Chapter 9 Fosbinder
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | The study of the relationship between from the amount of intensity from tube and amount of density on the film
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| show | 1. Speed
2. Exposure Latitude
3. Contrast
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| What will always be on the film? | show 🗑
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| Equipment is needed for sensitometry? (2) | show 🗑
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| show | Piece of aluminum with varying densities in the shape of a step wedge.
Step 1- black (X-rays pass through, thinest step)
Step 11- white
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| show | A device that is designed to expose a reproducible, uniform, optical step wedge onto a film.
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| show | Sensitometer
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| show | A device used to numerically measure the amount of blackness on the film after processing.
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| show | The amount of light that is actually transmitted through the film.
it x 100
io
***only have to recognize formula***
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| show | The numerical calculation of transmitted light through a film to incident light originally striking the film.
Log10 (io)
(it)
OD ranges 0-4
0 = white part of the image 4 = black part of an image
**only have to recognize formula **
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| show | Increased optical density (more black) = decreased light transmittance
Decreased optical density (more white) = increased light transmittance
OD increases by .3 and decreases light by 1/2
OD decreased by .3 and increases light by double
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| show | A graph demonstrating how a film respond to a series's of increasing exposures.
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| show | 1. Toe
2. Threshold
3. Straight-line region/ slope/ gamma
4. Average gradient
5. Shoulder
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| What is the toe of the curve? | show 🗑
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| What is base + fog? | show 🗑
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| show | On any blank unexposed part of the film.
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| What is the threshold of the curve? | show 🗑
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| What is the straight line region (slop/gamma)? | show 🗑
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| show | 0-4
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| What is the useful range of optical density on a graph? | show 🗑
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| What is the diagnostic range of optical density on a graph? | show 🗑
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| show | The point on the curve where the maximum density have be produced. Most amount of black. (Dmax)
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| What is average gradient? | show 🗑
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| What is solarization? | show 🗑
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| show | 1. Film Speed
2. Film Contrast
3. Exposure Latitude
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| show | The films sensitivity to radiation, and indicated the amount of optical density produced for a given radiation exposure.
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| show | The point on hype sensitometric curve that corresponds to the optical density of 1.0 + B + F
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| What is the speed exposure point? | show 🗑
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| What is film contrast controlled by? | show 🗑
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| show | More vertical.
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| show | Low
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| show | Rise Or Y2-Y1
Run X2-X1
High number = steep slope = high contrast
Low number = long slope = low contrast
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| What is exposure latitude? | show 🗑
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| show | It is achieved when radiographic densities are produced that lie within the straight-line region of the curve thus maximizing the amount of information visible.
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