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배영우,정병조,Bae, Young-Woo,Jung, Byung-Jo 대한의용생체공학회 2007 의공학회지 Vol.28 No.2
Polarization imaging systems have been widely used to selectively characterize skin lesions. Nevertheless, current systems are used in single-mode due to the limitations of a fixed polarization mode and a single-working distance of light source, in which uniform light distribution is achieved on target area. To address such limitations, we developed a variable polarization imaging system based on multi-working distance of light source for various clinical diagnoses. In this study, we characterize the imaging system and present experiment results demonstrating its clinical usefulness. The imaging system consists of a CCD color camera, linear polarization filters, and a single-layered LED ring light source which provides uniform light distribution at multi-working distances. The first polarizer was placed on the light source and the second polarizer placed on objective lens provides continuous linear polarization angle from $0^{\circ}\;to\;90^{\circ}$. The clinical efficacy of the imaging system was investigated by acquiring and analyzing clinical images of skin wrinkle and dental plaque. With the experiments, we verified the potential usefulness of the imaging system for other clinical applications.
여드름 환자의 얼굴에서 피지량, 여드름 병변수, 모공 형광밀도와의 상관 관계
홍승필 ( Seung Phil Hong ),한병관 ( Byung Kwan Han ),정병조 ( Byung Jo Jung ),배영우 ( Young Woo Bae ),최응호 ( Eung Ho Choi ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.9
Background: Porphyrins produced by Propionibacterium acnes exhibit an orange-red fluorescence spot on the pilosebaceous pore under UVA light. Based on this characteristic, the recently developed photographic technique, ``fluorescence photography``, warrants mention in the context of acne, especially in the assessment of the presence of bacteria and sebum output. Objective: The aim of this study was to assess the relationship between sebum output and acne lesion counts with fluorescent density (% fluorescence area). We discuss the possibility of the use of fluorescence photography as a new tool to evaluate acne and sebum levels. Methods: Total of 39 subjects, 29 males and 10 females, were recruited for this prospective study. To estimate fluorescent density, fluorescent facial images were taken and analyzed with digital fluorescent imaging system and an image analysis program. The sebum output level was measured with a Sebumeter(R). Numbers of acne lesions were counted. Also, sebum output and fluorescent images were compared before and after the use of a facial cleanser containing 1% triclosan. Results: Sebum output level was significantly associated with fluorescent density, but not with the number of acne lesions. However, in the group using triclosan containing cleanser, fluorescent density decreased, while sebum level increased. Therefore, fluorescent density seems to be influenced mainly by the density of P. acnes. Conclusion: Fluorescence density correlates with P. acnes mostly followed by sebum output level. Digital fluorescent imaging system is considered as a useful tool to assess sebum excretion as well as colonization of P. acnes. (Korean J Dermatol 2007;45(9):890∼897)