The invention relates to a method for using Ultrasonic B image data to obtain dissect M-type image, and relative device. Wherein, said device comprises main controller, detector, wave combiner, checker, data buffer, and the image processing display module formed by MDSC module, interpolation module, M image buffer, BDSC module and B image buffer. The main controller controls the detector to emit and receive ultrasonic wave via inter-row scanning method, to obtain at least one group of continuous M-type data at time from one frame of B-type data with high spatial resolution; the MDSC module extracts data from scanning line buffer to be transformed into grid point data of dissect M-type; said grid point via interpolation module can improve its time resolution to meet the demand of dissect M-type image display. The invention can obtain higher dissect M-type frame rate without changing B image frame rate, to realize dissect M-type image on low-level Ultrasonic B machine. |