@article{oai:kitami-it.repo.nii.ac.jp:00007537,
 author = {Dong, Jian and Hayakawa, Yoshihiko and Kannenberg, Sven and Kober, Comelia},
 issue = {2},
 journal = {Oral surgery, oral medicine, oral pathology, oral radiology},
 month = {Feb},
 note = {Objective: To reduce metal-induced streak artifact on oral and maxillofacial X-ray CT (computed tomography) images by developing the fast statistical image reconstruction system using iterative reconstruction algorithms.
Study design: Adjacent CT images often depict similar anatomical structures in thin slices. So firstly images were reconstructed using the same projection data of an artifact-free image. Secondly images were processed by the successive iterative restoration method where projection data was generated from reconstructed image in sequence. Besides the maximum likelihood-expectation maximization algorithm, the ordered subset-expectation maximization algorithm (OS-EM) was examined. Also small ROI setting and reverse processing were applied for improving performance.
Results: Both algorithms reduced artifacts instead of slightly decreasing gray levels. The OS-EM and small ROI reduced the processing duration without apparent detriments. Sequential and reverse processing didn’t show apparent effects.
Conclusions: Two alternatives in iterative reconstruction methods were effective for artifacts reduction. The OS-EM algorithm and small ROI setting improved the performance.},
 pages = {63--73},
 title = {Metal-induced streak artifact reduction using iterative reconstruction algorithms in X-ray CT image of the dento-alveolar region},
 volume = {115},
 year = {2013}
}