Medical image-Ultrasonic image patent map

Ultrasonic and X-ray images are two major tools for medical device. Since ultrasonic image doesn´t need contrast agent and radiation source. So it has advantage for the basic medical treatment and standard medical procedure. Many papers discussed the patent analysis techniques, but seldom use patent classification alone or combine with keywords and patent classification. So far, there is no academic paper and report that used CPC for patent data analysis. This study, we combined keywords and CPC to evaluate the future trend for the ultrasonic image medical device.