2015.7.12～7.16：AAPM 57th Annual meeting
The 2015 AAPM has been held in Anaheim, USA. Dr. Kadoya and Mr. Nakajima (M2) have attended it for oral presentation. Mr. Sugawara (D2), Mr. Katsuta (D1) and Mr. Nakajima (M2) have attended it for poster presentation.
■Date：2015.7.12～7.16
■Venue：Anaheim Convention Center, Anaheim, USA
■Conference name：AAPM 57th Annual meeting
Noriyuki Kadoya (Assistant professor)
I joined the 57th Annual Meeting of the American Association of Physicists in Medicine (AAPM) held in Anaheim, California July 12 – July 16, 2015. Besides, three graduate students (Sugawara, Katsuta, Nakajima) joined the meeting.
I had oral presentation with title of “Evaluation of Patient DVH-Based QA Metrics for Prostate VMAT: Correlation Between Accuracy of Estimated 3D Patient Dose and MLC Position Error”. Gamma index evaluation has become a standard technique used to compare measured distributions with calculated distributions by a commercial radiation treatment planning system (TPS). Previous studies demonstrated a lack of correlation between conventional IMRT QA methods and dose errors in anatomic regions-of-interest and reported that the gamma passing rate has a weak correlation to critical patient dose volume histogram (DVH) errors. To solve this issue, there has been a growing interest in 3D validation of treatment delivery with IMRT. For 3D validation, dose reconstruction can be performed by several techniques, such as measurement-guided technique with commercially device ArcCHECK or log file-guided technique. The log file-guided technique provides several advantages that a series of procedure in patient-specific QA can be performed with “device-free”, and requires only electric file, so-called log file. In this study, we determined the accuracy of the measurement-guided technique with 3DVH.
In this meeting, we had other small meetings. At the meeting with Varian, I presented our research project about markerless MLC-based tumor tracking using 4D planning. In addition, I joined the 4D-CT ventilation workshop and I could exchange ideas with other researchers (e.g., Prof. Keall at University of Sydney).
