✦ LIBER ✦

RF Pulse Concatenation for Spatially Selective Inversion

✍ Scribed by Klaas P Pruessmann; Xavier Golay; Matthias Stuber; Markus B Scheidegger; Peter Boesiger

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 153 KB
Volume: 146
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.2000.2107

No coin nor oath required. For personal study only.

✦ Synopsis

It is shown that spatially selective inversion and saturation can be achieved by concatenation of RF pulses with lower flip angles.

A concatenation rule which enables global doubling of the flip angle of any given excitation pulse applied to initial z magnetization is proposed. In this fashion, the selectivity of the single pulse is preserved, making the high selectivity achievable in the low flip-angle regime available for inversion and large flip-angle saturation purposes. The profile quality achievable with exemplary concatenated pulses is investigated in comparison with adiabatic inversion. It is verified that by using concatenated inversion in the transfer insensitive labeling technique (TILT), the MT artifact is suppressed.

📜 SIMILAR VOLUMES

An adjustable adiabatic pulse for select

An adjustable adiabatic pulse for selective population inversion

✍ Lorenz Mitschang 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 292 KB

## Abstract A new adiabatic inversion pulse and its design principles are presented. An analytical expression in the pulse length, inversion bandwidth, inversion efficiency, peak RF amplitude, and width of the transition region is derived and validated. Accordingly, the pulse shape can be adapted t

Dualband spectral-spatial RF pulses for

Dualband spectral-spatial RF pulses for prostate MR spectroscopic imaging

✍ Amir A. Schricker; John M. Pauly; John Kurhanewicz; Mark G. Swanson; Daniel B. V 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 324 KB

## Abstract Although MR spectroscopic imaging (MRSI) of the prostate has demonstrated clinical utility for the staging and monitoring of cancer extent, current acquisition methods are often inadequate in several aspects. Conventional 180° pulses can suffer from chemical shift misregistration, and 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

B1 inhomogeneity effect reduction for 2D

B1 inhomogeneity effect reduction for 2D spatial selective RF pulse using simulated annealing

✍ Yong Pang; Gary X. Shen 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 383 KB

## Abstract With the development of the high‐field MRI system, the RF field inhomogeneity becomes a challenging problem in high flip angle excitation. In this study, a new RF pulse design method is proposed, which combines the simulated annealing (SA) algorithm and the __k__‐space method to attain

Design of symmetric-sweep spectral-spati

Design of symmetric-sweep spectral-spatial RF pulses for spectral editing

✍ Charles H. Cunningham; Daniel B. Vigneron; Albert P. Chen; Duan Xu; Ralph E. Hur 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 421 KB

Spectral-spatial RF (SSRF) pulses allow simultaneous selection in both frequency and spatial domains. These pulses are particularly important for clinical and research MR spectroscopy (MRS) applications for suppression of large water and lipid resonances. Also, the high bandwidth of the subpulses (5

Shaped Pulses for Selective Inversion in

Shaped Pulses for Selective Inversion in Solid-State Deuteron NMR Spectroscopy

✍ Marco J. Brown; Gina L. Hoatson; Robert L. Vold 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 350 KB

This paper discusses the implementation and optimization bined to improve the performance of selective pulses in solidof selective-inversion pulses for deuteron powder patterns. state deuteron NMR. Efficient off-resonance selective inversion of While the theory appears analogous to liquid-state sele