Methods and systems to determine respiratory phase and motion state during guided radiation therapy
US10806947B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 2016 |
| Grant date | Oct 20, 2020 |
| Priority date | — |
| Expiry date | Nov 18, 2037 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2005/1063
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Methods and systems using magnetic resonance and ultrasound for tracking anatomical targets for radiation therapy guidance are provided. One system includes a patient transport configured to move a patient between and into a magnetic resonance (MR) system and a radiation therapy (RT) system. An ultrasound transducer is also provided that is hands-free and electronically steerable, securely attached to the patient, such that the ultrasound transducer is configured to acquire four-dimensional (4D) ultrasound images concurrently with one of an MR acquisition or an RT radiation therapy session. The system also includes a controller having a processor configured to use the 4D ultrasound images and MR images from the MR system to control at least one of a photon beam spatial distribution or intensity modulation generated by the RT system. The system determines the previously-acquired correct MR images that represent a specific motion state at some time, t, by a plurality of transformations that allow the representation of the position of fiducial markers in the corresponding ultrasound images to match that of a prior ultrasound acquisition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.