SGRT for Halcyon® and Ethos™ linear accelerators

AlignRT InBore combines the benefits of ceiling-mounted AlignRT cameras for patient setup, with an innovative, miniaturized SGRT ring camera system mounted within the bore, to eliminate shadowing during treatment.

This novel approach provides a comprehensive end-to-end SGRT solution for patients undergoing treatment on bore-based treatment platforms, without the physical design of the bore-based system compromising the SGRT benefits.

Published clinical data shows:

  • Faster total treatment time¹
  • Accurate and reproducible DIBH²
  • High detection accuracy for setup and monitoring³
Halcyon & Ethos Connectivity


In accordance with Varian’s Verification and Validation Process, AlignRT InBore is compatible with Halcyon and Ethos Radiotherapy System versions 2.0, 3.0, 3.1, 4.0.

Varian is currently developing an interface to connect motion management technology with Halcyon and Ethos Radiotherapy Systems. The release of the architecture, which will be similar to MMI on TrueBeam, is expected in the near future. When an interface specification becomes available, Vision RT will have access to this interface through Varian’s Interoperability program.

Published data from UCSD demonstrates that using AlignRT for setup can reduce treatment times, reduce repeat imaging and improve patient position accuracy by reducing residual rotational errors.¹

Mean total treatment time reduced by 5% after AlignRT implementation¹
Up to 50% reduction in the number of fractions requiring setup correction and additional imaging fields¹

What our customers say

Halcyon® & Ethos™ are registered trademarks of Varian Medical Systems. The use of Halcyon® & Ethos™ herein is for identification purposes only. Use of these marks does not indicate sponsorship, affiliation, endorsement, or approval by Varian

  1. Flores-Martinez, E., Cerviño, L.I., Pawlicki, T. and Kim, G.-Y. (2020). Assessment of the use of different imaging and delivery techniques for cranial treatments on the Halcyon linac. Journal of Applied Clinical Medical Physics, [online] 21(1), pp.53–61. doi:
  2. Lorchel, F., Nguyen, D., et al.(2022). Reproducibility of Deep-Inspiration Breath Hold treatments on HalcyonTMperformed using the first clinical version of AlignRT InBoreTM: Results of CYBORE study. Clinical and Translational Radiation Oncology, 35, pp.90–96. doi:
  3. Oku, Y., Toyota, M. and Yasumasa Saigo (2023). Characteristics of detection accuracy of the patient setup using InBore optical patient positioning system. Radiological Physics and Technology. doi:

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Vision RT’s family of SGRT solutions guide radiation therapy for better patient care at every step: Sim, Planning, Treatment and Dose. Whether you’re looking for a quote, a product demo (virtual or in-person) or just more information, please get in touch.