Sensitometry Test
1) A _______ is a device that measures the amount of blackening on a film.
2) A _______ is used to produce a uniform optical step wedge on a film. This is done using light photons, not x-ray photons.
3) List the five stages of a D log E curve.
4) The ability to block or stop the transmission of light on a film is called ________.
5) The optical density range is 0.0 to _______ but diagnostic radiography is best within the range of ________ to ________.
6) A .3 change in optical density changes your opacity by a factor of 2. What does it change if you change your optical density by a factor of 1?
7) T or F: Once D Max is reached it is possible to lose density exposing the film to more radiation?
8) A ________ relationship exists between silver halide crystal size and film resolution.
9) The speed point of a film is where and OD value of ______ + base + fog is achieved.
10) Film speed and the thickness of the emulsion layer are _______ related.
11) Latitude and Contrast are _______ related.
12) ________ is the primary characteristic of film that deals with how accurate the image recorded and is measured with line pairs.
13) The contrast is determined by the slope of a straight line portion. The slope of any point on the straight line can be measured, these points are called ________ points.
Answers
1) Densitometer
2) Sensitometer
3) B + F, Toe, Straight line, Shoulder, D Max
4) Opactiy
5) 4, .5-1.5
6) By a factor of 10
7) True
8) Inverse
9) 1.0
10) Directly
11) Inversely
12) Resolution
13) Gradient
