Experience Using Radiopaque Fiducial Points For Patient Alignment During Radiotherapy

&$I&: Incorporating dally treatment error into the 3-D calculations demonstrated differences between the original and the recalculated dose distributions.Dose volume histograms demonstrated a reduction in coverage of the target volumes by the prescription dose.If an adequate margin to account for daily setup error was incorporated into the PTV then daily variation should have decreased the FTV dose volume coverage but not that of the CTV.Some ~1an.sdemonstrated a decrease in the coverage of both the PTV and CTV.The example below illustrates the consequence of daily vanation in reducing the volume of the CTV receiving greater than 95% of prescribed dose from 96% to 55%.D.. Li,l ,,;.,.II.I>. 1.1 p., I,. 4,.0, ,>, -1 UJ -Recalculated plan -Original plan ~~~I licit :.L.