A systematic approach to patient specific QA for volumetric modulated arc therapy (VMAT) Conference Paper

  


Authors: Song, Y.; Obcemea, C.; Mueller, B.; Mychalczak, B.
Title: A systematic approach to patient specific QA for volumetric modulated arc therapy (VMAT)
Conference Title: 2012 World Congress on Medical Physics and Biomedical Engineering
Abstract: We developed the first non-commercial treatment planning system for volumetric modulated radiation therapy (VMAT) in the United States. Because VMAT involves multiparameter modulations, it is imperative to develop a comprehensive, rigorous and yet, practical procedure for routine patient-specific quality assurance (QA). In this paper, we present our own approach as being currently implemented in our institution. Our patient-specific QA procedure involves multi-levels: pre-treatment QA, on-treatment QA, and posttreatment QA. The pre-treatment QA focuses on dosimetry verification. It is done with the commercial MapCHECK in MapPHAN mounted on an isocentric mounting fixture (IMF). This method is also referred to as the fixed-gantry technique, i.e., the beams always remain perpendicular to the detector plane. The on-treatment QA involves in-vivo optically stimulated luminescent dosimetry (OSLD). Prior to the treatment, two nanoDot TM OSLD dosimeters are placed on the patient abdomen under 1 cm bolus at the isocenter location. The irradiated dosimeters are then read by a nanoDotTM reader and the average reading of the two is calculated. The post-treatment QA involves the analysis of the DynaLog and DLog files. The DynaLog is a treatment log file that contains the planned and actual leaf positions at a given gantry angle. The DLog is a treatment log file that contains the planned segmented treatment table (STT) and the corresponding segment boundary samples, i.e., the actual delivered MU and gantry angle increment at each control point.
Journal Title IFMBE Proceedings
Volume: 39
Conference Dates: 2012 May 26-31
Conference Location: Beijing, China
ISBN: 1680-0737
Publisher: Springer  
Date Published: 2013-01-01
Start Page: 1872
End Page: 1875
Language: English
DOI: 10.1007/978-3-642-29305-4_493
PROVIDER: manual
Notes: ISBN: 978-3-642-29304-7
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MSK Authors
  1. Borys Mychalczak
    97 Mychalczak
  2. Boris A Mueller
    104 Mueller
  3. Ceferino Obcemea
    33 Obcemea
  4. Yulin Song
    116 Song
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