The prevalence, clinical and radiographic characteristics of cemento-osseous dysplasiain Korea

조봉혜,정연화,나경수 대한영상치의학회 2007 Imaging Science in Dentistry Vol.37 No.4

Purpose: This study was intended to estimate the prevalence of cemento-osseous dysplasia (COD) in the Koreanpopulation and to assess the clinical and radiographic characteristics of this condition.Materials and Methods: Panoramic radiographs from 10,646 patients(4,982 males and 5,664 females, age rangefrom 6 to 91 years) were reviewed for evidence of COD. Their demographics, clinical characteristics, and radio-graphic features were retrospectively assessed.Results: Of 10,646 panoramic radiographs, 33 radiographs(0.31%) exhibited evidence of COD. The prevalence ofplasia(FCOD) and 17 had focal COD. Due to the multiplicity of FCOD, a total of 63 COD lesions were assessed.These lesions were most common in the mandibular molar area. Most of the COD lesions examined (61.9%) wereless than 10mm and the majority(82.5%) showed radiopacity.Conclusion : COD has a predilection for the mandibular molar area of middle-aged and older women. (Korean JOral Maxillofac Radiol 2007; 37 : 185-9)

하악 과두의 골변화에 대한 파노라마 및 경두개 촬영법 평가 : 콘빔 CT와의 비교 : Evaluation of panoramic and transcranial radiography on osseous changes of mandibular condyle : comparison with cone-beam CT

조봉혜 부산대학교 병원 암연구소 2014 부산대병원학술지 Vol.- No.36

중첩 불일치 평가기준으로서의 계수공제영상의 계조도 표준편차 연구

조봉혜 大韓口腔顎顔面 放射線學會 1999 Imaging Science in Dentistry Vol.29 No.2

Purpose : The aim of this study was to assess the validity of standard deviation of gray scale histogram in digital subtraction radiography as a test parameter for superimposition error. Materials and Methods : Twenty periapical radiographs were used as baseline images and they were copied to exclude the influence of exposure geomety and contrast differences. These subsequent images were linearly displaced by 0.1-0.5 mm in the x-, y- and xy-directions, rotated by 0.5-3°and distorted by angular contraction of 1-5° in x- and y-axis before subtraction. The standard deviations of gray levels in the subtraction images were obtained and paired t-tests were performed. Pearson correlation coefficients(r) were calculated between the standard deviations and the superimposition errors. Results : Linear displacement showed high correlation coefficients of 0.997, 0.997 and 0.995 in x-, y- and xy-axis respectively. Statistically significant different standard deviation existed among all linearly displaced groups(p<0.05). Distortion showed relatively low correlation coefficients of 0.982 and 0.959 in x- and y-axis. The standard deviations between the two distortion groups were statistically significant different(p<0.05). Conclusion : Standard deviation of gray level distribution in digital subtraction images is satisfactory but not perfect similarity measure to assess the superimposition errors.(J Korean Oral Maxillofac Radiol 1999;29:417-422)

악관절 단층촬영시의 두경부 주요 기관의 흡수선량

조봉혜 大韓口腔顎顔面 放射線學會 1999 Imaging Science in Dentistry Vol.29 No.2

Purpose : This study was done to evaluate the absorbed doses in organs of the head and neck for the conventional temporomandibular joint tomography. Material and Methods : Dosimetry was performed with 32 LiF thermoluminescent dosimeters, whcih were placed in a tissue-equivalent phantom when the temporomandibular joint was examined by both lateral and frontal temporomandibular joint tomography. Results : For lateral tomography, parotid gland and preauricular area towards tube showed relatively high absorbed dose of 1056.9 μGy and 519.9 μGy respectively. For frontal tomography, the two largest absorbed doses were 259.2 μGy in orbit towards tube and 212.0 μGy in lens towards tube. Conclusion : Conventional temporomandibular joint tomography showed relatively low absorbed doses on critical organs. Thus, responsible use of it may not be limited.(J Korean Oral Maxillofac Radiol 1999;29:411-416)

A Study of Ameloblastoma in Children and Adolescents

조봉혜,Cho Bang-Hae Korean Academy of Oral and Maxillofacial Radiology 1998 Imaging Science in Dentistry Vol.28 No.2

법랑모세포종은 흔히 중년에 호발하는 질환으로 알려져 있지만 아동 및 청소년에서도 그 발생이 보고되고 있다. 그러나 어린 환자들에 발생한 법랑모세포종의 임상적, 방사선학적 및 조직학적 분석은 드물다. 본 연구는 1984년 8월에서 1998년 5월 사이에 부산대학교병원에서 법랑모세포종으로 진단받은 46명의 환자들중에서 18세 이하 환자 15명에 대한 후향적연구로서 아동 및 청소년에서의 법랑모세포종의 특징을 기술하고자하였다. 그 결과는 다음과 같다. 1. 46례의 법랑모세포종중에서 15(32.6%)례가 18세 이하의 아동에서 발생하였으며, 남자 9(60%)명, 여자 6(40%)명으로 1.5: 1의 남녀비를 나타내었다. 2. 15례 모두 하악에 발생하였으며, 이 중 11(66.7%)례가 대구치부와 하악지에 나타났다. 3. 15례 모두 하악 종창의 주소를 보였다. 4. 방사선학적으로, 11(73.3%)례는 단방성 병소를, 4(27.7%)례는 다방성 병소를 나타내었다. 피질골 종창은 14(93.3%)례에서, 치근흡수는 11(73.3%)례에서 나타났다. 5. 조직학적으로 총상형이 7(46.7%)례, 단낭성형이 6(40%)례, 그리고 여포형이 2(13.3%)례 였다. A retrospective study of 15 cases of ameloblastoma in children and adolescents was performed. During the period of evaluation, 46 patients with ameloblastoma were seen, of which 15(32.6%) cases were in the patients aged 18 years or younger with the mean age of 14.5 years. There was more prevalence in male (1.5: 1). All the cases occured in the mandible, the molar and ramus area was the most frequent location(66.7%), and the most frequent sign was swelling of the face or jaw. Radiographically, 11(73.3%) cases manifested unilocular leion. Cortical expansion and root resorption were presented in 14(93.3%) and 11 (73.3%) cases respectively. Pexiform and plexiform unicystic types were common in the ameloblastoma occured in young patients.

