The effects of using spatially selective and nonuniform radiofrequency pulses on the apparent T2 of a train of multiple echoes have been calculated by computer simulation. It is demonstrated that the use of selective pulses produces errors in estimates of T2 in imaging experiments because regions of
Nonlinear effects in paramagnetic systems and the measurement of T2
β Scribed by R. Boscaino; I. Ciccarello; C. Cusumano; M.W.P. Strandberg
- Publisher
- Elsevier Science
- Year
- 1970
- Tongue
- English
- Weight
- 119 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0375-9601
No coin nor oath required. For personal study only.
π SIMILAR VOLUMES
This study examines slice selection and diffusion as sources of systematic error in Tz estimates obtained from imaging experiments. The selective refocusing pulses in a multislice, two-echo, spin-warp experiment cause slice profiles of sequential echoes to change in shape. This results in bias in T2
## Abstract Measurements of the transverse relaxation time T~2~ are usually conducted with the Carr Purcell Meiboom Gill (CPMG) pulse sequence, which causes T~2~βweighted magnetization. Diffusion effects are a common source of error in measurements of this kind, because the incoherent motion of spi
## Abstract Paramagnetic effects on nuclear relaxation processes are described in the framework of the SolomonβBloembergen concepts. The factors contributing to nuclear relaxation, including the instantaneous electronβnuclear dipolar and contact couplings and the Curie spin effect, are described us