• The Korean Journal of Nuclear Medicine Technology
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• v.15 no.2
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• pp.3-12
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• 2011

Purpose: With increasing medical use of radiation and radioactive isotopes, there is a need to better manage the risk of radiation exposure. This study aims to grasp and analyze the individual radiation exposure situations of radiation-related workers in a medical facility by specific job, in order to instill awareness of radiation danger and to assist in safety and radiation exposure management for such workers. Materials and Methods: From January 1, 2010 December 31, 2010, medical practitioners working in the radiation is classified as a regular personal radiation dosimetry, and subsequently one year 540 people managed investigation department to target workers, dose sectional area, working period, identify the job function-related tasks for a deep dose, respectively, the annual average radiation dose were analyzed. Frequency analysis methods include ANOVA was performed. Results: Medical radiation workers in the department an annual radiation dose of Nuclear and 4.57 mSv a was highest, dose zone-specific distribution of nuclear medicine and in the 5.01~19.05 mSv in the high dose area distribution showed departmental radiation four of the annual radiation dose of Nuclear and 7.14 mSv showed the highest radiation dose. More work an average annual radiation dose according to the job function related to the synthesis of Cyclotron to 17.47 mSv work showed the highest radiation dose, Gamma camera Cinema Room 7.24 mSv, PET/CT Cinema Room service is 7.60 mSv, 2.04 mSv in order of intervention high, were analyzed. Working period, according to domain-specific average annual dose of radiation dose from 10 to 14 in oral and maxillofacial radiology practitioners as high as 1.01~3.00 mSv average dose showed the Department of Radiology, 1-4 years, 5-9 years, respectively, 1.01 workers~8.00 mSv in the range of the most high-dose region showed the distribution, nuclear medicine, and the 1-4 years, 5-9 years 3.01~19.05 mSv, respectively, workers of the highest dose showed the distribution of the area in the range of 10 to 14 years, Workers at 15-19 3.01~15.00 mSv, respectively in the range of the high-dose region were distributed. Conclusion: These results suggest that medical radiation workers working in Nuclear Medicine radiation safety management of the majority of the current were carried out in the effectiveness, depending on job characteristics has been found that many differences. However, this requires efforts to minimize radiation exposure, and systematic training for them and for reasonable radiation exposure management system is needed.

• The Journal of the Korean dental association
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• v.47 no.10
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• pp.647-655
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• 2009

지면의 한계 상 다양한 악성종양을 모두 다룰 수가 없어, 주로 상악에 발생하여 골 파괴를 야기하고 있는 증례들의 영상 소견을 소개하고자 한다. 악성종양의 진단 과정에는 보통 CT, MRI, PET/CT 등의 특수 장치들이 필요하지만, 개원의들이 일반 환자들의 진단과 치료 과정에서 흔히 접하게 되는 파노라마 방사선사진을 중심으로 하여, 악성종양들의 병인이나 기본적인 악성종양에 대한 설명 보다는 실제 임상 증례들을 통해 악성종양의 공통된 영상 소견 특징을 찾아보고자 한다.

• The Journal of the Korean dental association
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• v.30 no.12 s.283
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• pp.876-878
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• 1992

사회가 복잡다단 하여짐에 따라 스트레스의 증가는 각종 정신신체질환의 발현빈도를 증가시켜 악구강 영역에서도 악관절 동통을 포함한 광범위한 악안면 동통을 유발하고 있다. 악안면 동통 환자의 치료시에는 수술과 같은 비가역적(관혈적) 치료방법을 선택하기에 앞서 환자에 손상이 적고 경제적 부담도 적은 가역적(보존적)치료 방법을 우선 선택하여야겠다. 이에 본 악안면 동통 진료실에 방법 및 그 증례에 대해 소개하고자 한다.

• The Journal of the Korean dental association
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• v.30 no.9 s.280
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• pp.636-637
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• 1992

사회가 복잡다단 하여짐에 따라 스트레스의 증가는 각종 정신신체질환의 발현빈도를 증가시켜 악구강 영역에서도 악관절 동통을 포함한 광범위한 악안면 동통을 유발하고 있다. 악안면 동통 환자의 치료시에는 수술과 같은 비가역적(관혈적) 치료방법을 선택하기에 앞서 환자에 손상이 적고 경제적 부담도 적은 가역적(보존적)치료 방법을 우선 선택하여야겠다. 이에 본 악안면 동통 진료실에 방법 및 그 증례에 대해 소개하고자 한다.

• The Journal of the Korean dental association
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• v.30 no.10 s.281
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• pp.712-713
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• 1992

사회가 복잡다단 하여짐에 따라 스트레스의 증가는 각종 정신신체질환의 발현빈도를 증가시켜 악구강 영역에서도 악관절 동통을 포함한 광범위한 악안면 동통을 유발하고 있다. 악안면 동통 환자의 치료시에는 수술과 같은 비가역적(관혈적) 치료방법을 선택하기에 앞서 환자에 손상이 적고 경제적 부담도 적은 가역적(보존적)치료 방법을 우선 선택하여야겠다. 이에 본 악안면 동통 진료실에 방법 및 그 증례에 대해 소개하고자 한다.

