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개인용 컴퓨터에서 재구성한 3차원 전산화단층영상의 두부계측 재현성
전국진,박혁,이희철,김기덕,박창서,Jeon Kug-Jin,Park Hyok,Lee Hee-Cheol,Kim Kee-Deog,Park Chang-Seo 대한영상치의학회 2003 Imaging Science in Dentistry Vol.33 No.3
Purpose: The purpose of this study was to report the reproducibility of intra-observer and inter-observer consistency of cephalometric measurements using three-dimensional (3D) computed tomography (CT), and the degree of difference of the cephalometric measurements. Materials and Methods: CT images of 16 adult patients with normal class I occlusion were sent to personal computer and reconstructed into 3D images using V-Works 3.5/sup TM/(Cybermed Inc., Seoul, Korea). With the internal program of V-Works 3.5/sup TM/, 12 landmarks on regular cephalograms were transformed into 21 analytic categories and measured by 2 observers and in addition, one of the observers repeated their measurements. Intra-observer difference was calculated using paired t-test, and inter-observer by two sample test. Results: There were significant differences in the intra-observer measurements (p < 0.05) in four of the categories which included ANS-Me, ANS-PNS, Cdl-Go (Lt), GoL-GoR, but with the exception of Cdl-Go (Lt), ZmL-ZmR, Zyo-Zyo, the average differences were within 2 mm of each other. The inter-observer observations also showed significant differences in the measurements of the ZmL-ZmR and Zyo-Zyo categories (p < 0.05). With the exception of the Cdl-Me (Rt), ZmL-ZmR, Zyo-Zyo categories, the average differences between the two observers were within 2 mm, but the ZmL-ZmR and Zyo-Zyo values differed greatly with values of 8.10 and 19.8 mm respectively. Conclusion: In general, 3D CT images showed greater accuracy and reproducibility, with the exception of suture areas such as Zm and Zyo, than regular cephalograms in orthodontic measurements, showing differences of less than 2 mm, therefore 3D CT images can be useful in cephalometric measurements and treatment planning.
전국진(Kug Jin Jeon) 대한치과의사협회 2019 대한치과의사협회지 Vol.57 No.11
On account of the dentistry mainly deals with hard tissues such as teeth and bones, CBCT and CT are common imaging modality in clinics. Recently, insurance coverage of MRI has been extended to head and neck region. In addition, unlike CBCT or CT, ionizing radiation is not used, the demand for MRI is gradually increasing in dentistry. Even though, many dentists still think that MRI is a difficult diagnostic tool and they are not confident when to use it. Therefore, the objective of this manuscript is to help the dental clinicians to access easily on MRI by introducing the overview, application and precautions of this imaging tool.
Multi-layer image 소프트웨어를 사용한 파노라마방사선영상의 임상적 활용
전국진(Kug Jin Jeon),김재훈(Jae Hun Kim),이정희(Jeong-Hee Lee),김영현(Young Hyun Kim),한상선(Sang-Sun Han) 대한치과의사협회 2018 대한치과의사협회지 Vol.57 No.1
Panoramic radiography is widely used as a primary radiological diagnosis in dentistry. However, due to the overlapping of anatomical structures, diagnostic capability of panoramic radiography is limited. Recently, panoramic machine equipped with various image processing software has been introduced to improve the diagnostic capability. This study aims to introduce panoramic equipment with multi-layer imaging software that can provide 41 images from anterior to posterior in region of interest, and to report in various clinical applications.
김진태,조명철,전국진,박광호,허종기,Kim, Jin-Tae,Cho, Myung-Chul,Jeon, Kug-Jin,Park, Kwang-Ho,Huh, Jong-Ki 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.2
Impacted third molars of the mandible are generally found at or close to the second molar. If the third molar is impacted far distant from its original site, it may be affected by cysts or tumors. Ectopic impaction of third molar in the condyle area is very rare. Furthermore, impaction without cystic lesion is even less common. The etiology of migration of the mandibular third molar without cystic lesion is unknown. So periodical X-ray taking is essential.
