MO-D-213CD-01: Cartesian Methods for Rapid Time-Resolved MR Angiography

Medical Physics
Stephen J Riederer

Abstract

The physics of the MR image formation fundamentally trades off spatial resolution with temporal resolution. Time spent in acquiring data for the second image of a time series can alternatively be spent in sampling higher spatial frequencies for the first image to improve its spatial resolution. Historically this tradeoff has been addressed by making the k-space sampling rate high, such as with very short repetition times, and with methods such as view sharing in which only a portion of k-space is updated from one image to the next in a time series. Over a decade ago the method of parallel acquisition was proposed in which the signals detected by the individual elements comprising a multi-element receiver coil are used to provide further spatial discrimination and reduce acquisition time. These approaches include those based in image space (SENSE) or in k- space (SMASH, GRAPPA). In the last decade these methods have been integrated in contrast-enhanced MRA (CE-MRA) to provide a radical improvement in performance. CE-MRA is an application particularly well suited to these methods. The general desire for MRA images to be three-dimensional allows the use of 2D implementation of parallel acquisition, generally much more robust than ...Continue Reading

Related Concepts

Related Feeds

Cajal Bodies & Gems

Cajal bodies or coiled bodies are dense foci of coilin protein. Gemini of Cajal bodies, or gems, are microscopically similar to Cajal bodies. It is believed that Cajal bodies play important roles in RNA processing while gems assist the Cajal bodies. Find the latest research on Cajal bodies and gems here.

Related Papers

Journal of Magnetic Resonance Imaging : JMRI
Stephen J RiedererPhillip M Young
Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
F R KorosecCharles Mistretta
Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
Wilfried Mai
Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Clifton R HaiderStephen J Riederer
© 2022 Meta ULC. All rights reserved