Imaging of Ménière's disease after intravenous administration of single-dose gadodiamide: utility of multiplication of MR cisternography and HYDROPS image.

A HYDROPS (HYbriD of Reversed image Of Positive endolymph signal and native image of positive perilymph Signal) image, created by subtracting a positive endolymph image from a positive perilymph image after intravenous injection of single-dose gadodiamide, has been reported to facilitate recognition of endolymphatic hydrops. To further increase the contrast-to-noise ratio (CNR) of HYDROPS images, we multiplied a T2-weighted MR cisternographic image onto the HYDROPS image. Ten patients with suspected Ménière's disease were included. The average CNR of generated images increased to more than 200 times that of HYDROP images.