10.5281/zenodo.1203333
Kruk Danuta
University of Warmia and Mazury, Faculty of Mathematics and Computer Science
Umut Evrim
University of Warmia and Mazury, Faculty of Mathematics and Computer Science
Elzbieta Masiewicz
University of Warmia and Mazury, Faculty of Mathematics and Computer Science
Carina Sampl
Graz University of Technology, Institute for Chemistry and Technology of Materials
Roland Fischer
Graz University of Technology, Institute for Chemistry and Technology of Materials
Stefan Spirk
Graz University of Technology, Institute for Chemistry and Technology of Materials
Christian Gösweiner
Graz University of Technology, Institute of Medical Engineering
Hermann Scharfetter
Graz University of Technology, Institute of Medical Engineering
209Bi Quadrupole Relaxation Enhancement In Solids As A Step Towards New Contrast Mechanisms In Magnetic Resonance Imaging
Zenodo
2018
2018-03-19
Preprint
https://zenodo.org/record/1203333
10.5281/zenodo.1203332
Creative Commons Attribution 4.0
Open Access
<p>Motivated by the possibility of exploiting species containing high spin quantum number<br>
nuclei (referred to as quadrupole nuclei) as novel contrast agents for Magnetic Resonance<br>
Imaging, based on Quadrupole Relaxation Enhancement (QRE) effects, 1H spin-lattice<br>
relaxation has been investigated for tris(2-methoxyphenyl)bismuthane and tris(2,6-<br>
dimethoxyphenyl)bismuthane in powder. The relaxation experiment has been performed in<br>
the magnetic field range of 0.5 T to 3 T (the upper limit corresponds to the field used in many<br>
medical scanners). A very rich QRE pattern (several frequency specific 1H spin-lattice<br>
relaxation rate maxima) has been observed for both compounds. Complementary Nuclear<br>
Quadrupole Resonance experiments have been performed in order to determine the<br>
quadrupole parameters (quadrupole coupling constant and asymmetry parameters) for 209Bi.<br>
Knowing the parameters, the QRE pattern has been explained on the basis of a quantummechanical<br>
picture of the system including single and double-quantum coherences for the<br>
participating nuclei (1H and 209Bi). In this way the quantum-mechanical origin of the spintransitions leading to the QRE effects has been explained.</p>
European Commission
10.13039/501100000780
665172
Contrast by Quadrupole Enhanced Relaxation