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Division of Nuclear Medicine, Department of Radiology, University of Washington, Seattle, Washington
Correspondence: For correspondence and reprints contact: Michael M. Graham, PhD, MD, Division of Nuclear Medicine RC-70, University of Washington, Seattle, WA 98195.
ABSTRACT
A computer controlled blood sampling system was designed specifically for rapid blood sampling for quantitative PET studies and uses solenoids that pinch silastic tubing, a roller pump and an inexpensive fraction collector. The controlling computer is an Apple II plus. The maximum sampling rate is one sample per 2 sec. Typical sample size is 0.90 ± 0.02 g s.d. The loss of blood per sample is 2.6 ml. Tubing dead space is 1.2 ml. The response to a step change in activity between samples is 91% of the expected activity during high-speed sampling and 99% in the slower sampling mode. The major advantage of this device over flow-through detectors is that the blood is available for further processing to measure plasma or metabolite activities. This device has become a useful tool for quantitative PET studies, resulting in reliable sampling, lower radiation dose to personnel and fewer personnel necessary to conduct a study.
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