𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Numerical Studies of Intermolecular Multiple Quantum Coherences: High-Resolution NMR in Inhomogeneous Fields and Contrast Enhancement in MRI

✍ Scribed by Sean Garrett-Roe; Warren S Warren

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
393 KB
Volume
146
Category
Article
ISSN
1090-7807

No coin nor oath required. For personal study only.

✦ Synopsis

A fast, efficient numerical algorithm is used to study intermolecular zero-quantum coherences (iZQCs) and double-quantum coherences (iDQCs) in two applications where the three-dimensional structure of the magnetization is important: high-resolution NMR in inhomogeneous fields and contrast enhancement in MRI. Simulations with up to 2 million coupled volume elements (256 ؋ 256 ؋ 32) show that iZQCs can significantly narrow linewidths in the indirectly detected dimension of systems with inhomogeneous fields and explore the effects of shape and orientation of the inhomogeneities. In addition, this study shows that MR images from iZQC and iDQC CRAZED pulse sequences contain fundamentally new contrast, and a modified CRAZED pulse sequence (modCRAZED) can isolate the contrast from chemically inequivalent spins.

📜 SIMILAR VOLUMES

High-resolution MRS in the presence of f
High-resolution MRS in the presence of field inhomogeneity via intermolecular double-quantum coherences on a 3-T whole-body scanner
✍ Yanqin Lin; Tianliang Gu; Zhong Chen; Scott Kennedy; Mathews Jacob; Jianhui Zhon 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 426 KB 👁 1 views

## Abstract Signals from intermolecular double‐quantum coherences (iDQCs) have been shown to be insensitive to macroscopic field inhomogeneities and thus enable acquisition of high‐ resolution MR spectroscopy in the presence of large inhomogeneous fields. In this paper, localized iDQC ^1^H spectros

An experimental study of decoupling sequ
An experimental study of decoupling sequences for multiple-quantum and high-resolution MAS experiments in solid-state NMR
✍ Rajendra Singh Thakur; Narayanan D. Kurur; P. K. Madhu 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 259 KB

## Abstract Recently, a sequence for heteronuclear dipolar decoupling in solid‐state NMR, namely SW~__f__~‐TPPM, was introduced by us. Under magic‐angle spinning (MAS), the decoupling efficiency of the sequence was unaffected over a range of values for various experimental parameters such as the pu