horihorihiroki@nifty.com

The purpose of this exhibit is to summarize how to match skull density ratio (SDR), that show different value for each vender, by applying frequency filtering process. SDR is an index which shows how well ultrasound wave can pass through the skull for transcranial MR-guided focused ultrasound (TcMRgFUS) thalamotomy. Since skull with low SDR may be difficult to rise up the temperature of targeted tissue, it is one of the biggest obstacles in selecting the patients for treatment of TcMRgFUS thalamotomy. Although SDR is an important index to predict the temperature for the treatment of TcMRgFUS, it is varying not only in different venders, but also in different conditions of CT for the same patient. It is important to standardize the SDR which does not depend on each vender in TcMRgFUS thalamotomy.

Relationship between TcMRgFUS and SDR a. Thermal ablation by TcMRgFUS b. What is SDR? What is frequency filtering process a. How frequency filtering process works? b. Image change after processing SDR after frequency filtering process Future outlook