• 한국임상수의학회지
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• 제37권4호
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• pp.227-230
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• 2020

A 8-year-old spayed female Korean short-haired cat was presented with respiratory distress. CBC, serum chemistry analysis, plain radiography, and abdominal ultrasonography were performed. Besides hypertrophic cardiomyopathy (HCM) suspected by the thoracic radiograph, a tubular, tortuous soft tissue structure was detected at the region of the left retroperitoneal cavity on the abdominal radiograph. On the abdominal ultrasonography, a shunt vessel is identified caudo-lateral to the left kidney region. These findings are consistent with spleno-systemic shunts in cats. Furthermore, portal hypertension and diffuse hepatic lesion were also identified. Although the cause of a shunt vessel is not easy to diagnose, it is important to include spleno-systemic shunt into differential diagnosis list, when convoluted, tubular soft tissue opacity is seen on the digital radiography (DR). This report will allow clinicians to raise awareness of complications of portosystemic shunt (PSS) and better treat PSS suspected feline patients when the advanced modalities such as computed tomography and magnetic resonance imaging are not available.

• 대한소아치과학회지
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• 제38권3호
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• pp.237-243
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• 2011

이번 연구의 목적은 소아환자의 골격성숙도 평가를 위해 경추골과 수완부골 방사선 사진의 상호연관도를 연구하는 것이다. 성적인 특징, 연령, 치아 발육, 신장, 체중과 골격성장은 성장 단계를 확인하기 위해 사용되는 일반적인 방법이다. 청소년기 전이나 청소년기 동안 성장잠재력에 대한 평가는 매우 중요하다. 본 연구는 6~18세 아동을 대상으로 측면 두부 방사선 사진과 수완부골 방사선 사진을 촬영하여 골격성숙 단계를 비교 평가하였다. 1. 일반연령은 Skeletal Maturity Indicators(SMI)와 Cervical Vertebrae Maturation(CVM)에 비하여 적절한 골격성숙도 표시자가 되지 못하였다. 2. SMI와 CVM의 골격성숙도는 여자의 경우 남자에 비해 더 빨랐다. 3. SMI 1, 2는 CVM 1, SMI 3, 4는 CVM 2, SMI 5, 6은 CVM 3에 해당하는 연관관계가 나타났다. 4. SMI와 CVM에 대한 측정자의 재현성 및 신뢰도는 우수하였다. 이상의 결과로 CVM도 SMI와 같이 교정치료에 있어 골격성숙도를 평가하는 적절한 방법이 될 수 있다.

• 대한치과보철학회지
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• 제36권2호
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• pp.323-335
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• 1998

Clinically, the curve of Spee is widely applied as a determined level of the occlusal curvature when the oral rehabilitation and the reconstruction of the prosthesis is needed at the malalignment dentition due to the missing, extrusion, and the inclination of the teeth. The purpose of this study was to analyze the curve of Spee of the occlusal curvature which influences to the occlusal form and the location three dimensionally, and then was to measure the radius and the degree of curvature of the curve of Spee and also was to investigate the influence to the cuspal inclination according to the change of the inclination of the curve of Spee which was analyzed by AutoCAD R.13 program at the gnathological cast and the cephalometric radiograph. The following results were obtained : 1. The radius of the curve of Spee was the mean of $11.74{\pm}3.64cm$ in the model, $12.75{\pm}4.63cm$ in the radiograph and there was no significant difference statistically between the model and the radiograph(P>0.001). 2. The radius and the degree of curvature of the curve of Spee showed negative correlation(r=-0.80), while the radius and the degree of curvature of the curve of Spee in relation to the length of the curve of Spee did not show correlation. 3. The case of the curve of Spee inclined to the posterior, that is. $Post.M{\theta}$ group showed the mean of $4.73{\pm}3.64$, positive correlation to the P2m, M1mm, M1dm, M2dm, and especially the greatest correlation coefficient to the mesial inclination angle of the mesio-buccal cusp tip of the first molar(r=0.70). 4. The case of the curve of Spee inclined to the anterior, that is, $Ant.M{\theta}$ group showed the mean of $3.28{\pm}3.59$, positive correlation to the P2m, M1mm, and also the greatest correlation coefficient to the mesial inclination angle of the mesio-buccal cusp tip of the first molar(r=0.78

• 보험의학회지
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• 제20권
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• pp.91-97
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• 2001

• 치과방사선
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• 제22권1호
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• pp.117-127
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• 1992

This investigation was performed to test the readability of the video based digital radiography, that can be applied clinically, compared with the periapical radiograph. The experiments were performed with IBM-PC/AT compatible, video camera and ADC (analog-digital converter). And spatial resolution was 512 X 480 with 256 (8 bit) gray levels. The radiographs obtained by using variable steps of exposure time were digitized. and then the digital images were analyzed. The obtained results were as follows: 1. There was no remarkable difference in readability between the radiographs and their digital images. However, under over exposure the digital images were superior to the radiographs in readability and vice versa. 2. As the exposure time was increased, the gray level of the digital image was decreased proportionally. 3. The correlation beween the regions of interest and the aluminum step wedges were relatively close; R=0.9965 (p <0.001).

