Single-photon emission computed tomography (SPECT) is another imaging method used to scan organs. It does not need a positron-emitting isotope as used in PET, but it uses the same isotopes as conventional nuclear scans, such as gallium 67 (67Ga), thallium 201 (201Tl), and technetium 99m (99mTc).⁹ The procedure allows more sensitive and specific imaging to obtain diagnostic information because it uses a more advanced gamma camera. This camera reveals an additional third dimension of the tissue segment for viewing. Organs commonly studied by SPECT are the brain, lungs, heart, spleen, liver, and bones and joints, depending on the suspected pathology.¹⁰