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Dosimetric study of the AAA algorithm for the VMAT technique using an anthropomorphic phantom in the pelvic region

Published online by Cambridge University Press:  12 January 2015

Vicente Puchades ,
Alfredo Serna ,
Fernando Mata-Colodro ,
Davis Ramos-Amores ,
Emilio Casal  and
Miguel Alcaraz
Vicente Puchades*
Affiliation:
Department of Medical Physics, Hospital Universitario Santa Lucia, Cartagena, España
Alfredo Serna
Affiliation:
Department of Medical Physics, Hospital Universitario Santa Lucia, Cartagena, España
Fernando Mata-Colodro
Affiliation:
Department of Medical Physics, Hospital Universitario Santa Lucia, Cartagena, España
Davis Ramos-Amores
Affiliation:
Department of Medical Physics, Hospital Universitario Santa Lucia, Cartagena, España
Emilio Casal
Affiliation:
Centro Nacional de Dosimetría (CND), Valencia, España
Miguel Alcaraz
Affiliation:
Departamento de Radiología y Medicina Física, Facultad de Medicina, Universidad de Murcia, Murcia, España
*
Correspondence to: Vicente Puchades Puchades, Mezquita s/n, 30202 Cartagena, Spain. Tel: +34 968 12 86 00; E-mail: [email protected]
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Abstract

Purpose

The objective of this work was to investigate the accuracy of AAA dose calculation algorithm for RapidArc volumetric modulated technique (VMAT) in the presence of anatomical heterogeneities in the pelvic region.

Material and methods

An anthropomorphic phantom was used to simulate a prostate case, delineating planning target volumes (PTVs) and organs at risk. VMAT plans were optimised in eclipse (v10·0) treatment planning system (TPS). The dose distributions were calculated by the AAA dose calculation algorithm. A total of 49 thermoluminiscent dosimeters were inserted into the anthropomorphic phantom and dose measurements were compared with the predicted TPS doses.

Results

The average dose variation was −1·5% for planning target volume corresponding to the prostate and −0·3% for planning target volume corresponding to the pelvic nodes, −0·2% for the rectum, +2·4% for the bladder, −2·0% for the femoral heads and +1·0% for the intestinal package.

Conclusion

AAA is a reliable dose calculation for the treatment with VMAT in the anatomy of the pelvis.

Keywords

AAA algorithmanthropomorphic phantomheterogeneities calculationvolumetric arc therapy (VMAT)
Type
Original Articles
Information
Journal of Radiotherapy in Practice , Volume 14 , Issue 2 , June 2015 , pp. 162 - 170
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Copyright
© Cambridge University Press 2015 

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