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Techniques and Errors in Scintigraphic Measurements of Gastric Emptying

The Royal Infirmary, Edinburgh, Scotland

Correspondence: For reprints contact: Peter Tothill, Dept. of Medical Physics, The Royal Infirmary, Edinburgh EH3 9YW, Scotland.

ABSTRACT

For the monitoring of gastric emptying, a gamma camera or scanner operating from one side of the patient is subject to variations of counting efficiency due to the changing depth of radioactivity. A double-headed scanner was used to investigate the effects of such changes. Tc-99m and In-113m were used as labels for the solid and liquid components of a meal. It was found that the depth of Tc-99m within the stomach decreased by a mean of 13 mm during the first half hour of emptying. Anterior detection alone underestimated emptying rates by an average of 26%. Depth changes also introduced errors into "early emptying" measurements made unilaterally. Such artifacts of measurement may compromise mathematical analyses of emptying patterns.

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