• 한국임상수의학회지
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• 제19권3호
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• pp.367-370
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• 2002

A female, 14-year-old mixed dog weighing 4 kg and a female,8-year-old schnauzer dog weighing 6 kg showing vaginal discharges and vomiting for a few weeks were examined for the preoperative check of anterior cruciate ligament rupture and the recheck after the surgery of nephrectomy. There were no distinct abnormal signs except for the increased CBC at schnauzer dog on blood chemistry analysis. Radiographic and ultrasonographic findings were a large abdominal mass and a cyst-like hypoechogenic or anechogenic cavitary lesion on the ovary region. These findings were consistent with an ovarian cyst. Thereafter highly suspected ovarian cysts by diagnostic imaging were supported by high estrogen concentration on hormonal assay and the results of Pathologic examination as the unilateral ovarian cysts with secondary pyometra.

• 대한소아치과학회지
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• 제51권1호
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• pp.1-10
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• 2024

Deep learning algorithms are becoming more prevalent in dental research because they are utilized in everyday activities. However, dental researchers and clinicians find it challenging to interpret deep learning studies. This review aimed to provide an overview of the general concept of deep learning and current deep learning research in dental radiographic image analysis. In addition, the process of implementing deep learning research is described. Deep-learning-based algorithmic models perform well in classification, object detection, and segmentation tasks, making it possible to automatically diagnose oral lesions and anatomical structures. The deep learning model can enhance the decision-making process for researchers and clinicians. This review may be useful to dental researchers who are currently evaluating and assessing deep learning studies in the field of dentistry.

• 대한족부족관절학회지
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• 제18권2호
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• pp.62-67
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• 2014

Purpose: Reconstructive surgeries for equinocavovarus foot deformities are quite variable, including hind-midfoot osteotomy or arthrodesis, soft tissue procedure, tendon transfers, etc. Comprehensive evaluation of the deformity and its etiology is mandatory for achievement of successful deformity correction. Few studies in this field have been reported. We report on the clinical and radiographic outcome of reconstruction for cavovarus foot deformities. Materials and Methods: The study is based on 16 feet with cavovarus foot deformities that underwent bony and soft tissue reconstructive surgery from 2004 to 2008. We evaluated the etiologies, varieties of surgical procedures performed, pain score, functional scores, and patient satisfaction and measured the radiographic parameters. Results: The average age at the time of surgery was 39.4 years old, with a male/female ratio of 9/4 and an average follow-up period of 23.9 months (range, 12~49 months). The etiologies of the cavovarus deformity were idiopathic 7 feet, residual poliomyelitis 5 feet, Charcot-Marie-Tooth disease 2 feet, and Guillain-Barre syndrome and hemiplegia due to cerebrovascular accident sequela 1 foot each. Lateral sliding calcaneal osteotomies were performed in 12 feet (75%), followed by Achilles tendon lengthening and plantar fascia release in 11 feet (69%), and first metatarsal dorsiflexion osteotomy/arthrodesis and tendon transfer in 10 feet (63%). Visual analogue scale pain score showed improvement, from an average of 4.2 to 0.5 points. American Orthopaedic Foot and Ankle Society ankle-hindfoot score showed significant improvement, from 47.8 to 90.0 points (p<0.05). All patients were satisfied. Ankle range of motion improved from $27.5^{\circ}$ to $46.7^{\circ}$. In radiographic measurements, calcaneal pitch angle improved from $19.1^{\circ}$ to $15.8^{\circ}$, Meary angle from $13.0^{\circ}$ to $9.3^{\circ}$, Hibb's angle from $44.3^{\circ}$ to $37.0^{\circ}$, and tibio-calcaneal axis angle from varus $17.5^{\circ}$ to varus $1.5^{\circ}$ Conclusion: We achieved successful correction of cavovarus foot deformities by performing appropriate comprehensive reconstructive procedures with improved functional, radiographic measures and high patient satisfaction.

• Journal of Periodontal and Implant Science
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• 제33권4호
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• pp.615-624
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• 2003

The most accurate method to assess bone level is the histometric measurement. However it causes discomfort in patients and damage to the regenerated tissues. in the present study, we used 4 type regenerative therapies, The present study evaluated the clinical reliability and accuracy of bone probing measurements and radiographic bone level in the assessment of bone level by comparing those results with histometric confirmed bone level. Twentyfour(24) intrabony defects(4${\times}$4mm 1-wall intrabony defects) were surgically created in the mandibular second and fourth premolars of 6 beagle dogs. The control group underwent a conventional flap operation. Experimental group I was treated with calcium phosphate glass only, and while experimental group 2 was treated with GTR and experimental group 3 was treated with calcium phosphate glass and GTR. The subjects were sacrificed 8 weeks after the operation and a bone probing measurements, radiographic measurement and histometric measurement was performed. The correlation between bone probing measurements(BP) and histometric measurement(HL), and radiographic measurement(RL) and histometric measurement(HL) were analyzed with Spearman's rank correlation analysis and the statistical significance with respect to the type of regenerative therapies was analyzed with the Kruskal Wallis test. The coefficient of correlation to HL was 0.73 for RL and 0.90 for BP. The type of regenerative therapies had no significant effect on the difference between HL and other measurements. The results of this study suggests that bone probing measurements most closely represents actual bone level. So bone probing measurements may be a good clinical method for assessing the hone level following any type of periodontal regenerative therapies.

