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금속 음영이 포함된 CBCT 영상에서 딥러닝을 이용한 해부학적 구조물의 다중 클래스 분할 방법
양수(Su Yang),천소영(Soyoung Chun),김다엘(Dael Kim),전보성(Bo Soung Jeoun),유지용(Jiyong Yoo),강세룡(Se-Ryong Kang),최민혁(Min-Hyuk Choi),김조은(Jo-Eun Kim),허경회(Kyung-Hoe Huh),이삼선(Sam-Sun Lee),허민석(Min-Suk Heo),이원진(Won-Jin Y 대한전기학회 2022 전기학회논문지 Vol.71 No.1
In order to perform preoperative surgical planning, accurate segmentation of anatomical structures in cone-beam computed tomography (CBCT) images is required. However, this image segmentation is often impeded by metal artifacts, and it takes a lot of time due to morphological variability in patients. In this paper, we proposed a deep learning based automatic multi-class segmentation method for anatomical structures in CBCT images containing metal artifacts. Four U-Net based deep learning models were used for anatomical structure segmentation. Each deep learning model was constructed by changing the encoder of U-Net architecture to the backbones (DenseNet121, VGGNet16, ResNet101, and EfficienNetB4). For training and testing our method, we used 20744 CBCT images containing metal artifacts from 30 patient datasets. Experimental results show that the segmentation performances of the mandible, midfacial bone, mandibular canal, and maxillary sinus were achieved F1 scores of 0.912±0.070, 0.880±0.080, 0.687±0.265, and 0.954±0.063 using DenseNet121 with Tversky loss, respectively. Furthermore, our method was able to perform robust and accurate segmentation of anatomical structures in CBCT images containing metal artifacts.
적대적 신경망 기반 치과용 파노라마 영상의 방사선 선량 감소 방법
최민혁(MinHyuk Choi),강세룡(SaRyong Kang),유지용(Jiyong Yoo),최시은(Sieun Choi),전보성(Bosoung Jeoun),양수(Su Yang),천소영(Soyoung Chun),김진(Jin Kim),김다엘(DaEl Kim),이원진(Wonjin Yi) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
Dental panoramic radiography was widely used to screen the patient. Although the dose of panoramic radiography was lower than that of CT, it was higher than other medical imaging modality, such as intraoral x-ray and cephalometry. In this paper, we reconstructed the panoramic radiography from sparse view image using GAN for lower dose. Total 473 panoramic images were used to train the GAN model and test it. GAN could be reproduce the anatomy of teeth with 0.69±0.03 of structural similarity index.