Development of laser-disk file system for the storage and analysis of analog-data acquired in physiological studies.

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The data acquired in physiological studies such as EEG, ECG, EMG, and flow-volume curves are required to be kept in each hospital at least for five years. Because these data are stored in the recording sheets and have accumulated so much, it is gettig difficult every year to find a space to store them in the hospital. This study was designed to solve this problem by the use of optic disks.Our system consists of EEG recorder, analog-to-digital converter, buffer memory (16 channels, 256 KB/channel), computer (Harris H-300 A), optic disk (DF-O 400,Toshiba), intelligent display (KEL 305B,Daikin), and hard copy machine (HA 241A,Daikin).The signals from EEG machine were digitized (100 Hz, 8 bit), stored temporarily in the buffer memory (Hotta Musen), and transferred to the optic disk which was interfaced with the computer (Harris H-300 A). The signals stored in the optic disk which included 12 channels of EEG signals, one lead of ECG signal, and machine or patient status signals were displayed on the CRT by selecting appropriate commands using a stylus pen. The time required to store or recall the whole data (records of about 30 minutes duration per patient) on or from the disk took about 20 minutes. By this system it becomes possible to store the EEG data of about 3,000 patients in one disk, and search or recall any data in the disk very fast. Since our system provides a reliable database which can be used for numerical analysis of any kinds, it will become a standard method of data storage in future.