대한구강악안면방사선학회

Korean Academy of Oral and Maxillofacial Radiology

학회지

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계수공제영상의 비선형 대조도 증강효과에 관한 연구
저자 : 이건일, 진연화
1997년|27권 2호|Page : 83-90|조회수 732
Full Text : 1997_83.pdf (425.0K)
TI : Nonlinear contrast enhancement on subtraction images

AU : Lee KI; Jin YH
AD : Department of Oral & Maxillofacial Radiology, College of Dentistry, Wonkwang University
SO : JKOMFR. 1997;27(2):83-90
ISSN : 1225-049X
PY : 1997
LA : KOREAN
CP : KOREA

AB : This study was performed to demonstrate the effect of linear or nonlinear contrast enhancement on subtraction images. Three different textures were radiograped on dental film. The first radiograph was taken without the presence of an object. the second, which showed trabucular bone, was taken of the molar area of a human. the third radiograph was taken of the coronal part of molars. Each film was digitized into a 1312 x 1024 pixel x 8 bit depth matrix by means of a Nikon 35 mm film scanner(LS-3510AF, Japan) with fixed gain and internal dark current correction to maintain constant illumination. The scanner was interfaced to a Macintosh LC III computer(Apple Computer, Charlotte, N.C.). This resulted in three pairs of images, including different textures-plain, bone and enamel. Digital regular, linearly and nonlinearly enhanced subtraction was performed. Computer software was used to simulate lesions in the shape of a 2D-Gaussian curve on each of a pair of images. The each subtraction images were presented in a random sequence to two groups of 10 observers(students and dentists). ROC analysis was used to compare observer performance.
The following results were obtained ;
1. All of LCE subtraction, equalized subtraction and regular subtraction images of plain texture were diagnosed the best by far.
2. The data revealed a siginificant LCE effect in both the student group and the expert group.
3. Clinical expertise was a helphul factor for the observers in this study.

회비납부계좌 : 신한은행 100-031-466747 (예금주:대한영상치의학회) 입금 시
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