• 대한방사선기술학회지:방사선기술과학
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• 제37권3호
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• pp.169-175
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• 2014

2013년 국민건강보험심사평가원의 의료기관 데이터베이스에 따르면 1118개의 병.의원에 영상의학과가 개설되어있다. 이들 병원에는 CT, 투시촬영장치, 일반촬영장치와 같은 의료용 방사선 발생장치가 운영되고 있다. 이 중에서도 일반촬영장치는 가장 많은 병원에서 운영되고 있는 장비이다. 일반촬영장치의 경우 film-screen 장치에서 digital radiography 로 급격하게 변하고 있다. 하지만 그 촬영기법은 films-screen 기법을 그대로 사용하고 있어 디지털 장치의 맞는 촬영기법의 개발을 위한 전반적인 실태 조사가 필요하다. 이에 본 연구에서는 국내 의료기관의 일반촬영기법에 관한 조사를 시행하여 실제 병원에서 사용하고 있는 일반촬영기법의 기술적 항목에 대한 현황을 파악하여 보았다. 본 연구에서는 의료기관에서 일반적으로 사용되는 일반촬영기법 26개에 대한 촬영기법의 전국 단위 조사에서 흉부, 두부, 척추, 골반에 해당하는 검사에 대한 분석을 시행하였다.

• 대한치과교정학회지
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• 제32권1호통권90호
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• pp.59-69
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• 2002

본 연구는 측모두부방사선규격사진의 디지털 영상을 enhancement하였을 때 계측점 설정의 재현도를 비교 평가하여 두부방사선사진 계측점 설정에 도움이 되고자 시행되었다. 10명의 측모두부방사선규격사진을 촬영하여 컴퓨터에 입력하고 Quick Ceph Image Pro$^{TM}$에서 gray-scale equalization number를 50으로, detail enhancement number를 50으로 설정하여 방사선상을 4단계까지 enhancement하였다. 5명의 조사자가 모니터 상에서 32개의 계측점을 설정하고 방사선상의 각 enhancement 단계에서 각 계측점에 대해 5명의 조사자가 설정한 점과 이 점들의 중심점간의 거리인 편위량으로 조사자간 계측점 설정의 재현도를 비교 평가하여 다음과 같은 결과를 얻었다. 1. Enhancement를 하지 않은 방사선상에서 조사자간 재현도는 계측점에 따라 다양하게 나타났다. 2. 방사선상 enhancement 따른 계측점의 편위량을 비교한 결과, 5개의 계측점에서 방사선상의 enhancement 단계간에 조사자간 계측점 설정의 재현도가 통계적으로 유의한 차이를 보였다. 3. 계측점 pterygomaxillary fissure는 enhancement 단계 1과 2의 방사선상에서, 계측점 Posterior nasal spine은 enhancement 단계 1의 방사선상에서, 계측점 menton은 enhancement 단계 2, 3과 4의 방사선상에서 조사자간 계측점 설정의 재현도가 enhancement하지 않은 영상에 비하여 높게 나타났다. 이상의 결과로 모니터 상에서 측모두부방사선규격사진의 계측점 설정시 디지털 방사선상의 enhancement를 통하여 일부 계측점에서 재현도를 증가시킬 수 있음을 알 수 있었다.

• 대한치과의사협회지
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• 제56권9호
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• pp.462-478
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• 2018

임플란트와 지대주 간에 허용가능한 적합도를 넘는 부적합을 발견하고 이에 대처하는 것은 중요한 과제이다. 부적합을 임상에서 평가하고 발견하는 방법은 대부분 부적합의 정성적 평가에 치중하고 있으며 술자의 숙련도에 의존하고 있어 정확한 평가방법이라고 하기는 어렵다. 부적합의 정도를 판단하고 원인을 실험적으로 분석하는 방법 중 본 문헌고찰에서는 광탄성 분석법, 유한요소분석법, 스트레인게이지, 미생물 균체 분석 등 조건을 모형화하여 분석하는 모형화법과 사진 측량, 삼차원 좌표 측정, 현미경분석 및 방사선분석을 통해 부적합의 정도를 정밀하게 측정하는 수치법을 각각 설명하고 그 장단점 및 적용의 한계를 분석하였다. 지금까지 살펴본 실험실 부적합 평가 방법들을 장, 단점 및 정확도와 재현성을 기준으로 표로 정리한 것이 Table 3이다. 어떤 방법도 모든 경우에 적용할 수 있을 정도로 완벽하지는 않으므로 평가하고자 하는 부적합의 특성에 따라 적절한 평가방법을 선택하여 적용하는 것이 필요하다고 사료된다.

