Abstract
A practical and functional design is presented for the storage of radioisotope indicator concentration data in digital form on FM analog magnetic tape. The converter is designed to utilize the 12-bit parallel binary output of a Baird Atomic Digital Ratemeter (Model 425) which is converted into a 4 line 1–2–4–8 binary-coded-decimal (BCD) pattern suitable for recording on any multichannel FM instrumentation tape recording. The output levels are set at ± 1 volt compatible with Laboratory Instrument Computer (LINC) external line logic levels. The LINC is used to process the digital ratemeter data on-line and off-line in experiments dealing with tube models and anesthetized animals in which the mean transit time ( MTT), appearance time ( T Λ ), flow ( Q ̇ ) and volume ( V) are computed. The stability and reproducibility of the experimental digital data stored in this form far exceeds that of equivalent analog data. This design should further extend the accuracy of blood-flow and cardiac-output determinations using radioisotope indicator-dilution techniques.
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