Abstract

ABSTRACT Hemodynamic conditions in the carotid artery may be associated with progression of carotid artery (CA) disease and with the risk of stroke. A methodology for objective measurement of distension (D CA ) and blood-flow (Q CA ) waveform from phase-contrast (PC) magnetic resonance (MR) imaging is presented. Measurement of D CA is obtained using a modified Hough Transform (mHT) applied to the magnitude-component of the PC MR. The mHT is based on the optimization of an objective function which is the sum of the gradient magnitude of the image sampled at 10 o increments around the circle using bilinear interpolation. The mHT detects the boundary of the vessel in the cross-sectional image at 0.05-pixel resolution. Measurement of Q CA is obtained by integration of the image intensity in the phase-component of the PC MR within the circular region detected by the mHT. Keywords: Phase contrast magnetic resonance imaging, Hough Transform, Flow Quantification, Carotid Artery 1. INTRODUCTION

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