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Verification of Qfix Encompass™ couch modeling using the Acuros XB algorithm and HypeArc™ using a

Takumi Yamada1, Hisashi Nakano2, Satoshi Tanabe3

  • 1Section of Radiology, Department of Clinical Support, Niigata University Medical and Dental Hospital, Niigata, 951-8520, Japan.

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|July 16, 2023
PubMed
Summary

Accurate modeling of the Qfix Encompass™ immobilization system was achieved using specific Hounsfield unit (HU) values. This validated the AcurosXB (AXB) dose calculation algorithm, showing over 98% accuracy for stereotactic radiosurgery plans.

Keywords:
Acuros XBBrain metastasisCouch modelHyperArcSRS MapCHECKSingle-isocenter irradiation

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Treatment Planning

Background:

  • Accurate dose calculation is crucial for effective radiation therapy.
  • The Qfix Encompass™ immobilization system requires precise modeling for dose verification.
  • Stereotactic radiosurgery (SRS) demands high precision in dose delivery.

Purpose of the Study:

  • To model the Qfix Encompass™ immobilization system within a treatment planning system.
  • To verify the dose distribution calculated by the AcurosXB (AXB) dose calculation algorithm for SRS HyperArc™ plans.
  • To determine optimal Hounsfield Unit (HU) values for accurate Encompass™ modeling.

Main Methods:

  • Modeled the Qfix Encompass™ system using CT scans and a QA phantom.
  • Utilized the AcurosXB (AXB) dose calculation algorithm (ver. 15.5) with a 1.0 mm grid.
  • Verified dose distribution using SRS MapCHECK® (SRSMC) and gamma analysis in 12 patient plans.

Main Results:

  • The proposed Encompass™ modeling achieved a mean pass rate of >98% for both 6 MV and 6 MV FFF beams using the 1%/1 mm gamma criterion.
  • Optimized HU values were identified for Encompass™ and its base for different beam types (6 MV and 6 MV FFF).
  • The validated modeling demonstrated accurate dose distribution calculations.

Conclusions:

  • The developed Encompass™ modeling with specific HU values accurately represents the immobilization system.
  • The AcurosXB (AXB) algorithm, when used with this modeling, provides reliable dose calculations for HyperArc™ SRS plans.
  • This approach enhances the accuracy of radiotherapy treatment planning and dose verification.