First Radixact™ System Research Results Presented at the American Association of Physicists in Medicine Annual Meeting
Research highlights include:
Faster planning and reduced treatment time
- A study evaluated the performance of the Radixact System based on a comparison of treatment plans developed for this system and the TomoHDA™ System. Treatment plans were created using the VoLO™ Planning Solution for the TomoHDA technology, then recreated using the Accuray Precision™ Treatment Planning System (TPS) for the Radixact System. Developing optimal plans using the Accuray Precision TPS was much faster, and the treatment beam-on time was reduced by up to 50% while maintaining the excellent plan quality. Researchers at the
Miami Cancer Institutein Miami, Floridaand Accuray Incorporatedconducted the research.
Proven image quality and stability
- The first clinical assessment of Radixact low-dose fan beam MVCT image guidance found there was no statistically significant difference in the noise, uniformity, and Hounsfield units (HU) stability over the three-month evaluation period, demonstrating the strength of the System's MVCT image quality and its potential value for dose calculation. Clinicians at the
Miami Cancer Instituteteam conducted the research.
- Radixact and TomoTherapy System dosimetric beam characteristics were compared over a six-month period. Radixact data were within the specifications established for the TomoTherapy System and showed a good agreement with the beam model. These results indicate that the beam commissioning process will be straightforward for the Radixact System. Researchers at
Miami Cancer Instituteand Accurayconducted the study.
The future of radiation therapy
- Two studies demonstrated the feasibility of real-time motion management leveraging the TomoTherapy System's one-of-a-kind helical delivery capabilities.
Accurayresearchers investigated the potential for adapting the CyberKnife® System's unique Synchrony® Respiratory Tracking System to an experimental TomoTherapy System. The study showed Synchrony-like real-time respiratory motion management is technically feasible using TomoTherapy technology, enabling a high level of accuracy when delivering dose to tumors that move with respiration.
- The dosimetric impact of using real-time primary jaw/multileaf collimator (MLC) compensation approaches to mitigate motion during TomoHelical™ delivery was analyzed by a team of researchers from the
University of Wisconsin, Madisonand Accuray. Dose was calculated for treatment plans assuming 1) no motion, 2) respiratory motion, and 3) respiratory motion compensated by adjusting the jaw and MLC position during delivery. The team found that a jaw and MLC compensation approach mitigated the large difference between planned and delivered dose caused by motion, thus enabling reductions in margin.
"The data presented at this year's AAPM speak to the precision, accuracy and effectiveness of
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