs

Question 14

With an extremity, which consists of soft tissue and bone, what technique is adjusted

Answer 14

Low kVp

Question 15

Exposure to IR is called—- in film screen and—–in digital system

Answer 15

Density

Brightness

Question 16

4 Radiographic Qualities

Answer 16

1. Density/brightness
2. Contrast
3. Detail/Spatial Resolution
4. Distortion

Question 17

Factors that impact exposure to the IR, of both F/S and Digital

Answer 17

1. Scatter
2. kVp
3. mAs
4. SID
5. Collimation
6. Thickness
7. Grids
8. Filters
9. Nature of part

Question 18

What does nature of part mean?

Answer 18

Tissue type

Presence or absence of pathology: additive or destructive

Question 19

Controlling factor of density in F/S

Answer 19

mAs

Question 20

3 factors that impact density in F/S

Answer 20

Emulsion characteristics
Intensity Screen characteristics
Chemical Processing

Question 21

What controls contrast/brightness is digital

Answer 21

kVp

Question 22

mAs controls the ? of radiation reaching the film

Answer 22

Quantity

Question 23

Define density

Answer 23

The degree of blackness or opacity of an area in a radiograph due to the accumulation of black metallic silver following exposure and processing of a film.

Question 23

Brightness define

Answer 23

The measurement of the luminance of a monitor calibrated in units of candela (cd) per square meter on a monitor or soft copy. Density on a hard copy is the same as film.

Question 24

Equation for density

Answer 24

Log incident light intensity/transmitted light intensity

Question 25

State the Reciprocity Law

Answer 25

The same Radiographic density or exposure to IR, will result from different mA and time combinations, as long as the mAs totals are equal.

Question 26

ARRT

Answer 26

American Registry of Radiologic Technologists

Question 27

Log 10/1 equals

Answer 27

Density of 1

Question 28

Focal spot is the same as

Answer 28

mA

Question 29

As screen speed increases, the exposure factors must ? In order to maintain original film density

Answer 29

Decrease

Question 30

When SID is doubled, how much do we increase mAs to maintain same density

Answer 30

4 times

Question 31

If the exposure number is in green but High end of DEI, you need to

Answer 31

Cut the mAs in half

Question 32

⬆️quantity of X-ray reaching IR will

Answer 32

⬆️ density

Question 33

Go from 200 mA to 400mA will

Answer 33

⬆️ density

Question 34

If you go from .5 sec to .25sec

Answer 34

Decrease density