2024-03-28T18:37:28Z
https://kitami-it.repo.nii.ac.jp/oai
oai:kitami-it.repo.nii.ac.jp:00007525
2022-12-13T02:20:07Z
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Successive iterative restoration applied to streak artifact reduction in X-ray CT image of dento-alveolar region
Dong, Jian
Kondo, Atsushi
Abe, Kosuke
Hayakawa, Yoshihiko
open access
X-ray CT image
Iterative restoration
Streak artifact reduction
Dento-alveolar imaging
Maxillofacial imaging
Purpose: X-ray computed tomography (CT) images in the
dento-alveolar region are sometimes rendered unusable for
diagnostic purposes due to the appearance of streak artifacts.
The purpose of the study is to reduce streak artifacts
appeared on dental and maxillofacial X-rayCT images by the
application of modified iterative restoration method.
Methods: We took advantage of the aspect that adjacent CT
images often depict very similar anatomical structures within
the resulting collection of thin-slice images. CT images
having streak artifacts were processed using the projection
data of adjacent CT images. A modified iterative correction,
the maximum likelihood-expectation maximization
(ML-EM) reconstruction algorithm, was employed to reduce
the streak artifact caused by metallic materials in the oral
cavity. It approximates between the processed image and the
original projection data. First, the projection data of an intact
image were obtained, and then, the next image that had streak
artifacts was processed. The projection data of the processed
image were obtained, and the ML-EM method was applied
to the next image again. Then, the successive iterative restoration
was carried out.
Results: Twelve adjacent images were processed. Each
iterative restoration was carried out fifty times. Streak artifacts
were observed on processed images at the initial stage,
but some of them either suppressed or disappeared as the
iteration progressed.
Conclusions: The modified ML-EM method was effective to
reduce streak artifacts in X-ray CT images in dento-alveolar
region.
Springer
2011
eng
journal article
AM
https://kitami-it.repo.nii.ac.jp/records/7525
http://doi.org/10.1007/s11548-010-0544-2
International Journal of Computer Assisted Radiology and Surgery
6
5
635
640
https://kitami-it.repo.nii.ac.jp/record/7525/files/Dong etal_JCARSVol6No5 (2011)635-640.pdf
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