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Updated: Jan 15, 2026

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RapidArc dynamic versus RapidArc: A multi anatomical-site dosimetric evaluation.

Aram Rostami1, Carole Naim1, Renilmon Pottanplackal Sukumaran1

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|January 14, 2026
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Summary

RapidArc Dynamic (RAD) improves organ-at-risk sparing and dose conformity over conventional RapidArc (RA) without affecting target coverage. This advanced VMAT technique shows promise for complex cancer treatments.

Keywords:
RapidArcRapidArc dynamicvolumetric modulated arc therapy

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Cancer Treatment Technology

Background:

  • Conventional RapidArc (RA) VMAT delivery faces challenges in optimal organ-at-risk (OAR) sparing for complex cancer cases.
  • RapidArc Dynamic (RAD) is a next-generation VMAT technique featuring dynamic collimator rotation, static fields, and an advanced optimizer for enhanced dose modulation.

Purpose of the Study:

  • To compare the dosimetric outcomes, specifically OAR sparing and target coverage, between conventional RA and RAD across diverse anatomical sites.
  • To evaluate the potential of RAD to overcome limitations of RA in complex treatment scenarios.

Main Methods:

  • Retrospective analysis of 40 cancer patients (breast, lung SBRT, prostate, head and neck), with each case replanned using both RA and RAD.
  • Dosimetric evaluation using dose-volume histograms (DVH) and statistical comparison of target coverage and OAR sparing parameters.

Main Results:

  • RAD demonstrated equivalent target coverage compared to RA across all studied anatomical sites.
  • Significant improvements in OAR sparing were observed with RAD, including reduced doses to the heart, lungs, rectum, bladder, spinal cord, parotids, and cochleae.
  • RAD also showed improved dose conformity in lung SBRT cases.

Conclusions:

  • RapidArc Dynamic (RAD) provides superior OAR sparing and enhanced dose conformity compared to conventional RapidArc (RA), while maintaining target coverage.
  • The findings support the clinical adoption of RAD, especially for anatomically complex treatments requiring high precision.
  • Further prospective research is recommended to validate the long-term clinical benefits of RAD.