𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A spoiling sequence for suppression of residual transverse magnetization

✍ Scribed by Henry Z. Wang; Stephen J. Riederer

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
971 KB
Volume
15
Category
Article
ISSN
0740-3194

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

We present a spoiler sequence which substantially eliminates residual transverse magnetization in rapid magnetic resonance imaging. Such magnetization is due to the repetition time TR being on the order of or shorter than the transverse relaxation time T2. This sequence was designed using computer simulation methods to model the slice profile and signal. The spoiler pulse is applied in the slice‐selecting direction and the magnitude of the gradient spoiler is incremented with each repetition as an arithmetic series. A finite number of different spoiler amplitudes is repeated with a cycle time several times greater than the anticipated T2. Each spoiler is shown to nullify the residual transverse magnetization from the just‐measured signal of the experiment as well as that from preceding repetitions. It is shown experimentally that the spoiler pulse can be as short as 2 ms. This is considerably shorter than existing methods using constant spoiling or phase‐tagged spoiling. This sequence was used to acquire. T1‐weighted images free of the central line artifact of FLASH imaging. Furthermore, images formed with the new spoiled technique are shown to have contrast‐to‐noise comparable if not superior to standard T 1‐weighted spin‐echo images while taking only a fifth of the scan time. © 1990 Academic Press, Inc.

📜 SIMILAR VOLUMES

Spoiling of transverse magnetization in
Spoiling of transverse magnetization in steady-state sequences
✍ Y. Zur; M. L. Wood; L. J. Neuringer 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 757 KB

## Abstract A detailed analysis is presented of a method to eliminate transverse magnetization prior to each rf excitation in pulse sequences with TR < __T__~2~. It is shown that artifact‐free images with high __T__~1~ contrast can be obtained only if a phase shift that is incremented during each T

Enhanced Suppression of Residual Water i
Enhanced Suppression of Residual Water in a “270” WET Sequence
✍ Shanmin Zhang; Xianbin Yang; David G Gorenstein 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 80 KB

In certain water suppression experiments, the residual water, which comes from a region away from the center of the RF coil and experiences a much smaller flip angle than the designed one, may appear. The residual water in the WET sequence can be reduced significantly by using a composite 90(x)( deg

A magnetization-driven gradient echo pul
A magnetization-driven gradient echo pulse sequence for the study of myocardial perfusion
✍ Robert M. Judd; Scott B. Reeder; Ergin Atalar; Elliot R. Mcveigh; Elias A. Zerho 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 890 KB

## Abstract A __T__~1~‐weighted imaging pulse sequence for contrast‐based studies of myocardial perfusion is presented and evaluated in phantoms and __in vivo.__ The sequence is similar to spoiled gradient‐recalled echo equences except that nonselective preparatory RF pulses drive magnetization to

Assessment of aorto-iliac disease with m
Assessment of aorto-iliac disease with magnetic resonance angiography using arterial phase 3-d gradient-echo and interstitial phase 2-d fat-suppressed spoiled gradient-echo sequences
✍ Shambhavi Venkataraman; Richard C. Semelka; Susan Weeks; Larissa Braga; Georgeta 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 968 KB

## Abstract ## Purpose To evaluate magnetic resonance angiography (MRA) of the pelvis for the examination of the aorto‐iliac system using arterial phase 3‐D gradient echo and interstitial phase 2‐D fat‐suppressed spoiled gradient‐echo (SGE), with comparison to surgery and angiography. ## Material

Trajectory planning for residual vibrati
Trajectory planning for residual vibration suppression of a two-link rigid-flexible manipulator considering large deformation
✍ Akira Abe 📂 Article 📅 2009 🏛 Elsevier Science 🌐 English ⚖ 707 KB

In this paper an optimal trajectory planning technique for suppressing residual vibrations in two-link rigid-flexible manipulators is proposed. In order to obtain an accurate mathematical model, the flexible link is modeled by taking the axial displacement and nonlinear curvature arising from large