摘要:
The invention relates to an improved method of dynamic nuclear polarisation (DNP) of carboxylic acids and to compounds and compositions for use in the method.
摘要:
The invention relates to an improved method of dynamic nuclear polarisation (DNP) of carboxylic acids and to compounds and compositions for use in the method.
摘要:
The invention relates to a method of dynamic nuclear polarisation (DNP) using a combination of a trityl radical and a paramagnetic metal ion as the polarising agent leading to enhanced levels of polarisation in the sample to be polarised and to compositions and polarising agents for use in the method.
摘要:
The invention relates to a method of dynamic nuclear polarisation (DNP) using a combination of a trityl radical and a paramagnetic metal ion as the polarising agent leading to enhanced levels of polarisation in the sample to be polarised and to compositions and polarising agents for use in the method.
摘要:
The present invention relates to a method of generating an electron spin resonance enhanced magnetic resonance image of a sample which comprises introducing into the sample a magnetic resonance signal enhancing amount of a free radical and generating an enhanced electron spin resonance image of the sample. The method comprises using as the free radical an inert triarylmethyl free radical, wherein each aryl moiety of said triarylmethyl radical, which may be identical or different, comprises an optionally substituted 6-membered carbocyclic or thienyl ring. The invention also relates to the use of trityls in ESR imaging.
摘要:
The present invention relates to certain novel triaryl methyl free radicals and their use as image enhancing agents in magnetic resonance imaging (MRI) as well as to contrast media containing such radicals and to the use of such radicals and their non-radical precursors in the manufacture of MRI contrast media.
摘要:
The invention provides novel persistent free radicals useful in Overhauser MRI being triarylmethyl radicals having as at least one aryl group a group of formula ##STR1## (wherein each X which may be the same or different is an oxygen or sulphur atom or a group CO or S(O).sub.n, (where n is 1 to 3) with the proviso that at least one group X is a sulphur atom or a S(O).sub.n group; R.sup.1 is a hydrogen atom or group of formula --M, --XM, --X--Ar.sup.2, or --Ar.sup.2 where M is a water solubilizing group, and Ar.sup.2 represents a 5-10 membered aromatic ring optionally substituted by a water solubilizing group M; and each of the groups R.sup.7, which may be the same or different, is a hydrogen atom, or a hydrocarbon group or a water solubilizing group M, or two groups R.sup.7 together with the atom to which they are bound represent a carbonyl group or a 5 to 8 membered cycloalkylidene, mono- or di-oxacycloalkylidene, mono- or di-azacycloalkylidene or mono- or di-thiacycloalkylidene group optionally with the ring attachment carbon replaced by a silicon atom, and R.sup.7 where it is other than hydrogen, is optionally substituted by a hydroxyl group, an optionally alkoxylated, optionally hydroxylated acyloxy or alkyl group or a water solubilizing group M)). The novel radicals have good stability, long relaxation times and good relaxivity.