http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
방사선사진용 디지탈 영상시스템의 정량적 평가에 관한 실험적 연구
조형희,김은경 大韓口腔顎顔面 放射線學會 1994 Imaging Science in Dentistry Vol.24 No.1
A digital imaging system using Machintosh Ⅱ ci computer, high resolution Sony XC-77 CCD camera, Quickcapture Frame Grabber Board was evaluated for quantitative analysis of standardized periapical film with aluminum step wedge. The results were as follows: 1. Correlation between Al thickness and gray level was high-positively associated(r²=0.00. p<0.001). 2. Correlation between measured weight of experimental lesion and estimated relative lesion volume by digital subtracted radiography was also high-positively associated(r²=0.98, p<0.001). 3. As exposure time was increased, mean gray level was decreased(p<0.01) and slope of regression line between Al thickness and gray level was also decreased(p<0.01). And when the exposure time was shorter than 0.2 second, the value of r²was relatively low. On the basis of the above results, it is considered that this digital imaging system using a Macintosh Ⅱ ci computer & a high resolution CCD monochrome camera will be useful in evaluating digitized image from standardized periapical film quantitatively.
Cho, Wan Jin,Kim, Jun Ho,Oh, Se Heang,Nam, Hyun Hee,Kim, Jin Man,Lee, Jin Ho Wiley Subscription Services, Inc., A Wiley Company 2009 Journal of biomedical materials research. Part A Vol.a91 No.2
<P>A novel guided bone regeneration (GBR) membrane was fabricated by an immersion precipitation of poly (glycolic-co-lactic acid) (PLGA)/Pluronic F127 solution impregnated in an electrospun polycaprolactone (PCL)/Tween 80 nanofiber mesh. The prepared PCL/Tween 80 nanofiber mesh-embedded PLGA/Pluronic F127 membrane (hydrophilized PCL/PLGA hybrid membrane) had nano-size pores on the top side (which can prevent from fibrous connective tissue infiltration but allow permeation of oxygen and nutrients) and micro-size pores on the bottom side (which can improve adhesiveness with bone). From the comparisons of mechanical properties (tensile and suture pullout strengths), model nutrient (FITC-labeled bovine serum albumin) permeability, and bone regeneration behavior using a rat model (skull bone defect) of the hybrid membrane with those of PLGA/Pluronic F127 membrane (asymmetrically porous, hydrophilized PLGA membrane), PCL/Tween 80 nanofiber mesh (electrospun, hydrophilized PCL nanofiber mesh), and a commercialized GBR membrane, Bio-Gide® (collagen type I/III membrane), it was observed that the PCL/PLGA hybrid membrane seems to be highly desirable as a GBR membrane for the selective permeability caused by its unique morphology and osteoconductivity provided by several tens micro-size pores of the bottom side as well as the excellent mechanical strengths by the hybridization of porous PLGA membrane and PCL nanofiber mesh. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009</P>
방사선사진용 디지털 영상시스템의 정량적 평가에 관한 실험적 연구
조형희,김은경,Cho Heang-Hee,Kim Eun-Kyung 대한영상치의학회 1994 Imaging Science in Dentistry Vol.24 No.1
A digital imaging system using Machintosh Ⅱ ci computer, high resolution Sony XC-77 CCD camera, Quickcapture Frame Grabber Board was evaluated for quantitative analysis of standardized periapical film with aluminum step wedge. The results were as follows: 1. Correlation between Al thickness and gray level was high-positively associated(r²=0.99, p<0.001). 2. Correlation between measured weight of experimental lesion and estimated relative lesion volume by digital subtracted radiography was also high-positively associated (r²=0.98, p<0.001). 3. As exposure time was increased, mean gray level was decreased(p<0.01) and slope of regression line between Al thickness and gray level was also decreased (p<0.01). And when the exposure time was shorter than 0.2 second, the value of r² was relatively low. On the basis of the above results, it is considered that this digital imaging system using a Macintosh Ⅱ ci computer & a high resolution CCD monochrome camera will be useful in evaluating digitized image from standardized periapical film quantitatively.