Abstract
This chapter discusses the common situation in which activity in two paired organs is compared or the activity in one organ at different points in time is compared. The Renal Tubular Secretion Study with Tc-99m-MAG3 includes examples of both: measurement of the percent of total renal function in each kidney is an example of relative comparison at one point in time, and measurement of the change in activity in the renal parenchyma over time is an example of relative comparison at multiple points in time. A defining characteristic of relative quantitative measurements is that they are not affected by the amount of administered dose. Relative measurements, particularly in planar images, are relatively simple compared to absolute measurements because attenuation correction is unnecessary.
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References
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Gastric Emptying Worksheet
Gastric Emptying Worksheet
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Klingensmith, W.C. (2016). Quantitation of Function: Relative Measurements. In: The Mathematics and Biology of the Biodistribution of Radiopharmaceuticals - A Clinical Perspective. Springer, Cham. https://doi.org/10.1007/978-3-319-26704-3_8
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DOI: https://doi.org/10.1007/978-3-319-26704-3_8
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