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

1. 对直接数字化口腔x线成像系统SENS-A-RAY^<TM>系统的基本特性进行了研究和分析。SENS-A-RAY^<TM>系统在临床上的成像效果不如牙膜。关于那些颗粒性。进行维纳光谱分析。通过测试图分析，SENS-A-RAY^<TM>系统的空间分辨率最高为10 lp/mm。SENS-A-RAY^<TM>系统的CCD传感器数据受暗电流影响，暗电流的大小受温度和积累时间的影响。临床上使用时，CCD传感器的灵敏度与E速片相同。尝试使用SENS-A-RAY^<TM>系统测量颌骨骨矿物质。该测量是基于2次双能x射线吸收计。采用具有4个高速串行通信端口的并行处理器（转换器）设计了一种牙科PACS。上位机配备的串行端口最大数据传输率为1.7 mb /s。transpute提供了真正的可扩展性能，那么由transpute构成的网络系统本身就具有可扩展的特性。该网络系统的数据传输速率为1.7兆字节/秒，因此传输网络系统的性能要比以太网系统好得多。为了提高数据传输性能，设计了一个并行磁盘单元。一个并行MO磁盘单元由4个带有SCSI接口控制一个MO磁盘驱动器的计算机板单元组成。

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.