QA_Check calculation

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The QA Check document has 1 page. You may optionally set an alert threshold, and, space permitting, include a picture of the plaque with slot index labels.

The QA_Check calculation is an independently coded, simplified version of Plaque Simulator's (PS) full dose calculation in that it assumes the seeds are isotropic point sources in water. This document provides a table of source center coordinates, distances between the centers and a QA Point located 6 mm from the face (concave surface) of the plaque on the plaque's Central AXis (CAX), and all other TG43 parameters required to complete manual confirmation of Plaque Simulator's QA_Check calculation.

Note: In addition to the QA_Check dose calculation, this document also includes a QA_Point dose calculation which applies the full PS dose calculation (e.g. anisotropic linear sources with other various corrections) that is currently being used to calculate dose to the prescription (Rx) point. The QA_Point dose will typically be 3% to 7% less than the QA_Check dose for EP plaques, and may be up to 15% less for COMS plaques due to additional attenuation in the silicone seed carrier compared to water. You can customize the QA_Point/QA_Check ratio (e.g. default is 0.85) that will trigger an alert in the form of a background color change. If the ratio drops below 0.85 the background color will change from green to yellow. At .05 below the threshold the background color will change to red.


When the QA Check document is being displayed in the Document Preview window you may copy the QA table data in Tab Separated Value (TSV) format to the OSX clipboard from the Edit menu for use with other programs.

Example Excel spreadsheet templates for Eye Physics plaques which verify the calculation of the distance (r) from a seed center to the QA point on the plaque axis at (6.0,0.0,0.0) and the resulting QA_Check dose in Gy are installed in the Quality Assurance folder. Simply open the appropriate template in Excel and paste the previously copied TSV data.


You may optionally export the same QA data as a TSV file from the Document Menu for use with other programs or for transfer to another computer.

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