Abstract
To evaluate the performance of three digital devices regarding the noise added to digital radiographic images containing different optical densities.Methods:A radiographic image was digitized repeatedly ten times using two scanners (HP 4c/T and HP 5370C) and a digital camera (Nikon 990). A histogram tool measured a mean pixel value and the standard deviation of the region of interest in each image. Both values were used to calculate the image noise at the different optical densities.Results:The noise values found were different for all devices and optical densities. There was a statistically significant difference (p<0.05) between the scanner HP 4c/T and the digital camera regarding the noise values. There was a significant correlation (p<0.05) between the noise values found for the HP 4c/T scanner and the digital camera and between both scanners (p<0.01).Conclusions:The noise added to the image was higher for scanner HP 4c/T and less for the digital camera. The noise was higher at the lower optical densities for the scanners. It seems that depending on the equipment and the optical density, a variable amount of noise can be incorporated to the images.
Highlights
IntroductionDigital devices such as film digitizers or digital cameras are commonly found in Radiology departments and are used to create digital image files from conventional (analog) radiographic films[5,12]
Unitermos: Imagem digital; Imagem radiográfica; Escaner; Câmera digital; Dispositivo de carga acoplada; Ruído. Digital devices such as film digitizers or digital cameras are commonly found in Radiology departments and are used to create digital image files from conventional radiographic films[5,12]
The present study was based on the hypothesis that using a calculation based on mean and standard deviation pixel values, it is possible to evaluate the noise of digital equipment used for radiographic image capture
Summary
Digital devices such as film digitizers or digital cameras are commonly found in Radiology departments and are used to create digital image files from conventional (analog) radiographic films[5,12]. Emerging technologies such as picture archive and communication systems have become more widespread so that film digitizers will continue to find applications until direct digital x-ray capture technology completely replaces film-based radiology[7,8,9]. The present study was based on the hypothesis that using a calculation based on mean and standard deviation pixel values, it is possible to evaluate the noise of digital equipment used for radiographic image capture. Three digital devices were tested regarding the noise added to the image
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