✦ LIBER ✦

Angiographic Imaging with 2D RF Pulses

✍ Scribed by Marcus T. Alley; John M. Pauly; F. Graham Sommer; Norbert J. Pelc

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 951 KB
Volume: 37
Category: Article
ISSN: 0740-3194
DOI: 10.1002/mrm.1910370220

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Magnetic resonance angiography (MRA) was performed by using RF pulses designed to excite a limited spatial extent in two orthogonal directions. The restriction in the second spatial dimension can be used to increase inflow enhancement and to improve small field‐of‐view imaging. A rectangular excitation was produced with an “echo‐planar” k‐space trajectory and a sine‐modulated RF waveform. In vivo images have demonstrated that vessels are more clearly delineated with the two‐dimensional excitation. Aliasing artifacts in small field‐of‐view imaging are significantly reduced, although in some cases complete elimination is not possible due to the nature of the gradient trajectory.

📜 SIMILAR VOLUMES

Chemical shift imaging with phase-encodi

Chemical shift imaging with phase-encoding RF pulses

✍ J. Hennig 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 530 KB

## Abstract An inherent problem of conventional chemical shift imaging is signal contamination into adjacent voxels. This is especially severe in proton spectroscopy of the central nervous system, where the lipid signal from the skull is several orders of magnitude higher than the metabolite resona

Simultaneous multislice imaging with sli

Simultaneous multislice imaging with slice-multiplexed RF pulses

✍ K.J. Lee; J.M. Wild; P.D. Griffiths; M.N.J. Paley 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 687 KB

## Abstract A method for simultaneous multislice imaging is presented that uses a multislice RF pulse that imparts a different linear phase profile to each slice. During readout, slices are unaliased by using extra slice‐select gradient lobes, which rephase and dephase individual slices one at a ti

Perfusion imaging using FOCI RF pulses

✍ Martin N. Yongbi; Craig A. Branch; Joseph A. Helpern 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 634 KB

## Abstract Pulsed arterial spin‐tagging techniques for perfusion measurements (e.g., echo planar MR imaging and signal targeting with alternating radiofrequency (EPISTAR), flow‐sensitive alternating inversion recovery (FAIR), quantitative imaging of perfusion using a single subtraction (QUIPPS), u

Calibration of echo-planar 2D-selective

Calibration of echo-planar 2D-selective RF excitation pulses

✍ Markus Oelhafen; Klaas P. Pruessmann; Sebastian Kozerke; Peter Boesiger 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 954 KB

## Abstract Echo‐planar radiofrequency (RF) pulses (EPP) are increasingly being used for 2D‐selective excitation in MRI. Pulse schemes of this kind are susceptible to eddy‐current effects, timing imperfections, and anisotropy of the gradient system. As a consequence, practical EPP implementations h

Multifrequency selective rf pulses for m

Multifrequency selective rf pulses for multislice MR imaging

✍ S. Müller 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 452 KB

A method is described for multislice imaging by means of rf pulses which contain a multifrequency excitation spectrum. These pulses label each slice by an individual signal phase and allow the separation of the signals from all the slices by subsequent add/subtract procedures. The image sensitivity

SSFP signal with finite RF pulses

✍ Oliver Bieri; Klaus Scheffler 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 762 KB

## Abstract The theoretical description of steady state free precession (SSFP) sequences is generally well accepted and unquestioned, although it is based on instantaneously acting radiofrequency (RF) pulses. In practice, however, all excitation processes are finite, thereby questioning the overall