<prompt> Investigation using dye to find out stone in salivary glandSialographyMammographyMR angiographyUSG  <response>: Dye used is lipiodol or sodium diatrizoateHypaque.24-gauge cannula is passed into either Stensons duct or Whaons duct and one ml of the dye is injected into the duct and X-ray is taken. SRB,5th,406. 