Spatio-temporal bandwidth-based acquisition for dynamic contrast-enhanced magnetic resonance imaging

Journal of Magnetic Resonance Imaging : JMRI
Sumati Krishnan, Thomas L Chenevert

Abstract

To develop a k-space formalism that provides a rationale for the design of variable-rate acquisition schemes for dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). The formalism, termed spatio-temporal bandwidth-based (STBB) analysis, is demonstrated using a priori modeling of object and enhancement characteristics typically observed in DCE-MRI of breast tumors. A temporally enhancing lesion is considered as a two-dimensional (2D) space-time object that possesses a corresponding spatio-temporal (k(y)-k(t)) energy spectrum. The k(y)-k(t) space is segmented based on a threshold such that the total spectral energy in a finite number of k-space samples, constrained by the imaging experiment, is maximized. This thresholded map contains a set of spatial and corresponding temporal sampling prescriptions. These prescriptions are used in designing an acquisition scheme that is adequate for a range of contrast-enhancing breast lesions. The STBB scheme is compared to an equivalent "keyhole" acquisition, in terms of quantification of enhancement rate, K(trans), extracellular volume fraction, nu(e), and spatial fidelity. We chose object sizes Npix = 2, 5, 10, 15, 20, and 30 pixels and enhancement rates K(trans) = 1.5, 1, 0.6, 0...Continue Reading

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Nov 14, 2006·Investigative Radiology·Michael F H SchockeAndreas Greiner
Sep 1, 2015·European Journal of Radiology·Ahmed E OthmanMike Notohamiprodjo
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Jan 15, 2005·Technology in Cancer Research & Treatment·M Albert ThomasNanette DeBruhl

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