Patent ID: 8303936

Claim:
A method for imaging a subject, wherein the subject is administered a compound of the following formula: wherein Cat + is a cation; X and Y are each (CH 3 ) 2 C; and R 8 and R 13 are each independently alkyl, (CH 2 ) r R 25 or (CH 2 ) r R 18 ; wherein at least one of R 8 and R 13 is (CH 2 ) r R 18 and wherein r is an integer from 1 to 50, and R 25 is a member selected from the group consisting of hydroxyl, thioacetyl, and sulfonato and R 18 is carboxyl; R 11 and R 12 are each independently H, sulfonato, or together with the atoms to which they are bonded form an aromatic ring; and R 16 and R 17 are each independently H, sulfonato, or together with the atoms to which they are bonded form an aromatic ring, wherein the image is of a tumor, tissue or organ of the subject.