Sialoscintigraphy is a nuclear diagnostic imaging technique that assesses the major salivary gland function by using the radioactive tracer. A salivary gland scan is a nuclear medicine test that evaluates the function of the salivary glands. Salivary gland scans can help evaluate patients with persistent symptoms of a dry mouth. It can also evaluate salivary gland swelling due to either infection, inflammation, or obstruction.