𝔖 Bobbio Scriptorium
✦   LIBER   ✦

An analysis of fast imaging sequences with steady-state transverse magnetization refocusing

✍ Scribed by Yuval Zur; Saul Stokar; Peter Bendel

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
764 KB
Volume
6
Category
Article
ISSN
0740-3194

No coin nor oath required. For personal study only.

✦ Synopsis

Recently, several groups have proposed and demonstrated the use of rapid imaging methods, using short pulse repetition times and gradient-reversal echoes. Here, we analyze the behavior of the magnetization and the resulting image contrasts in such sequences for the case where the pulse repetition time TR is of the order of, or shorter than, the transverse relaxation time T2, and the transverse magnetization is not destroyed between phase-encoding cycles. Exact analytical expressions describing the signal evolution between the pulses are derived, taking into account the effects of resonance offsets and flip angles, and examining the influence of constant-phase or alternate-phase RF pulse trains. It is shown that for typical imaging sequences two distinct echo signals will develop between pulses, which may have a detrimental effect on image quality if they partially overlap within the sampling window. It is shown that artifact-free images can be obtained only if the two echo signals overlap precisely, which seems technically close to impossible to achieve, or if they are sufficiently separated in time to allow sampling of only one of the signals.

📜 SIMILAR VOLUMES

Non-contrast-enhanced MR portography wit
Non-contrast-enhanced MR portography with time-spatial labeling inversion pulses: Comparison of imaging with three-dimensional half-fourier fast spin-echo and true steady-state free-precession sequences
✍ Kotaro Shimada; Hiroyoshi Isoda; Tomohisa Okada; Toshikazu Kamae; Shigeki Arizon 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 482 KB

## Abstract ## Purpose To compare and evaluate images acquired with two different MR angiography (MRA) sequences, three‐dimensional (3D) half‐Fourier fast spin‐echo (FSE) and 3D true steady‐state free‐precession (SSFP) combined with two time‐spatial labeling inversion pulses (T‐SLIPs), for selecti

Measurement of deep gray matter perfusio
Measurement of deep gray matter perfusion using a segmented true–fast imaging with steady-state precession (True-FISP) arterial spin-labeling (ASL) method at 3T
✍ Elan J. Grossman; Ke Zhang; Jing An; Abram Voorhees; Matilda Inglese; Yulin Ge; 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 829 KB

## Abstract ## Purpose To study the feasibility of using the MRI technique of segmented true–fast imaging with steady‐state precession arterial spin‐labeling (True‐FISP ASL) for the noninvasive measurement and quantification of local perfusion in cerebral deep gray matter at 3T. ## Materials and

Advanced morphological 3D magnetic reson
Advanced morphological 3D magnetic resonance observation of cartilage repair tissue (MOCART) scoring using a new isotropic 3D proton-density, turbo spin echo sequence with variable flip angle distribution (PD-SPACE) compared to an isotropic 3D steady-state free precession sequence (True-FISP) and standard 2D sequences
✍ Goetz H. Welsch; Lukas Zak; Tallal C. Mamisch; Dominik Paul; Lars Lauer; Andreas 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 286 KB

## Abstract ## Purpose To evaluate a new isotropic 3D proton‐density, turbo‐spin‐echo sequence with variable flip‐angle distribution (PD‐SPACE) sequence compared to an isotropic 3D true‐fast‐imaging with steady‐state‐precession (True‐FISP) sequence and 2D standard MR sequences with regard to the n