http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Orthophantomograph에 있어서 像層面積에 關한 硏究
金在德,崔鍾浩 大韓口腔顎顔面 放射線學會 1991 Imaging Science in Dentistry Vol.21 No.1
In the study of the focal trough of panoramic radiograph using Panoura Eight-S(the Yoshida company), a series of 63 X-ray films were taken with the 8-19 metal pins placed in the holes of the plastic model plate and evaluated by 4 observers. The author analyzed the focal trough defined by the sharpness criteria and calculated dimension of focal trough in the horizontal plane. The results were as follows; 1. Focal trough was not continued in the anterior region within a very high degree of sharpness. 2. With optional sharpness, the width of anterior and posterior focal trough was approximately 13mm and 60mm respectively. 3. The focal trough was narrow in the anterior region and was flared laterally with symmetry in posterior region. 4. Sharp image began to show at the position of 18mm posteriorly from the most anterior position of chin rest.
Orthopantomogram의 像層面積에 있어서의 像擴大에 關한 硏究
李鍾福,金在德 大韓口腔顎顔面 放射線學會 1991 Imaging Science in Dentistry Vol.21 No.1
In the study of magnification of image in the focal trough of panoramic radiography, (Yoshida company Panoura-Eight-s), a series of 63 x-ray films were taken with the 8-19 metal pins placed in the holes of the plastic plate, measured and evaluated by 4 observes. The author analyzed the vertical and horizontal magnification rate in the corrected focal trough. Results were as follows: 1. For vertical measurements, magnification rates were minimum 10% maximum 36% and the magnification for image of medial side was larger than that of image of lateral side from image layer. 2. For horizontal measurements, magnification rates were minimum-14% maximum 46% and images of medical side from focal trough were magnified and images oflateral side from focal trough were retrenched. 3. When moved 10mm downward accusal layer, interspace was somewhat narrow between the pins and upper sides of pins were horizontally magnified but images of the end parts of pins showed tapered form. 4. When moved 10mm downward from the occlusal layer, opposite images showed overlapping.