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Introducing SGRT for Clearance Mapping

SBRT, hypofractionation, and re-treatments are all driving the demand for non-coplanar planning. Traditionally, non-coplanar treatments are resource-intensive, requiring extra planning and machine time, both for dry runs and treatments. Additionally, some non-coplanar plans are not deliverable, which can lead to complicated re-planning and repeat quality assurance work, leading to delays in patient treatment and increased costs. 

This new solution from Vision RT is intended to make non-coplanar treatments fast, easy and safe. MapRT uses SGRT to deliver a “clearance map”, which planners use to check which beams are deliverable during plan creation. Unlike other clearance checkers, MapRT images the entire surface of the patient and accessories to detect collisions in the most frequent problem areas such as elbows. In addition, the clearance map checks safety for all couch and gantry angles, so planners have guidance to increase couch kicks and lengthen arcs – for better plans with confidence in delivery. 

MapRT, currently being evaluated in clinical settings, introduces Clearance Mapping to RT planning.

How MapRT works:

MapRT uses two lateral wide-field cameras in simulation to deliver a full 3D model of patients and accessories. This model is then used to calculate a clearance map for every couch (x-axis) and gantry (y-axis) angles. Plans can then be imported automatically to check beams, arcs, and the transition clearance.

MapRT can automatically receive and process DICOM RT plans from Eclipse®, Monaco®, Pinnacle®, and RayStation®.

“We see significant value in three areas: checking patient position at CT to ensure a robust setup and avoid unnecessary dose from scans in an unusable position; enhancing planning through increasing the range of beam options; improving the use of resources and the patient experience by avoiding dry runs and delays due to last minute replans.”

Helen Convery
Senior Dosimetrist (Development & Clinical Trials)

Improved assessment of deliverability¹

A five-center planning study recently showed improved assessment of deliverability using MapRT:

MapRT table

* Respondent comment on incorrect responses: the therapist will make small adjustments in the treatment room to make the gantry clear
** Respondent comment on incorrect responses: some fields were deliverable but considered too uncomfortable due to the machine’s proximity to patient’s face.

Non-coplanar treatment planning using clearance mapping has shown the potential to enhance outcomes, as shown in this planning study of head and neck retreatments:

Calculated Outcome Probabilities

“4Pi plans may allow dose escalation with significant and consistent improvements in critical organ sparing, tumor control, and coverage.” ²

Would you like to find out more about MapRT?

At Vision RT, we pride ourselves on our responsiveness and customer service.

Whether you’re looking for a quote, a demo (virtual or in-person) or just more information, please get in touch about MapRT or any of our other suite of products: 

MapRT is not currently for sale in the USA. 

1. Surface-guided clearance mapping: see more, do more and achieve more. SGRT Community USA 2022.

2. Rwigema JC, Nguyen D, Heron DE, Chen AM, Lee P, Wang PC, Vargo JA, Low DA, Huq MS, Tenn S, Steinberg ML, Kupelian P, Sheng K. 4π noncoplanar stereotactic body radiation therapy for head-and-neck cancer: potential to improve tumor control and late toxicity. Int J Radiat Oncol Biol Phys. 2015 Feb 1;91(2):401-9. doi: 10.1016/j.ijrobp.2014.09.043. Epub 2014 Dec 5. PMID: 25482301.

0008-0031 – MapRT press release  Issue1