Patent ID: 11386591

Abstract:
The present disclosure provides a reconstruction method for motion compensated high quality four-dimensional (4D)-Cone Beam Computed Tomography (CBCT) image based on bilateral filtering, including the following steps: step 1, building a motion compensated three-dimensional (3D)-CBCT reconstruction model based on a simultaneous algebraic reconstruction technique (SART) to reconstruct a high quality CBCT image of a reference phase (phase 0%); step 2, creating an iterative optimization procedure and estimating a 4D Deformable Vector Field (DVF) model between phase 0% and other 4D phase images, thereby obtaining an exact 4D-DVF inclusive of an inverse sliding motion on a surface of a locomotive organ; and step 3, successively deforming the high quality phase 0% image in accordance with an optimized 4D-DVF to obtain a sequence of final high quality 4D-CBCT images. This method permits exact reconstruction of high quality 4D-CBCT images without changing the hardware structure of an existing linear accelerator for conventional radiotherapy.