technetium Tc 94m sestamibi A radioconjugate consisting of sestamibi labeled with the positron-emitting isotope Tc 94m. Sestamibi is a synthetic molecule of the isonitrile family that diffuses through cell membranes and may preferentially accumulate within mitochondria. Technetium Tc 94m sestamibi may be used in tumor-imaging studies utilizing positron emission tomography (PET). |