Preliminaries

Question 1

Reduction / transfer of energy to tissue as it passes through it

Answer 1

Attenuation

Question 2

2 forms of attenuation

Answer 2

Absorption
Scattering

Question 3

Major limitations of radiography

Answer 3

1. Superimposition of anatomical structures
2. Is qualitative rather than qualitative
   (can not discriminate between structure so it cannot quantify the thickness / composition of body types

Question 4

Difference in density or between neighboring regions

Answer 4

Contrast

Question 5

Degree of blackening

Answer 5

Density

Question 6

Ability to distinguish adjacent similar structures because of varying densities

Answer 6

Contrast resolution

Question 7

Degree of sharpness

Answer 7

Spatial resolution

Question 8

Goals of ct

Answer 8

1. Eliminate /minimize superimposition
2. Improve image contrast
3. Recording of very small differences on tissue contrast