Open AccessAddendum to brachytherapy dose‐volume histogram commissioning with multiple planning systems
Author(s) -
Gossman Michael S.
Publication year - 2016
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1120/jacmp.v17i3.6105
Subject(s) - addendum , brachytherapy , radiation treatment planning , dose volume histogram , medical physics , volume (thermodynamics) , computer science , nuclear medicine , histogram , dosimetry , medicine , radiation therapy , radiology , artificial intelligence , physics , image (mathematics) , quantum mechanics , political science , law
The process for validating dose‐volume histogram data in brachytherapy software is presented as a supplement to a previously published article. Included is the DVH accuracy evaluation of the Best NOMOS treatment planning system called “Best TPS VohvmePlan” As done previously in other software, a rectangular cuboid was contoured in the treatment planning system. A single radioactive 125 I source was positioned coplanar and concentric with one end. Calculations were performed to estimate dose deposition in partial volumes of the cuboid structure, using the brachytherapy dosimetry formalism defined in AAPM Task Group 43. Hand‐calculated, dose‐volume results were compared to TPS‐generated, point‐source‐approximated dose‐volume histogram data to establish acceptance. The required QA for commissioning was satisfied for the DVH as conducted previously for other software, using the criterion that the DVH % Vol TPS“actual variance” calculations should differ by no more than 5% at any specific radial distance with respect to % Vol TG ‐ 43 , and the “average variance” DVH % Vol TPScalculations should differ by no more than 2% over all radial distances with respect to % Vol TG ‐ 43 . The average disagreement observed between hand calculations and treatment planning system DVH was less than 0.5% on average for this treatment planning system and less than 1.1% maximally for 1 ≤ r ≤ 5 cm . PACS number(s): 87.10.+e, 87.55.‐x, 87.53.Jw, 07.05.Tp