• The Journal of the Korean dental association
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• v.24 no.4 s.203
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• pp.345-357
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• 1986

Computerized tomography has become more widely available in numerous centers throughout the world and is now recognized in many specialities as an important diagnostic procedure. The use of computerized tomography in oral and maxillofacial surgery is discussed. It has been found to be of special value in the diagnosis and assesment of expanding and infiltrating lesions of the jaws, fracture and infections, especially in the midface, in both adults and children.

• The Journal of the Korean dental association
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• v.30 no.11 s.282
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• pp.788-789
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• 1992

사회가 복잡다단 하여짐에 따라 스트레스의 증가는 각종 정신신체질환의 발현빈도를 증가시켜 악구강 영역에서도 악관절 동통을 포함한 광범위한 악안면 동통을 유발하고 있다. 악안면 동통 환자의 치료시에는 수술과 같은 비가역적(관혈적) 치료방법을 선택하기에 앞서 환자에 손상이 적고 경제적 부담도 적은 가역적(보존적)치료 방법을 우선 선택하여야겠다. 이에 본 악안면 동통 진료실에 방법 및 그 증례에 대해 소개하고자 한다.

• Proceedings of the KSMRM Conference
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• 2003.10a
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• pp.26-26
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• 2003

목적： 본 연구의 목적은 미각자극에 대한 인간 뇌의 활성화 영역을 측정하고 가시화하여 미각의 뇌 활성화 부위에 대한 기초자료를 마련하는데 있다. 대상 및 방법： 5명의 남자 대학생 (평균 24.8세)을 뇌기능 연구의 실험 대상자로 선정하였고, 대상자들은 미각에 이상이 없고 구강수술 경험이 없는 오른손잡이를 대상으로 3번에 걸쳐 EPI 혈액산 소농도의존(blood oxygen level dependent)법을 이용하여 미각자극에 의한 기능적 자기공명영상 실험을 수행하였다. 미각 자극을 위하여 5％의 saline을 사용하였으며 자체적으로 제작한 Stimulator를 사용하여 자극하였다. 자극은 3회의 휴식기간과 2회의 자극기간에 걸쳐 시행하였으며, 각 자극기간은 30초씩 5초 간격으로 이스 당 42개의 영상을 획득했다. Post-processing은 SPM99 (Statistical Parametric Mapping 99, The Wellcome Department of Cognitive Neurology, Oxford 1999)의 correlation법을 사용하여 threshold 0.4∼0.7의 범위에서 통계처리 하였으며, 활성화 영상은 EPI영상과 같은 부위의 T1 강조영상에 overlapping시켰다. 이렇게 얻어진 fMRI 영상으로 활성 영역의 위치를 분석하였다.

• The Journal of Korean Academy of Prosthodontics
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• v.55 no.2
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• pp.135-143
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• 2017

Purpose: This research was conducted to compare the marginal and internal fit of zirconia prostheses fabricated with the model scan method and the intraoral scan method. Materials and methods: In this study, 20 extracted human mandibular first molar was used in the preparation of abutment tooth for the fabrication of zirconia prostheses. In the first group, the model scan method was applied on 10 prepared teeth. In the other group, the intraoral scan method was used on other 10 prepared teeth. Datum of both groups were transmitted to the software system. Afterwards, 20 zirconia prostheses were fabricated using the Ceramill system. Weight technique was used to evaluate the internal gap of the zirconia prostheses. In the Replica technique, marginal gap of the zirconia prostheses were analyzed by optical microscopy. Statistical analysis was based on one-way ANOVA. Results: Model scan group showed lower average weight than intraoral scan group when weight technique was applied, which has significance (P < .05). Also, model scan group showed significantly lower figures in all 5 measurements of replica technique than intraoral scan group (P < .05). Conclusion: Zirconia prostheses of both groups demonstrated clinically acceptable margin and internal fit. However, model scanned zirconia prostheses showed higher marginal and internal fit than intraoral scanned crowns.

• The Transactions of the Korea Information Processing Society
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• v.13 no.7
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• pp.326-334
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• 2024

Extra-oral imaging techniques such as Panoramic X-rays (PXs) and Cone Beam Computed Tomography (CBCT) are the most preferred imaging modalities in dental clinics owing to its patient convenience during imaging as well as their ability to visualize entire teeth information. PXs are preferred for routine clinical treatments and CBCTs for complex surgeries and implant treatments. However, PXs are limited by the lack of third dimensional spatial information whereas CBCTs inflict high radiation exposure to patient. When a PX is already available, it is beneficial to reconstruct the 3D oral structure from the PX to avoid further expenses and radiation dose. In this paper, we propose 3DentAI - an U-Net based deep learning framework for 3D reconstruction of oral structure from a PX image. Our framework consists of three module - a reconstruction module based on attention U-Net for estimating depth from a PX image, a realignment module for aligning the predicted flattened volume to the shape of jaw using a predefined focal trough and ray data, and lastly a refinement module based on 3D U-Net for interpolating the missing information to obtain a smooth representation of oral cavity. Synthetic PXs obtained from CBCT by ray tracing and rendering were used to train the networks without the need of paired PX and CBCT datasets. Our method, trained and tested on a diverse datasets of 600 patients, achieved superior performance to GAN-based models even with low computational complexity.