THE INFLUENCE OF CHEMICAL AND DIFFUSIVE EXCHANGE ON WATER PROTON TRANSVERSE RELAXATION IN PLANT-TISSUES

被引：93

作者：

HILLS, BP

DUCE, SL

机构：

[1] AFRC Institute of Food Research, Norwich

[2] Herchel Smith Laboratory of Medicinal Chemistry, Cambridge University Clinical School, Cambridge

来源：

MAGNETIC RESONANCE IMAGING | 1990年 / 8卷 / 03期

关键词：

Biological tissue; Cells; Plant tissue; Proton NMR; Spin-spin relaxation; T[!sub]2[!/sub; Water relaxation;

D O I：

10.1016/0730-725X(90)90106-C

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Transverse water proton relaxation in parenchyma tissue of courgette, onion and apple shows a dependence on CPMG pulse spacing characteristic of each tissue. An analysis of this dependence suggests that transverse relaxation in these tissues is caused by various combinations of fast proton exchange between water and cell biopolymers (or solutes) and diffusion through internally generated magnetic field gradients. Diffusion between intra- and extracellular water compartments also averages the water proton signal to an extent that depends on cell morphology and membrane permeability and this is calculated using a two-compartment model. No recourse need be made to popular concepts such as exchange between free and "bound" water. The implications of our results for NMR image contrast are discussed. © 1990.

引用

页码：321 / 331

页数：11

共 29 条

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