Abstract: A medical imaging-based system and method uses both kV and MV images captured during a treatment period for organ motion tracking. 3D geometric locations of internal features are computationally tracked as a function of time from internal features, such as natural biological features or implanted fiducials, which are computationally extracted from the captured kV and MV images. A partial information method allows 3D tracking to be maintained in the event that imaging information is temporarily not available.

Abstract: Real-time 3D tracking of anatomical positions during radiation therapy uses acquired image data from an MV treatment beam as it is rotated around the patient during arc radiotherapy treatment. The acquired image data and associated angular positions are computationally combined during the arc radiotherapy treatment to estimate in real time 3D positions of anatomical features of the patient, e.g., combining present image data and prior image data at earlier times. Supplementary image data from a kV imaging system may be acquired on an as-needed basis if MV position estimates indicate movement exceeding a predetermined threshold, and the supplementary kV image data combined with the acquired MV image data to improve an accuracy of the estimated 3D positions.

Abstract: A medical imaging-based system and method uses both kV and MV images captured during a treatment period for organ motion tracking. 3D geometric locations of internal features are computationally tracked as a function of time from internal features, such as natural biological features or implanted fiducials, which are computationally extracted from the captured kV and MV images. A partial information method allows 3D tracking to be maintained in the event that imaging information is temporarily not available.