Abstract: Bone anchored hearing aid is used for hearing rehabilitation in those patients with conductive or mixed hearing loss who cannot be benefitted with a traditional air conduction hearing aid. The success of the implant depends on its osseointegration with the scalp bone which in turns depend on quality and thickness of the bone,that has to be more than 2.5 mm. Here, we suggest an innovative technique to measure bone thickness both pre- operatively and intra-operatively. High resolution computerized tomography was performed with button cell in place. Scans were reviewed to measure the bone thickness behind temporoparietal suture line .