Cone-beam CT reconstruction with gravity-induced motion
| Autor: | Paul J. Keall, Michael Jackson, Soo-Min Heng, William Counter, Ilana Feain, Ricky O'Brien, Stéphanie Corde, Chun-Chien Shieh, Peter Bennett, Jeffrey Barber, Verity Ahern, Paul F. White, Jonathan R Sykes |
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| Rok vydání: | 2018 |
| Předmět: |
Computer science
Image quality Movement medicine.medical_treatment Motion (geometry) Image-guided radiotherapy Iterative reconstruction 029903 - Medical Physics [FoR] 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine motion management medicine Animals Radiology Nuclear Medicine and imaging Computer vision Lung Motion compensation Radiological and Ultrasound Technology business.industry Motion blur Cone-Beam Computed Tomography Radiation therapy 030220 oncology & carcinogenesis Rabbits Artificial intelligence Particle Accelerators business Rotation (mathematics) Algorithms Beam (structure) Gravitation |
| Zdroj: | Physics in Medicine & Biology. 63:205007 |
| ISSN: | 1361-6560 |
| Popis: | Fixed-gantry cone-beam computed tomography (CBCT), where the imaging hardware is fixed while the subject is continuously rotated 360° in the horizontal position, has implications for building compact and affordable fixed-gantry linear accelerators (linacs). Fixed-gantry imaging with a rotating subject presents a challenging image reconstruction problem where the gravity-induced motion is coupled to the subject's rotation angle. This study is the first to investigate the feasibility of fixed-gantry CBCT using imaging data of three live rabbits in an ethics-approved study. A novel data-driven motion correction method that combines partial-view reconstruction and motion compensation was developed to overcome this challenge. Fixed-gantry CBCT scans of three live rabbits were acquired on a standard radiotherapy system with the imaging beam fixed and the rabbits continuously rotated using an in-house programmable rotation cradle. The reconstructed images of the thoracic region were validated against conventional CBCT scans acquired at different cradle rotation angles. Results showed that gravity-induced motion caused severe motion blur in all of the cases if unaccounted for. The proposed motion correction method yielded clinically usable image quality with |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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