title: [Changes in the spatial frequency spectrum of the image as a means of diagnosing pathologic changes of the nasal sinuses].
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.
authors.forename: A L
authors.initials: AL
authors.lastname: Kossovoi
mesh_terms: D000328:Adult; D000368:Aged; D006801:Humans; D008875:Middle Aged; D010254:Paranasal Sinus Diseases / Q000000981:diagnostic imaging*; D010255:Paranasal Sinus Neoplasms / Q000000981:diagnostic imaging*; D011856:Radiographic Image Enhancement / Q000379:methods*
vernacular_title: Anderung des Ortsfrequenzspektrums der Abbildung als Verfahren zur Diagnostik von pathologischen Veränderungen der Nebenhöhlen.