CH26 Density_Image Receptor Expose

Question 1

What is the controlling factor for Density?

Answer 1

mAs

Question 2

mAs Formula

Answer 2

Quantity X Length of Exposure

Question 3

Denisty influencing Factor

Answer 3

kVp

Question 4

What does contrast media do?

Answer 4

It affects density, Barium is a substance used it appears white (Radiopaque)

Question 5

Pathology

Answer 5

Study of disease or something not normal.

Question 6

Additive Pathology causes:

Answer 6

An increase in technique

Question 7

Destructive Pathology causes:

Answer 7

a decrease in technique

Question 8

Types of additve pathologies

Answer 8

CHF, Pulmonary edema, Osteopetrosis, Pagets

Question 9

Types of Destructive pathologies

Answer 9

Osteoporosis, emphysema

Question 10

What does a grid do?

Answer 10

Increases contrast but decreases density.

Question 11

Using a grid will require what of technique?

Answer 11

Increase of technique

Question 12

As mAs increases what happens to Density? And what kind of relationship is this?

Answer 12

Increases, this is a direct or linear relatinship

Question 13

Reciprocity

Answer 13

using different mA or time to achieve the same or similar density (mAs).

Question 14

Kiliovotage Controls?

Answer 14

Quality of beam, Force (EMF), Penetrating power, (Potential Difference)

Question 15

Increasing kV does what to densities?

Answer 15

Increases, therefore decreasing contrast

Question 16

15% Rule

Answer 16

Applies to changing kV by 15% in order to double or half Density.

Question 17

When should the 15% rule be used?

Answer 17

When a contast change is desireable, not when only density change is wanted.

Question 18

Increasing kV by 15% will

Answer 18

Increase density by 2.

Question 19

Decreasing kV by 15% will

Answer 19

decrease kV to 1/2

Question 20

The 15% rule is most accurate within what range?

Answer 20

60-100 kV