Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 321-331 |
| Number of pages | 11 |
| Journal | Magnetic Resonance Imaging |
| Volume | 8 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1990 |
Keywords
- Biological tissue
- Cells
- Plant tissue
- Proton NMR
- Spin-spin relaxation
- T
- Water relaxation
ASJC Scopus subject areas
- Biophysics
- Biomedical Engineering
- Radiology Nuclear Medicine and imaging