Program Information

Comprehensive End to End Data Transfer Integrity Check of Delivery Parameters Using TrueBeam Trajectory Log Files Analysis

B Sun*, D Rangaraj, D Yang, S Yaddanapudi, G Palaniswaamy, H Wooten, S Mutic, L Santanam, Washington University School of Medicine, Saint Louis, MO

SU-E-T-36 Sunday 3:00:00 PM - 6:00:00 PM Room: Exhibit Hall

Purpose: Traditional manual quality assurance checks of a patient treatment plan beam parameters transfer involve visually checking the information printed from the treatment planning system against the record-and verify system for one-to-one correspondence. To provide the efficiency and accuracy of data transfer check, we have utilized the Varian TrueBeam log files which contain the complete delivery parameters.

Methods: The approved plans are transferred to the Record and Verify (R&V) system, and the beams are delivered in the Truebeam Linac. The expected and actual status of TrueBeam delivery parameters are recorded during the delivery. Compared to traditional dynalog files from Varian, TrueBeam log files offer complete delivery parameters, which enable complete data transfer QA. An automatic program was designed to read the planned parameters from TPS and delivered parameters from Linac workstation. The program can verify the delivered parameters for all the external deliveries, including 3D conformal, EDW delivery, IMRT, VMAT, and electrons treatments.

Results: The patient ID, beam ID, photon or electron energy, beam MU, gantry angle, couch angle, cough positions, collimator angle, jaw positions, EDW wedge angle and orientations, MLC positions, number of segments, gantry speed, dose rate, applicator size are all checked. The data transfer and/or delivery errors are flagged in the report for each type of delivery.

Conclusion: The end-to-end data transfer check using TrueBeam log files provides an efficient, reliable and complete beam parameter plan check process for variety of radiation delivery technique. It is more efficient than human chart checking and improves the robustness and quality of chart checking.

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