Ghrelin analogues

A ghrelin analogue comprising a peptide comprising a sequence ranging from at least amino acid residues 1-7 of SEQ ID NO:

• 1 to a sequence of up to amino acid residues 1-28 of SEQ ID NO:
• 1 and an imaging agent, wherein said imaging agent is attached to the peptide at the amino acid residue at position 3 of SEQ ID NO:
• 1 via a linker which consists of an amide linkage and 4 to 12 methylene or an aromatic entity selected from the group consisting of phenyl, biphenyl, naphthyl and cyclopentyldienyl, and wherein the imaging agent and linker replace the n-octanoyl group of SEQ ID NO:
• 1 and the ghrelin analogue retains receptor-binding activity.