Correction of background noise in direct digital dental radiography

Dento Maxillo Facial Radiology
T YoshiokaTakehito Sasaki

Abstract

To clarify the source of noise in direct digital intra-oral radiography with RVG-S (Trophy Radiologie, Vincennes, France) and to use these to develop a method for correction of background noise. Sensor temperature, image acquisition time and X-ray dose were independently analysed with the IPLab Spectrum (Signal Analytics, Vienna, VA) software. The decrease in pixel value due to the dark current was linearly related to the image acquisition time. Although a variation in sensitivity was observed when the sensor was exposed to X-rays, the mean pixel value of the entire image was linearly related to the exposure time. The image showing only the signal due to X-ray dose was derived from the original RVG-S image by correcting for the dark current and the pixel-by-pixel sensitivity variation of the CCD sensor. The image formed only by X-ray dose distribution can be derived by correcting for the background noise.

References

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Aug 1, 1993·Oral Surgery, Oral Medicine, and Oral Pathology·R Molteni
Apr 1, 1993·Oral Surgery, Oral Medicine, and Oral Pathology·U WelanderT Cederlund

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Citations

Mar 3, 1998·Dento Maxillo Facial Radiology·T YoshiokaT Sasaki
Aug 20, 2002·Journal of Endodontics·Takatomo YoshiokaTakehito Sasaki
Apr 29, 1999·Endodontics & Dental Traumatology·C L Lavelle

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