A development of dental PACS using parallel processors with high speed communication link interfaces

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1. A direct digital dental X-ray imaging system, SENS-A-RAY^<TM> system was studied and analyzed about its basic characteristics. Images taken by SENS-A-RAY^<TM> system was inferior than that of dental films cliniccaly. Concerning those granurality. Wiener Spectrum analysis was performed. The spacial resolution of SENS-A-RAY^<TM> system was 10 lp/mm at the maximum analyzed by the test chart. The data from CCD sensor used by SENS-A-RAY^<TM> system were affected by the dark-current, and its amount was influenced by the temperature and the accumulation time. For clinical uses, the sensitivity of CCD sensor was as same as that of the E speed film.2. Bone mineral measurement of the jaw bone using SENS-A-RAY^<TM> system was attempted. This measurement was based on a 2 shot dual energy X-ray absorptiometry.3. A dental PACS was devised using parallel processors (transputers) which have four high speed serial communication ports. The serial ports equipped by the transputer can communicate at the maximum data transmission rate 1.7 Mbytes/sec. Transputer offer the true scalable performance, then the network system made with transputes was as itself scalable features. The data transmission rate 1.7 Mbytes/sec was true in this net work system, then transputer network system had much better performance than that of the ether-net system.4. A parallel disk unit was made for the purpose of increases the data transfer performance. One parallel MO disk unit was consisted of 4 units of transputer board with a SCSI interface controlling one MO disk drive.