Volumetric quantification of the vessel lumen andplaque can be derived @om a sequence of cross-sectional intracoronary ultrasound (ICUS) images. A semi-automatic approach has been developed to detect the contours of the lumen and plaque on a three-dimensional ICUS data set. This approach optimizes the contour aktection algorithm by combining information @om two perpendicular longitudinal views. Preliminary results have shown that this method is able to provide accurate and reproducible measurements of lumen and plaque volumes.

Abstract. C23H21P , monoclinic, P21/n , a = 8.573 (5), b= 17.180(5),c= 12.809(3)A, fl= 100.88(2) ° , Z = 4. Final R for 2522 observed reflexions 0.075. The average P-C distance is 1-843 (2) ,& and the average C-P-C angle 94.5 (6) °. The tert-butyl group shows rotational disorder.

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