Patent ID: 6263231
Filing Date: 2001-07-17
Classification: A61B,G06T,Y10S

Abstract:
A diagnostic imaging apparatus comprising:a scanning system adapted for scanning an examination subject for acqurinrg image information representing at least one region of said examination subject and which generates image signals corresponding to said image information;a signal processor, supplied with said image signals, for subjecting said image signals to spatial-frequency filtering with an adjustable bandpass characteristic to produce processed signals, said signal processor comprising at least one of the following processor means:first processor means for entering a minimum dimension of an object of said examination subject and for setting an upper limit frequency of said bandpass characteristic at a value necessary to display said object with said minimum dimension,second processor means for entering a maximum dimension of an object of said examination subject for setting a lower limit frequency of said bandpass characteristic to a value necessary for displaying an object having said maximum dimension,third processor means for calculating spectral characteristics of noise superimposed on said image signals for setting said upper limit frequency of said bandpass characteristic dependent on the calculated spectral characteristics of the noise, andfourth processor means for entering a contour of an object of said examination subject, and including a pattern recognition stage which analyzes said image signals to identify a presence of an object having a contour corresponding to the entered contour and for, given the presence of an object having a contour corresponding to the entered contour, setting the lower limit frequency of said bandpass characteristic dependent on a smallest dimension of said object having a contour corresponding to the entered contour and a largest dimension of said object having a contour corresponding to the entered contour; anda display unit supplied with said processed signals for displaying an image of said at least one region of said examination subject.