Nitroxide NMR contrast enhancing agents and their use in NMR imaging
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United States of America Patent
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Apr 14, 1992
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N/A
app pub date -
Feb 26, 1990
filing date -
Mar 7, 1986
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Expired
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Abstract
Nitroxides useful as NMR contrast enhancing agents for organs are of the formula ##STR1## wherein in the above formulae, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are, g., CH.sub.3 ; R is --B--COO--M.sup.+ or --B--N(alkyl).sub.3 Hal.sup.-, wherein B is a divalent bond or alkylene of 1-8 carbon atoms, M is an ammonium or metal ion and Hal is a halogen atom; are also useful as NMR contrast enhancing agents on joints.
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