The relaxation times T1 and nuclear Overhauser effects were measured in the 13C nuclear magnetic resonance (NMR) spectra of the diamagnetic calcium (Ca) and lanthanum (La) analogs of Gd-DTPA. From these data the correlation times for the molecular reorientation τ(R) were calculated; it is suggested that this term is the dominant one in the evaluation of the paramagnetic relaxation equation. The similar τ(R) values obtained in water and blood serum ruled out the occurrence of any adduct formation between Gd-DTPA complex and the macromolecular framework in the latter system. The difference in relaxivity shown by Gd-DTPA in the two media is interpreted in terms of influence of the serum components on the dissociation equilibrium of Gd-DTPA.
|Issue number||SUPPL. 1|
|Publication status||Published - 1988|
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging
- Radiological and Ultrasound Technology