Department of Stomatology, Bauru School of Dentistry-University of São Paulo Bauru, São Paulo, Brazil.
Dentomaxillofac Radiol. 2011 Sep;40(6):338-43. doi: 10.1259/dmfr/67185962.
The aim of this study was to evaluate the performances of observers in diagnosing proximal caries in digital images obtained from digital bitewing radiographs using two scanners and four digital cameras in Joint Photographic Experts Group (JPEG) and tagged image file format (TIFF) files, and comparing them with the original conventional radiographs.
In total, 56 extracted teeth were radiographed with Kodak Insight film (Eastman Kodak, Rochester, NY) in a Kaycor Yoshida X-ray device (Kaycor X-707; Yoshida Dental Manufacturing Co., Tokyo, Japan) operating at 70 kV and 7 mA with an exposure time of 0.40 s. The radiographs were obtained and scanned by CanonScan D646U (Canon USA Inc., Newport News, VA) and Genius ColorPage HR7X (KYE Systems Corp. America, Doral, FL) scanners, and by Canon Powershot G2 (Canon USA Inc.), Canon RebelXT (Canon USA Inc.), Nikon Coolpix 8700 (Nikon Inc., Melville, NY), and Nikon D70s (Nikon Inc.) digital cameras in JPEG and TIFF formats. Three observers evaluated the images. The teeth were then observed under the microscope in polarized light for the verification of the presence and depth of the carious lesions.
The probability of no diagnosis ranged from 1.34% (Insight film) to 52.83% (CanonScan/JPEG). The sensitivity ranged from 0.24 (Canon RebelXT/JPEG) to 0.53 (Insight film), the specificity ranged from 0.93 (Nikon Coolpix/JPEG, Canon Powershot/TIFF, Canon RebelXT/JPEG and TIFF) to 0.97 (CanonScan/TIFF and JPEG) and the accuracy ranged from 0.82 (Canon RebelXT/JPEG) to 0.91 (CanonScan/JPEG).
The carious lesion diagnosis did not change in either of the file formats (JPEG and TIFF) in which the images were saved for any of the equipment used. Only the CanonScan scanner did not have adequate performance in radiography digitalization for caries diagnosis and it is not recommended for this purpose.
本研究旨在评估观察者在使用两种扫描仪和四种数码相机以联合图像专家组（JPEG）和标记图像文件格式（TIFF）文件从数字咬合片获得的数字图像中诊断近中龋的性能，并将其与原始常规射线照片进行比较。
共对 56 颗离体牙进行了放射检查，使用柯达 Insight 胶片（Eastman Kodak，Rochester，NY）在 Kaycor Yoshida X 射线设备（Kaycor X-707；Yoshida Dental Manufacturing Co.，Tokyo，Japan）上进行，管电压为 70kV，管电流为 7mA，曝光时间为 0.40s。使用 CanonScan D646U（佳能美国公司，Newport News，VA）和 Genius ColorPage HR7X（KYE Systems Corp. America，Doral，FL）扫描仪以及佳能 PowerShot G2（佳能美国公司）、佳能 RebelXT（佳能美国公司）、尼康 Coolpix 8700（尼康公司，Melville，NY）和尼康 D70s（尼康公司）数码相机以 JPEG 和 TIFF 格式获取和扫描图像。三位观察者对图像进行了评估。然后在偏光显微镜下观察牙齿，以验证龋病病变的存在和深度。
无诊断的概率范围为 1.34%（Insight 胶片）至 52.83%（CanonScan/JPEG）。灵敏度范围为 0.24（佳能 RebelXT/JPEG）至 0.53（Insight 胶片），特异性范围为 0.93（尼康 Coolpix/JPEG、佳能 PowerShot/TIFF、佳能 RebelXT/JPEG 和 TIFF）至 0.97（CanonScan/TIFF 和 JPEG），准确性范围为 0.82（佳能 RebelXT/JPEG）至 0.91（CanonScan/JPEG）。
在用于数字化射线照相的任何设备中，以 JPEG 和 TIFF 格式保存图像都不会改变龋病病变的诊断。只有 CanonScan 扫描仪在龋病诊断的数字化射线照相方面性能不佳，不建议用于此目的。
