| abstract |
A method if shown for obtaining improved digital radiological images during a digital subtraction angiography (DSA) intervention, carried out by the introduction of a contrast medium consisting of CO2 or other fluid in an examination zone (Z) of a human or animal body, and the creation of digital radiological images (IMC1, IMC2, IMC3 IMCn) of the examination zone (Z) at the time of contrast medium input. A mask image (IMM1, IMM2, IMM3 IMMn) of the same zone (Z) is subtracted from each image (IMC1, IMC2, IMC3 IMCn) with contrast medium and thus produce a series of “clean” digital radiological images (IMP1, IMP2, IMP3 IMPn) with limited noise. According to the method, each mask image (IMM1, IMM2, IMM3 IMMn) consists of the image with contrast (IMC (2-1), IMC (3-1) IMC (n-1)) immediately preceding the image with contrast currently obtained or by weighted combination thereof. |