digital images & exposure

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Last updated 7:32 AM on 10/2/26
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13 Terms

1
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digital images

matrix of pixels (picture element) values

2
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what do the values in a pixel represent?

amount of darkness/density displayed

3
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bone color and signal size

white; small signal

4
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soft tissue color and signal size

grey; medium signal

5
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air color and signal size

black; large signal

6
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what is the exposure value dependent on?

manufacturer who set guidelines

7
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what id s the exposure value signified by?

sensitivity number (S)

8
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S number

inversely proportional to radiation striking detector

9
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what does an S number over 400 indicate?

underexposure

10
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what does an S number under 100 indicate?

overexposure

11
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exposure index (EI)

directly proportional to radiation striking the detector

12
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what does an EI lower than 2.0 indicate?

underexposure

13
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what does an EI higher than 2.4 indicate?

overexposure