rad 115 test for 9/23

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Last updated 3:58 PM on 9/23/26
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8 Terms

1
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Explain the 15% rule

Because kVp affects both quality and quantity, change of only 15% will cause doubling of exposure

2
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Explain the 15% rule to maintain exposure

a guide to maintain the same image receptor (DD) exposure when kVp changes

  • 15% increase in kVp = 2X mAs

  • 15% decrease=1/2X mAs


3
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Explain the inverse square law and formula

Intensity of radiation at given distance from point source inversely related to square of distance between object and source

4
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Explain the reciprocity law

As long as mAs is constant, any combination of mA and exposure time values will create the same image receptor exposure

5
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Explain the direct square law formula

Provides technique correction for change in SID


6
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Explain the anode heel effect

X-rays are more intense on the cathode side of the x-ray tube because the tungsten target is angled and more x rays get absorbed on the anode side

7
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Formula to find SOD, SID and OID

SID = OID + SOD

SOD = SID - OID

OID = SID - SOD

8
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Whats the formula to find mA time and mAS

mA x seconds = mAs