SPIRAL CT OF INTRACRANIAL ANEURYSMS - CORRELATION WITH DIGITAL SUBTRACTION AND MAGNETIC-RESONANCE ANGIOGRAPHY

Spiral CT and magnetic resonance angiography (MRA) were performed in t en patients with 14 intracranial aneurysms known from conventional ang iography, All lesions, the smallest 3 mm in diameter, were visible on spiral CT and MRA. The neck of the aneurysm and its anatomical relatio ns could very accurately be determined in all cases. Advantages of spi ral CT over MRA are: a short acquisition time with reduction of motion artefacts, no dependence on flow rate or cardiac output, and excellen t visualisation of calcification, thrombus and bony landmarks, Disadva ntages are the necessity for iodinated contrast medium, long postproce ssing and reconstruction time and the possibility of overlap of bone a nd venous blood.