Method for producing a noise-reduced CT image data record, computer system, and CT system农业专利-农业学术服务平台

摘要：: A method is disclosed for producing a noise-reduced CT image data record by frequency band breakdown, a computer system for carrying out the method, and a CT system (1) with such a computer system. In an embodiment of the method, several linear-combined mixed image data records(Mm=c0,m+∑i⁢ci,m·Xi) are produced from several simultaneously-recorded energy spectrum-specific CT image data records (Xi) a frequency band breakdown of the mixed image data records (Mm) takes place into a first lowest frequency band (F0) and several higher frequency bands and a result image data record(E=∑j,m⁢gj,m⁡(r)·Fj·Mm) is calculated, wherein each mixed image data record (Mm) is multiplied with precisely one filter and with a location-dependent function (gj,m(r)) and is thereby totaled, and wherein g0,0(r)=1.