Isnt solid water more accurate than acrylic?
A. No. Acrylic delivers the same accuracy as water equivalent materials using the established correction factors published in AAPM Task Group 21. We have simplified the conversion by combining all corrections into one straightforward correction factor that is included with each IMRT Phantom purchased. Acrylic is characterized in this publication for acrylic to water conversion for high-energy photon and electron beams. C. One of the other available water equivalent phantoms is not characterized for each energy, other than for cobalt. Since acrylic is fully known and has published data for its conversion to water, there will be absolutely no inaccuracies of its equivalence once the conversion is applied. Some water equivalent phantoms may only be characterized for cobalt to ascertain their equivalence to liquid water. Since exacting measurements are essential when dealing with the small field sizes in IMRT, it is important to know the true equivalent properties to liquid water that the
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