Aggressive central odontogenic fibroma in the maxilla: A case report

조봉혜,정연화,황재준 대한영상치의학회 2022 Imaging Science in Dentistry Vol.52 No.4

A central odontogenic fibroma is a rare benign tumor composed of mature fibrous connective tissue with variable amounts of odontogenic epithelium. It appears at similar rates in the maxilla and mandible. In the maxilla, it usually occurs anterior to the molars. Radiographically, central odontogenic fibroma commonly presents as a multilocular or unilocular radiolucency with a distinct border. This paper reports a case of an aggressive central odontogenic fibroma involving the right posterior maxilla of a 53-year-old man. Radiographs showed an extensive soft tissue mass involving the entire right maxilla with frank bone resorption. The patient had a history of 2 operations in the region, both more than 2 decades ago. Although it was impossible to confirm the previous diagnoses, it was presumed that this case was a recurrent lesion.

Radiographic analysis of odontogenic cysts showing displacement of the mandibular canal

조봉혜 대한영상치의학회 2003 Imaging Science in Dentistry Vol.33 No.4

Purpose: To assess the radiographic findings of odontogenic cysts showing displacement of the mandibular canal using computed tomographic (CT) and panoramic images. Materials and Methods : CT and panoramic images of 63 odontogenic cysts (27 dentigerous, 16 odontogenic keratocysts, and 20 radicular cysts) were analyzed to evaluate the following parameters: the dimension and shape of the cysts, and the effect of the cysts on the mandibular canal and cortical plates. Results: Of the 63 cysts examined in the study, 35 (55.6%) showed inferior displacement of the mandibular canal and 46 (73.0%) showed perforation of the canal. There were statistically significant differences between CT and panoramic images in depicting displacement and perforation of the mandibular canal. Cortical expansion was seen in 46 cases (73.0%) and cortical perforation in 23 cases (36.5%). The radicular cysts showed cortical expansion and perforation less frequently than the other cyst groups. Conclusion: Large cysts of mandible should be evaluated by multiplanar CT images inorder to detect the mandibular canal and cortical bone involvement.

치아종

조봉혜,김애지,나경수 치과연구사 1989 치과연구 Vol.26 No.3

Prevalence of incidental paranasal sinus opacification in dental paediatric patients

조봉혜,정연화 대한영상치의학회 2008 Imaging Science in Dentistry Vol.38 No.4

Purpose : The purpose of this study was to determine the prevalence of sinus opacification among dental paediatric patients. Materials and methods : Two hundred and eight Cone Beam Computed Tomography (CBCT) scans of dental patients under the age of 18 were reviewed for sinus opacification. Patients with any sinus-related signs or symptoms were excluded. Results : The overall prevalence of sinus opacification was 48.1%. The ethmoid (28.4%) and maxillary (27.8%) sinuses were most frequently affected. There were no statistically significant differences for both age and gender. Conclusion : The high prevalence of sinus opacification in asymptomatic children emphasizes the necessity of clinical correlation. (Korean J Oral Maxillofac Radiol 2008; 38 : 219-23) Purpose : The purpose of this study was to determine the prevalence of sinus opacification among dental paediatric patients. Materials and methods : Two hundred and eight Cone Beam Computed Tomography (CBCT) scans of dental patients under the age of 18 were reviewed for sinus opacification. Patients with any sinus-related signs or symptoms were excluded. Results : The overall prevalence of sinus opacification was 48.1%. The ethmoid (28.4%) and maxillary (27.8%) sinuses were most frequently affected. There were no statistically significant differences for both age and gender. Conclusion : The high prevalence of sinus opacification in asymptomatic children emphasizes the necessity of clinical correlation. (Korean J Oral Maxillofac Radiol 2008; 38 : 219-23)

자가공명영상(Magnetic Resonance Imaging)의 기본원리

조봉혜,Cho Bong-Hae 대한영상치의학회 1999 Imaging Science in Dentistry Vol.29 No.1

Magnetic resonance imaging with its superior soft tissue contrast resolution and absence of beam hardening artifacts, combined with its ability to perform multiplanar imaging, is now effective tool in diagnostic imagings. Magnetic resonance is primarily a phenomenon that involves atomic nuclei. It provides totally new clinical informations with no known hazards through the use of very weak interactions with endogenous stable magnetic atomic nuclei. This article briefly summarizes the basic mechanism of generation and detection of the signals and general sorts of tissue properties which can influence the signals and thereby give rise to tissue contrast. It also describes how the machine-operating parameters can be used to manipulate the tissue contrast observed in the image.