Spiral CT: In Vitro Measurement of Stenoses

Since the introduction of continuous volume scanning within short time using spiral computed tomography (SCT), it is possible to get three-dimensional (3-D) reconstructions of the vessels without superimposed structures in all required projections [1,6]. First clinical applications of the less invasive SCT-angiography demonstrate a good morphological correlation with arterial vessel visualization [2– 5]. Also first in-vitro measurement of eccentric stenoses using SCT show a high correlation (r = 0.89–0.99) between real and measured degrees of stenosis [7]. In this study we evaluate the influence of different SCT parameters, like slice thickness, table speed and reconstruction interval on the measured degrees of stenosis.