Possible Bio-Medical Applications of Antiprotons I. In-Vivo Direct Density Measurements: Radiography

We show that antiprotons can be used to extract density at any point within a biological medium by measuring the stopping power. There are no theoretical limits to the accuracy of such a measurement, but practical ones come from data collection capabilities. In addition, radiation dosage may result in a limit of δρ/ρ = 10-2 when the measurements are taken within a volume of approximately 10-2 cm3. Measurements over larger volumes result in substantially smaller errors. The method is illustrated with computer simulated "experiments".