조명철,허종기,홍순원,김진태,전국진,김형곤,Cho, Myung-Chul,Huh, Jong-Ki,Hong, Soon-Won,Kim, Jin-Tae,Jeon, Kug-Jin,Kim, Hyung-Gon 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.3
활액낭은 측두하악관절에 매우 드물게 나타나는 질환으로 본 증례는 개구제한을 주소로 내원하여 측두하악관절장애로 의심하고 자기공명 영상검사를 시행하였다. T2강조영상에서 좌측 측두하악관절강내에 다량의 활액이 관찰되었으나 전형적인 활액막 연골종증과 달리 상하관절강내의 활액이 격벽에 의해 분리되어 있었으며 수술시 낭성 병변이 관찰되었다. 조직학적으로 낭주위가 활액세포로 이장되어 있는 진성낭이었으며 낭벽내에 신생혈관 및 염증세포의 침윤이 관찰되어 염증성 활액낭으로 최종 진단하였다. 이 증례는 특징적인 자기공명영상소견을 나타내었지만 타 질환과 감별에 많은 어려움이 있었다. 치료는 병소의 적출을 시행하였으며 추적관찰기간 동안 재발은 보이지 않았다. Temporomandibular joint cysts usually occur between the second and fourth decade of life. There is a female predominance to male of approximately 3 to 1. The patients complain of swelling, pain and sometimes decreased mouth opening. Synovial cysts of the temporomandibular joint seem to develop by an increase of intraarticular pressure due to trauma or inflammation which causes capsular herniation. However, if inflammatory synovial cysts develop by an increase of synovial fluid into inflammation tissue in the capsule without capsular herniation, a differential diagnosis should include synovial chondromatosis and synovitis. This is a case report of a synovial cyst developed in a capsule of the temporomandibular joint.
허준영(Jun-Young Hur),김종윤(Jong-Yoon Kim),임재형(Jae-Hyung Lim),전국진(Kug-Jin Jeon),김형곤(Hyung-Gon Kim),허종기(Jong-Ki Huh) 대한구강악안면외과학회 2009 대한구강악안면외과학회지 Vol.35 No.6
Villonodular synovitis, also called pigmented villonodular synovitis, is the benign lesion with the characteristic of locally aggressive proliferation of mononuclear histiocyte and giant cell. Typically it involves single joint, especially about 80% of disease occurs in the knee joint. Villonodular synovitis of the temporomandibular joint is very rare disease. Differential diagnosis includes synovial chondromatosis and tumors of the temporomandibular joint. Optimal treatment consists of complete excision of the mass and removal of the synovium including adjacent affected bony structures. This is a case report of villonodular synovitis developed in the temporomandibular joint.
이충상(Choong-Sang Lee),김형근(Hyoung-Keun Kim),임재형(Jae-Hyung Lim),전국진(Kug-Jin Jeon),허종기(Jong-Ki Huh) 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.3
Epidermoid cysts presents as a nodular and fluctuant subcutaneous lesion beneath the skin and are most common in acne-prone areas of the head, neck and back. This cyst often arises after localized inflammation of the hair follicle and occasionally after the implantation of epithelium following trauma and surgery including a biopsy procedure. It is often associated with Gardner syndrome, particularly before puberty. The lesion is normally treated by a surgical excision or enucleation, and recurrence is uncommon. A 27 year old woman complained of a swelling of the left parotid gland when she visited our clinic. A cystic lesion was found in the left parotid gland from the high signal intensity on the MR images. Ultrasonography showed that the cystic lesion was heterogeneous echogenic. Six months earlier, botulinum toxin was injected in her left masseter muscles six months earlier and progressive swelling of the left parotid area was noticed four months after treatment. The lesion was surgically removed. It was encapsulated by a thin wall and filled mainly with keratin. The final diagnosis was an epidermoid cyst.
구내 표준 방사선사진을 이용한 구내방사선촬영기의 선질 평가
이상섭,권혁락,심우현,오승현,이지연,전국진,김기덕,박창서 대한구강악안면방사선학회 2000 Imaging Science in Dentistry Vol.30 No.3
Purpose : This study was to evaluate the beam quality of intraoral X-ray equipments used at Yonsei University Dental Hospital (YUDH) using the half value layer (HVL) and the characteristic curve of intraoral standard X-ray film. Materials and Methods : The study was done using the intraoral X-ray equipments used at each clinical department at YUDH. Aluminum filter was used to determine the HVL. Intraoral standard film was used to get the characteristic curve of each intraoral X-ray equipment. Results : Most of the HVLs of intraoral X-ray equipments were higher than the least recommended thickness, but the REX 601 model used at the operative dentistry department and the X-707 model used at the pediatric dentistry department had HVLs lower than the recommended thickness. The slopes of the characteristic curves of films taken using the PANPAS 601 model and REX 601 model at operative dentistry department, the X-705 model of prosthodontic dentistry department, and the REX601 model at the student clinic were relatively low. Conclusion : HVL and the characteristic curve of X-ray film can be used to evaluate the beam quality of intraoral X-ray equipment. In order to get the best X-ray films with the least radiation exposure to patients and best diagnostic information in clinical dentistry, X-ray equipment should be managed in the planned and organized fashion. (Korean J Oral Maxillofac Radiol 2000; 30: 183-188)