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Nuclear Medicine Technology

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Nuclear Medicine Imaging
and Function Studies
of the Gastrointestinal System

Calculation of the Geometric Mean

The geometric mean is the square root of the product of the anterior and posterior counts.

Geometric Mean = square root (anterior counts x posterior counts)

For example, assume the anterior counts collected for an image taken one minute after the patient finished consuming the standard meal were 102 764 cpm while the corresponding posterior counts collected were 128 842 cpm. The geometric mean is calculated as:

Geometric Mean = sqrt (102 764 x 128 842)
= sqrt (1.32403 x 1010)
= 115 067 cpm

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Gastric Emptying

Last revised October 30, 2000 by Lyle J. Goodin, BSc, MRT(N), ACNM
Comments, suggestions or questions??? Please address them to Lyle Goodin at:
email lgoodin@idirect.com or
lgoodin@staff.michener.on.ca