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PalmOS PDA Applications: VolumeA popular basis for brachytherapy QA are the PatersonParker implant tables. These tables were originally designed for radium implants according to the Manchester system (Meredith WJ, ed. Radium dosage. The Manchester System. Edinburgh: Livingston 1967). The data in the original tables gave the number of mg hours required to deliver an exposure of 1000 roentgens (mgh/1000R). These data were based on a value of 0.84 for the exposure rate constant (Γ) for radium. It is common for the original tables to be modified to yield mgh/10Gy by multiplying the original values by the factor C = 0.84 / (0.825 * 0.957) = 1.064 which corrects for the alteration of Γ for radium and converts exposure to dose to tissue. The tables can be adapted for HDR use by converting the original values to a more convenient form for Ir192 (Γ = 0.469) HDR by multiplying the original values by C and then again by H = (0.001 * 3600) * (0.825 / 0.469) = 6.333 to yield mCisec/cGy. The HDR dwell time in seconds is calculated by multiplying the tabulated mCisec/cGy values by the prescribed dose (in cGy) and dividing by the current activity of the source (in mCi). Click here to download the .zip archive: Volume 1.0.0 (20K), last updated 9/8/03. Download: Volume.prc.zip (16K)
