RADT 311 Intro - FINAL Equations

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Last updated 2:04 AM on 5/16/26
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10 Terms

1
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Find SID

SOD+OID

2
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Find SOD

SID-OID

3
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Find OID

SID-SOD

4
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Unsharpness

Focal Spot Size x OID / SOD

5
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Magnification

Image Size / Object Size = SID / SOD

6
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% of Magnification

Image Size - Object Size / Object Size (then multiply by 100)

7
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Inverse Square Law (intensity)

I1/I2 = D2 squared/D1 squared

8
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Maintenance Formula (Direct Square Law)

mAs1/mAs2 = D1 squared/D2 squared

9
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15% Rule

Increase kVp 15% cut mAs in half or Decrease kVp 15% double mAs

10
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Field Size

mAs1/mAs2 = Field Size1/Field Size 2 (conversions: 14x17 (1), 10x12(1.25), 8x10 (1.40)