Ga68 PET/CT scans are superior to In-111-pentetreotide scans in detecting neuroendocrine tumors. Imaging relies on the density of somatostatin receptors on neuroendocrine tumors. Tumors that can be visualized by Ga68 PET scan include neuroendocrine tumors (NET), medullary thyroid carcinoma, pheochromocytoma, small cell lung cancer, neuroblastoma, paraganglioma, and others. There is no need for special preparations such as fasting. If you are on somatostatin analog therapy (long or short acting) please consult your physician, as they should be stopped before the exam. Imaging starts 50 minutes after the injection, the length of the scan is about 20 minutes.