Stereotactic Body Radiation Therapy (SBRT)

Stereotactic Body Radiation Therapy (SBRT, also known as SABR) requires high positional accuracy. AlignRT® can track motion with better than 1mm accuracy, and as a result, is used for both standard and breath-hold SBRT. AlignRT has been shown to help treat SBRT patients with relatively little immobilization, which leads to enhanced comfort. In addition, patients may be treated without fiducial placement, while potentially avoiding repeat imaging during the procedure.

AlignRT can reduce the complexity of treatment setups. including shifts after X-ray imaging, and allows users to set independent thresholds for breathing patterns.  Tumor motion can result in avoidable large target volumes and unacceptable irradiation of normal tissue volume, AlignRT can help mitigate these risks with real-time patient tracking and automatic radiation pause.  If the patient moves out of position.  Breath-hold techniques can help stabilize tumor movement, and planned treatment volume may be minimized and 4D planning eliminated.

Horizon right

The benefits of SBRT with AlignRT

The implementation of a SBRT program involves delivering higher doses over fewer fractions with reduced clinical margins. This can raise key concerns around safety and accuracy. Implementing SBRT with AlignRT®, the Surface Guided Radiation Therapy (SGRT) solution from Vision RT, can help you ensure these additional demands are met and you can be confident treatment is delivered exactly as planned.


AlignRT tracks patients in real-time during the entire treatment delivery procedure with sub-mm and sub-degree accuracy¹,²,³.
It is the ideal choice for both breath-hold and free-breathing SBRT treatment delivery.


Compared to traditional methods, AlignRT provides more setup accuracy⁵,⁶,⁷ and automatically and instantly* pauses the beam if clinically significant movement is detected, or if a patient isn’t at the right breath-hold level ⁴,⁵,⁶,⁷.


AlignRT is completely non-contact and non-ionizing; there is no need to immobilize patients or use external or internal markers. AlignRT is clinically proven to be as accurate as solutions relying on additional internal imaging ⁸,⁹.


AlignRT provides a consistent and efficient workflow for SBRT delivery and no extra equipment is required. Treatments can be completed in the same amount of time, with minimal impact on capacity and throughput ¹⁰, ¹¹ .

Hear from the users

“At Beacon Hospital, AlignRT is central to the safe and accurate delivery of SBRT for multiple treatment sites. AlignRT offers several benefits for SBRT treatment delivery at our facility including real-time monitoring of the patient, management of respiratory motion and continuous and high precision monitoring of patient movement during cone-beam CT image matching. The use of AlignRT for SBRT has increased our confidence in providing an accurate treatment delivery”

Luke Rock MSc, DABR, Chief Medical Physicist
Department of Radiotherapy, Beacon Hospital, Ireland

“Traditionally SBRT technologies have offered gains in accuracy but often at the cost of things like efficiency, customization, and comfort for the patient; current evidence seems to suggest that SGRT has overcome this trade-off challenge.”

Mike Tallhamer,
Chief of Radiation Physics, Centura Health

Mike Tallhamer

Get in touch

Vision RT’s family of SGRT solutions guide radiation therapy for better patient care at every step: sim, planning and treatment.

Whether you’re looking for a quote, a product demo (virtual or in-person) or just more information, please get in touch:

10 reasons why SBRT with AlignRT® is the best choice


  1. Wen et at. Technical Note: Evaluation of the systematic accuracy of a frameless, multiple image modality guided, linear accelerator based stereotactic radiosurgery system. Med Phys. 2016 May;43(5):2527
  2. Covington E, et al. Submillimeter monitoring of intrafraction patient movement with optical surface imaging. AAPM Annual Meeting 2018.
  3. Vision RT. Advanced Camera Optimization [White paper] 2018
  4. Heinzerling JH, et al. Use of 3D optical surface mapping for quantification of interfraction set up error and intrafraction motion during stereotactic body radiation therapy treatments of the lung and abdomen. IJROBP 2017;99 (2):E670
  5. Leong B et al. Impact of Use of Optical Surface Imaging on Initial Patient Setup for Stereotactic Body Radiotherapy Treatments. Journal of Applied Clinical Medical Physics 2019; 20 (12):149-158
  6. Herron E, et al. Surface guided radiation therapy as a replacement for patient marks in treatment of breast cancer. International Journal of Radiation Oncology • Biology • Physics 2018;102 (3):e492-e493
  7. Allen and Ramtohul. Markerless Radiotherapy at the Queen Elizabeth Hospital Birmingham. Radiography. 2020; 26(1):S8-9
  8. Sarkar V, et al. An evaluation of the consistency of shifts reported by three different systems for non-coplanar treatments. Journal of radiosurgery and SBRT 2018;5 (4):323-330.
  9. Wiant D, et al. Direct comparison between surface imaging and orthogonal radiographic imaging for SRS localization in phantom. Journal of Applied Clinical Medical Physics; 2019; 20 (1): 137-144
  1. Menyhart G. SGRT for Breath Hold SBRT: A Measured Response. SGRT Annual Meeting, Atlanta 2016
  2. Lawson J. Surface Guided Radiation Therapy (SGRT) in SRS and SBRT. Advances in Accuracy and Elevating Patient Experience, Sydney 2019