✦ LIBER ✦

Measurement of Spin-Lattice Relaxation Times in Double Spin-Echo Imaging

✍ Scribed by Max S. Lin

Publisher: John Wiley and Sons
Year: 1984
Tongue: English
Weight: 489 KB
Volume: 1
Category: Article
ISSN: 0740-3194
DOI: 10.1002/mrm.1910010307

No coin nor oath required. For personal study only.

✦ Synopsis

Calculation of tissue TI in double spin-echo imaging (90"-T-I 80"-2T-1 SO0) using two repetition times (6, and b2) has entailed an approximation that ignores the two 180" pulses. The theoretical consequence of the simplification is to overestimate TI with a fractional error that increases with increasing TI faster than linearly in a manner dependent on the sequence parameters. With b l , b2, and T as parameters, the theory gives a family of curves relating TI to the predicted ratio of signals acquired at b2 versus bl intervals. Tissue TI can be determined from the observed signal ratio with no approximation. Consideration of noise effect on the precision of TI so determined favors the use, within limits, of higher b2/bl ratio for the same bl + b2 time. At constant b2/bl, using longer b, + b2 permits wider range of TI to be measurable with a specified minimum precision.

📜 SIMILAR VOLUMES

NMR spin–lattice relaxation time measure

NMR spin–lattice relaxation time measurements in organochalcogen compounds

✍ E. W. Abel; K. G. Orrell; A. W. G. Platt 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 English ⚖ 345 KB

Errors in spin–lattice relaxation time m

Errors in spin–lattice relaxation time measurements from restricted volumes

✍ Terry Morrone 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 468 KB 👁 1 views

In vivo T1 measurements are usually made from images. In this paper we describe an alternative method in which data are collected from a strip instead of from an entire plane. We will compare the signal-to-noise ratios, the time to make a measurement, and the error in T1 as well as other aspects of

Direct measurement of spin-lattice relax

Direct measurement of spin-lattice relaxation times of Phosphorus Metabolites in Human Myocardium

✍ S. Neubauer; T. Krahe; R. Schindler; H. Hillenbrand; C. Entzeroth; M. Horn; W. R 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 452 KB 👁 1 views

## Abstract T1 values of phosphorus metabolites visible in human cardiac ^31^P‐MR spectra were determined in 12 volunteers at 1.5 T. Consecutive spectra were acquired with varying pulse repetition time (TR) from 1.6 to 24 s; volume selection was achieved with ISIS. T 1's of creatine phosphate (CP),

Determination of optimal angles for vari

Determination of optimal angles for variable nutation proton magnetic spin-lattice, T1, and spin-spin, T2, relaxation times measurement

✍ Sean C.L. Deoni; Terry M. Peters; Brian K. Rutt 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 204 KB 👁 1 views

## Abstract __T__~1~ and __T__~2~ can be rapidly determined with a combination of multiangle spoiled gradient recalled echo (SPGR) and steady‐state free precession (SSFP) imaging. Previously, we demonstrated a simple method for determining the set of SPGR and SSFP angles that provided greater __T__

Magnetic field dependence of proton spin

Magnetic field dependence of proton spin-lattice relaxation times

✍ Jean-Pierre Korb; Robert G. Bryant 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 105 KB 👁 1 views

The magnetic field dependence of the water-proton spin-lattice relaxation rate (1/T(1)) in tissues results from magnetic coupling to the protons of the rotationally immobilized components of the tissue. As a consequence, the magnetic field dependence of the water-proton (1/T(1)) is a scaled report o

Spin–Lattice Relaxation Times of H2and D

Spin–Lattice Relaxation Times of H2and D2in Aqueous Solutions

✍ Haggai Gilboa; Bogdan E. Chapman; Philip W. Kuchel 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 100 KB