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4D VMAT planning and verification technique for dynamic tracking using a direct aperture deformation (DAD) method.

Yongqian Zhang1, Yong Yang2, Weihua Fu1

  • 1Department of Radiation Oncology, University of Pittsburgh Cancer Institute, Pittsburgh, PA, 15232, USA.

Journal of Applied Clinical Medical Physics
|March 17, 2017
PubMed
Summary

A new four-dimensional volumetric modulated arc therapy (4D VMAT) technique using direct aperture deformation (DAD) effectively manages moving targets in lung cancer radiotherapy. This method ensures comparable plan quality and delivery efficiency to traditional 3D VMAT, improving treatment accuracy.

Keywords:
4D VMATIMRT verificationdirect aperture deformation (DAD)stereotactic ablative body radiotherapy (SABR)

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiotherapy Planning

Background:

  • Moving targets in radiotherapy pose challenges for accurate dose delivery due to intra-fraction motion.
  • Volumetric Modulated Arc Therapy (VMAT) is a modern radiotherapy technique, but adapting it for moving targets requires advanced planning.
  • Four-dimensional (4D) imaging captures respiratory motion, but integrating this data into VMAT planning remains complex.

Purpose of the Study:

  • To develop and assess a novel 4D VMAT planning technique for moving targets utilizing a direct aperture deformation (DAD) method.
  • To evaluate the clinical feasibility and dosimetric performance of the proposed 4D VMAT DAD technique compared to conventional 3D VMAT.
  • To verify the accuracy of the 4D VMAT DAD technique through phantom and patient-specific measurements.

Main Methods:

  • A 3D VMAT plan was created on a reference phase of 4D CT data.
  • Control points (beam angle, MLC apertures, weights) were assigned to respiratory phases using temporal information.
  • A DAD algorithm deformed beam apertures to compensate for tumor motion and shape changes across respiratory phases.

Main Results:

  • Phantom studies demonstrated that 4D VMAT with DAD achieved dosimetric results comparable to ideal 3D VMAT.
  • Dosimetric analysis showed invariant planning target volume (PTV) coverage and minimal changes in lung dosimetry for both phantom and patient cases.
  • Verification measurements using a moving phantom and patient plans yielded high gamma index pass rates (e.g., 95.2% for 4D VMAT patient plans with 3%/3 mm criteria).

Conclusions:

  • The developed 4D VMAT planning technique using DAD is feasible for clinical implementation, effectively accounting for intra-fraction organ motion and shape variations.
  • This technique shows significant potential for delivering high-quality radiotherapy plans with improved efficiency for moving targets.
  • The DAD method offers a robust approach to enhance the accuracy and effectiveness of VMAT for challenging mobile tumors.