• 치과방사선
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• 제22권1호
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• pp.67-75
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• 1992

Transcranial radiograph is widely used in the diagnosis of craniomandibular disorder because it can be used by the dentist with relative ease in spite of image distortion. But correct information can be obtained only when one know the image change by projection angulation. The author compared the condyle position in the 3 groups of transcranial radiographs (horizontal angulation - 0°, 5°, individualized) with that in the individualized corrected lateral tomogram by objective and subjective evaluation methods. The results were as follows: 1. Among 3 transcranial groups, the condyle position in individualized group showed the highest concordance rate with that in the tomogram group in objective and subjective evaluation methods. 2. Correlation coefficient between individualized transcranial group and tomogram group in objective evaluation method was highest (P≤0.01). 3. Image clarity in individualized transcranial group was worse than that of the other two transcranial groups.

• 한국정밀공학회지
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• 제9권4호
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• pp.65-71
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• 1992

This paper develops an algorithm for efficiently computing the intersection points between rays and an object in a simulated radiograph. This algorithm allows interactive calculation of simulated radiographs for very complex parts. It needs a geometric model of a part which is approximated by a bounding surface made up of flat triangular polygons. Since rays have a point source, a perspective transformation is applied to convert the point source problem to one that has parallel rays. This permits to use a scan-line algorithm which utilizes the coherence of the grid of rays for the intersection calculations. The efficiency of the algorithm is shown by comparing compute time of the intersection calculations to a commercial software that computes each ray intersection independently.

• Imaging Science in Dentistry
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• 제31권1호
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• pp.23-34
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• 2001

Purpose : To develop a new subtraction program for registering digital periapical images based on the correspondence of anatomic structures. Materials and Methods: The digital periapical images were obtained by Digora system with Rinn XCP equipment after translation of 1-16 mm, and rotation of 2-20° at the premolar and molar areas of the human dried mandible. The new subtraction program, NIH Image program and Emago/Advanced program were compared by the peak-signal-to noise ratio (PSNR). Results : The new subtraction program was superior to NIH Images program and Emagol Advanced program up to 16 mm translation and horizontal angulation up to 4°. Conclusion: The new subtraction program can be used for subtracting digital periapical images.

• 치과방사선
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• 제23권2호
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• pp.207-211
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• 1993

The auther has evaluated the panoramic image of the mandibular condyle according to its horizontal codylar angle(0°, 10°, 20°, 30°, 40°) and intercondylar distance( 9.5, 11.0, 12.5, 14.0㎝). The Results were as follows: 1. In all horizontal condylar angle, the farther the intercondylar distance was, the smaller the horizontal length in radiogram was. 2. The increased the horizontal condylar angle was, the longer in horizontal direction and the shorter in vertical direction the image of superior condylar surface was. 3. In case of large horizontal condylar angle, the real mesial surface of condyle was projected to the posterior surface on radiograph.

• Imaging Science in Dentistry
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• 제31권2호
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• pp.67-71
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• 2001

Purpose: To assess the possibility of using panoramic indices as an indicator of jaw osteoporosis. Methods: Mandibular cortical width (MCW), degree of mandibular alveolar bone resorption (ABR) and morphology of mandibular inferior cortex (MIC) on panoramic radiograph were used as panoramic indices. These panoramic indices were compared with bone mineral density (BMD) of lumbar (L1-L4) and femoral neck measured by dual energy X-ray absorptiometry. We also compared MCW and ABR of young men with those of postmenopausal women. Results : There was a significant correlation between ABR and BMD of lumbar and femoral neck. And also significant correlation between MIC and BMD of lumbar and femoral neck. ANOVA test of BMD of lumbar and femoral neck showed significant differences according to morphologic classification of inferior cortex. There was significant difference in MCW and ABR between young men and postmenopausal women. Conclusion: Our results suggested that ABR and MIC on panoramic radiograph could be reliable in screening of osteoporosis.