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

作者：Je Uikyu^*; Cho Hyosung; Lee Minsik; Oh Jieun; Park Yeonok; Hong Daeki; Park Cheulkyu; Cho Heemoon; Choi Sungil; Koo Yangseo

来源：Journal of the Korean Physical Society, 2014, 64(12): 1907-1911.

DOI：10.3938/jkps.64.1907

• Computed tomography
• Compressed-sensing
• Limited scan angle
• Low doses

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 (< 360A degrees) 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 200A degrees with a fixed angle step of 1.2A degrees 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.

• 出版日期2014-6