Focused ultrasound thalamotomy was approved by FDA for the treatment of essential tremor under MRI guidance. However, spatial errors in the location of focal spots are often observed and could jeopardize the patient safety if not taken into account. We previously explained the causes of this error and proposed a correction method. Using the method, data associated with 121 sonications from 7 patients were statistically analyzed in the present study. Results show the focus was shifted by 0.05 mm/°C. The size of shift for treating sonication agrees with the value reported in literature.