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Abstract--A rubidium-82 (82 Rb) elution system is described

Summary: Abstract-- A rubidium-82 (82
Rb) elution system is described
for use with clinical positron emission tomography. The system
is self-calibrating with 1.4% repeatability, independent of
generator activity and elution flow rate. Saline flow is switched
between a 82
Rb generator and a bypass line to achieve a
constant activity elution of 82
Rb. In the present study, pulse
width modulation (PWM) of a solenoid valve is compared to
simple threshold control as a means to simulate a proportional
valve. A predictive-corrective control algorithm is developed
which produces a constant activity elution within the
constraints of long feedback delay and short elution time.
Accurate constant-activity elutions of 10-70% of the total
generator activity were demonstrated using the threshold
comparison control. The adaptive-corrective control of the
PWM valve provided a substantial improvement in precision of
the steady-state output.


Source: Adler, Andy - Department of Systems and Computer Engineering, Carleton University


Collections: Computer Technologies and Information Sciences