• Imaging Science in Dentistry
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• 제33권2호
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• pp.113-119
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• 2003

Purpose : To evaluate the relationship between morphometric analysis of bone microstructure from digital radiographic image and trabecular bone strength. Materials and Methods : One hundred eleven bone specimens with 5 mm thickness were obtained from the mandibles of 5 pigs. Digital images of specimens were taken using a direct digital intraoral radiographic system. After selection of ROI (100 × 100 pixel) within the trabecular bone, mean gray level and standard deviation were obtained. Fractal dimension and the variants of morphometric analysis (trabecular area, periphery, length of skeletonized trabeculae, number of terminal point, number of branch point) were obtained from ROI. Punch sheer strength analysis was performed using Instron (model 4465, Instron Corp., USA). The loading force (loading speed 1 mm/min) was applied to ROI of bone specimen by a 2 mm diameter punch. Stress-deformation curve was obtained from the punch sheer strength analysis and maximum stress, yield stress, Young's modulus were measured. Results: Maximum stress had a negative linear correlation with mean gray level and fractal dimension significantly (p<0.05). Yield stress had a negative linear correlation with mean gray level, periphery, fractal dimension and the length of skeletonized trabeculae significantly (p < 0.05). Young's modulus had a negative linear correlation with mean gray level and fractal dimension significantly (p < 0.05). Conclusions : The strength of cancellous bone exhibited a significantly linear relationship between mean gray level, fractal dimension and morphometric analysis. The methods described above can be easily used to evaluate bone quality clinically.

• 한국방사선학회논문지
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• 제12권6호
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• pp.745-753
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• 2018

방사선이 다양한 분야에 사용됨에 따라 방사선작업종사자의 수가 증가하고 있으며, 이에 따라 종사자의 안전에 대한 우려도 높아지고 있다. 국내에서는 KISOE 시스템, 발주자보고 등을 통해 종사자의 안전 확보에 주력하고 있다. 선행연구에서는 종사자 및 업체의 안전 확보를 위한 위험성 평가에 피폭선량과 더불어 이외의 항목에 대한 추가적 평가가 효과적일 것이라고 판단하여 평가를 위한 항목들 및 방사형 척도분석 모델을 개발하였다. 이에 본 연구에서는 2016년 방사선투과검사업체의 자료를 방사형척도분석 모델에 적용하여 실제 업체의 위험성 평가를 수행하였다. 또한 위험성이 낮을 것으로 예상되는 업체 2곳과 위험성이 높을 것으로 예상되는 업체 2곳을 선정하여 위험성 분석을 수행하였다. 분석 결과에서 예상과 동일한 결과를 얻어 모델의 타당성을 확인할 수 있었다. 전체 56개 업체의 위험성 평가가 수행되었고 업체별 문제점에 따른 개선 및 점검사항을 예측하였다. 본 연구 결과를 방사선투과검사업체 및 규제기관에서 자체 평가 및 규제 기준 등으로 활용할 수 있을 것으로 예상된다.

• 치과방사선
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• 제21권2호
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• pp.249-259
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• 1991

The purpose of this study was to evaluate the incidence and radiographic features of 677 cases of hypercementosis by means of the analysis of full mouth periapical radiograms in 4,236 persons visited the Department of Oral Radiology, School of Dentistry, Kyung Hee University during January 1984 to December 1989. The obtained results were as follows: 1. The incidence of hypercementosis was revealed to be 8.2% in total examined persons, and there was a higher incidence in females (9.4%) than in males (7.1%). 2. The hypercementosis was most frequently occurred in the 6th decades (29.2%), and the incidence was increased by advancing age until 6th decades. 3. There was a higher incidence in the maxilla (59.5%) than in the mandible (40.5%), and maxillary second premolar (18.5%) was the most frequently involved tooth. The maxillary first premolar (11.7%) was next in order to frequency followed by maxillary canine (10.0%) and mandibular first and second premolars (9.6%). 4. In the etiologic factors, 35.0% were inflammation, 31.2% were elongation, 6.2% were trauma from occlusion, 0.1 % were uneruption, and 27.5% were unknown. 5. In the degree of cementum apposition, 35.3% were Type Ⅰ, 29.5% were Type Ⅱ, and 35.2% were Type Ⅲ. 6. In the status of cementum apposition, 3.2% were mesial side, 8.9% were distal side, and 87.9% were mesial & distal side. 7. In the identification of radiographic density between normal cementum and excessive cementum, 12.7% could be identified, and 87.3% could be unidentified.