Abstract
Purpose : The quality of an image can be significantly improved by digital deconvolution with the (two-dimensional) point spread function (PSF) of the imaging system. We investigated the significance of this improvement for a projection radiograph of vertebral bone, using commercially available software.Methods : A magnified image of the PSF of a GE Advantx RFX system was obtained directly from a pinhole radiograph of the X-ray source and digitized. Images of vertebral bone obtained using similar technique factors were deconvolved with the PSF images, with due regard for magnification effects and using Wiener filtering to avoid amplifying the effects of noise.Results : The spatial resolution of these restored images was significantly better than the original images, and they were less noisy. A significant improvement in image quality could also be obtained by high-pass filtering using a Butterworth filter and a cut-off frequency matching that of the PSF.Conclusions : The quality of a degraded image can be significantly restored by deconvolution with the PSF as long as magnified images are obtained and digitized, and Wiener filtering is used. Alternatively, high-pass filtering can deliver some improvement and is even simpler to implement.
Published Version
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