Dental cone-beam CT reconstruction from limited-angle view data based on compressed-sensing (CS) theory for fast, low-dose X-ray imaging

• Published in: Journal of the Korean Physical Society Vol. 64; no. 12; pp. 1907 - 1911
• Main Authors: Je, Uikyu, Cho, Hyosung, Lee, Minsik, Oh, Jieun, Park, Yeonok, Hong, Daeki, Park, Cheulkyu, Cho, Heemoon, Choi, Sungil, Koo, Yangseo
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.06.2014; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; Low doses; Computed tomography; Limited scan angle; Compressed-sensing
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.64.1907

Recently, reducing radiation doses has become an issue of critical importance in the broader radiological community. As a possible technical approach, especially, in dental cone-beam computed tomography (CBCT), reconstruction from limited-angle view data (< 360°) would enable fast scanning with reduced doses to the patient. In this study, we investigated and implemented an efficient reconstruction algorithm based on compressed-sensing (CS) theory for the scan geometry and performed systematic simulation works to investigate the image characteristics. We also performed experimental works by applying the algorithm to a commercially-available dental CBCT system to demonstrate its effectiveness for image reconstruction in incomplete data problems. We successfully reconstructed CBCT images with incomplete projections acquired at selected scan angles of 120, 150, 180, and 200° with a fixed angle step of 1.2° and evaluated the reconstruction quality quantitatively. Both simulation and experimental demonstrations of the CS-based reconstruction from limited-angle view data show that the algorithm can be applied directly to current dental CBCT systems for reducing the imaging doses and further improving the image quality.