Phase-contrast magnetic-resonance angiography (PC MRA) generates images of vascular structures as three-dimensional maps of the blood-flow velocity in a volume of interest. To improve visualization methods for PC MRA, radiologists can benefit from image-processing algorithms that can classify flow and stationary tissue. In this paper, I describe a vector-difference distribution (VDD): a statist...

BACKGROUND A detailed contrast bolus propagation model is essential for optimizing bolus-chasing Computed Tomography Angiography (CTA). Bolus characteristics were studied using bolus-timing datasets from Magnetic Resonance Angiography (MRA) for adaptive controller design and validation. METHODS MRA bolus-timing datasets of the aorta in thirty patients were analyzed by a program developed with...

An MR angiographic method is presented in which a rotating 2D slice is centered on and targets a region or vessel of interest. Collecting a series of slices rotating about the center of the targeted region yields projection data sufficient for the calculation of 3D volumetric data of the region using conventional backprojection reconstruction techniques. These volumetric data depict the interna...

Visualization of blood vessels for diagnostic and therapeutical purposes is one of the standard procedures in radiological practice. In conventional angiography, a contrast agent is injected into a patient’s artery or vein, and its distribution is shown on two-dimensional X-ray projections. This method is well-suited for the investigation of a wide variety of disorders, but problems such as X-r...