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RADD 2501 Formulas - Inverse Square & Direct Square Laws

RADD 2501 Formulas - Inverse Square & Direct Square...

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mAs and Distance and Density Direct Square Law The amount of milliamperage and time needed to produce a given radiographic density varies directly with the square of the distance. Original mAs Original SID 2 new mAs = new SID 2 Easy to remember if doubled or halved: If SID is doubled: use 4 x the original mAs If SID is halved: use ¼ of the original mAs
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Unformatted text preview: Density and Distance Inverse Square Law A change in beam intensity varies inversely with the square of the source image distance. Original Intensity New SID 2 New Intensity = Old SID 2 Easy to remember if doubled or halved: If SID is Doubled: Intensity 1/4 original If SID is halved: Intensity is 4x original...
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