The first recorded means of measuring physiological dynamics was in the 18th century using madder-root as a bone tracer. Today, to measure and visualize the functioning of in-vivo components is only a matter of tracer choice. The cerebral dynamics is measured with the metastable daughter of Molybdenum-99, Technetium Sodium Pertechnetate. In the decay of 99m-Tc a 140 Kev interval conversion photon is considered in the dosimetry. The means of converting photon events to a visual image is through the Dynacamera. The image detector consists of a collomator, 19 photomultiplier tubes, and a 132-1/2-diameter, 1/2--thick Na(TI) scintillation crystal. Each photomultiplier tube produces a signal descriptive of position and energy photon events by a matrix array. Pulse-height analysis is performed on the signal before it is presented for output display. The final output data may be an isotope photopeak, count rate or information density profile.
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.