title: A compression and transmission system of ultrasonic image sequence for telemedicine.
abstract: OBJECTIVE
  A newly developed compression and transmission system of ultrasound image sequence for telemedicine is proposed for transmitting ultrasonic image sequence in real time via IP-connected computers for telemedicine.
  
  
  METHODS
  In the compression method, the characteristics of ultrasound images were taken into account. Only sound data were essential, and the histogram of the images had two narrow distributions around black-and-white areas. The sound data, therefore, were run length encoded and then transmitted. In the transmission, UDP/IP was employed with a time weight insertion among the packets so as not to overflow the data buffers of computers in this system to derive the maximum transmission performance up to the network capacity. The decompression method was the same as the generation of the sector scan images from the sound data, so that natural ultrasound image sequence could be obtained.
  
  
  RESULTS
  This system was evaluated by transmitting the ultrasonic image sequence of the heart via ISDN (1. 5 mbps). Although this system completely specialized in compression and transmission of the ultrasound sector scan image sequence, a relatively good performance in the frame rate and the image quality was achieved, compared with the previous systems (H.260, JPEG, and MPEG-1).
authors.affiliation: Graduate School of Engineering, University of Tokyo, Tokyo, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Matani
authors.forename: H
authors.initials: H
authors.lastname: Yagi
authors.forename: T
authors.initials: T
authors.lastname: Umeda
authors.forename: K
authors.initials: K
authors.lastname: Chihara
mesh_terms: D006331:Heart Diseases / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted; D017216:Telemedicine; D014463:Ultrasonography