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[Changes in the spatial frequency spectrum of the image as a means of diagnosing pathologic changes of the nasal
Radiologia Diagnostica
|January 1, 1989
Abstract:
A conventional radiograph can be processed by simple devices in three ways, resulting in a different spatial frequency content of the processed image. Methods of isotopic and non-isotopic high-pass filtration allow a differentiation of relevant detail. We investigated 335 patients with various disorders of the nasal sinuses and a high effectiveness of these methods was found for polypous sinusitis, cysts and malignant tumours.