Development of the new cerebral angio-CT technique and magnetic resonance angio-imaging

Using dynamic scanning, multiple cerebral computed angiotomography scans were obtained after a single bolus injection of contrast medium. The following three different techniques and their clinical applications were investigated. 1) Overlapping scanning was applied to detect unruptured intracranial aneurysms. 2) Sequential scanning was mainly applied for larger lesions such as isodense chronic subdural hematomas. 3) Two-step contrast-enhanced scanning was useful for investigating the relationship between tumor and surrounding vessels. Cerebral magnetic resonance angio-imaging was recently investigated as a noninvasive procedure using spin-echo magnetic resonance imaging.