论文部分内容阅读
1.故障现象 轴向头部扫描时,屏幕显示图像全无,但文字信息如时间、姓名等显示正确,未报任何错码。2.分析 径DAS采集的数据,一方面以原始数据的形式存于硬盘,一方面经FPU进行反投影处理,以图像方式显示于屏幕。通过SUPPORT莱单查看原始数据未见异常,再通过POST RECON莱单对故障前数据进行重建,故障如前。说明故障出在图像重建上。 MAX图像重建由FPU子系统来完成。FPU共有五块板,用测试软件逐一测试,全部顺利通过,检查电压,排线接头及作除尘处理仍未奏效。至此,基本排除
1. Symptom When the axial head scans, nothing is displayed on the screen, but the text information such as time, name, etc. is displayed correctly and no error code is reported. 2. Analyze Data collected by DAS, on the one hand, is stored on the hard disk in the form of raw data. On the other hand, it is back-projected by the FPU and displayed on the screen as an image. There is no abnormality in viewing the original data through SUPPORT. Then POST RECON is used to reconstruct the pre-fault data. The fault is as before. Explain that the fault is on image reconstruction. MAX image reconstruction is done by the FPU subsystem. The FPU has a total of five boards, which are tested one-by-one with the test software and all passed smoothly. Checking the voltage, connecting the cable connectors and performing the dust-removal processing have still not worked. At this point, basic exclusion