1、CT安裝、調(diào)試、維修,1、CT安裝 一、安裝前準(zhǔn)備 （一）工作環(huán)境 1、溫度 早期1822% 現(xiàn)在1028 2、濕度 （Humidity) 35% 80% 3、電源 1.5MHU 50KVA 1容量 0.75MHU 30KVA 2MHU 75KVA 5MHU 100KVA 2電壓 3 380V 或 3 200V 3頻率 50HZ,4 波動 10% 5 接地 4歐姆 6 配電盤 100A 空氣開關(guān) （二）CT機房設(shè)計 房間包括：控制室、掃描室、診斷室、病人準(zhǔn)備室、 貯片室、暗室等。 重點介紹：控制室、掃描室、暗室。 1、電源 1容量 KVA 例如：日立CT-W450、W550 50KVA CT-

2、PRATICO、TURBO、PRIMA75KVA 2電源線 50mm銅線 3電壓 3 或 1 200V 或 380V 4配電盤 CT-W450、W550, 100A、600A空氣開關(guān) 其它150A空氣開關(guān)1只，離地高度1.31.4m,2、地線 130cm 7、AVR 自備還是隨機 8、進機器通道,二、安裝過程 （一）拆箱 1、清點箱數(shù) 2、逐一拆箱并記錄，有破損者，要拍照錄像 3、兩至三名工程師分工合作，對箱內(nèi)之器件逐一清點，歸位。 （二）機械部分安裝 1、GANTRY 定位 2、拆除各種固定塊 3、TUBE安裝,4、Retector安裝，加壓 5、HD安裝 6、OD安裝 7、各自歸位 （三）

3、配線 1、仔細閱讀配線布局圖 2、信號線、電源線、地線分開 3、切記不要掉螺絲，一定要緊固、正確 4、通電前要仔細檢查 5、電源線最后接,2 調(diào)試 一、外電源確認(rèn) 1、電源電壓確認(rèn) 3 200V 2、相序確認(rèn) 3、地線確認(rèn) 4、絕緣確認(rèn) 二、通電后各部分電壓確認(rèn) 1、接上電源線 2、關(guān)閉各空氣開關(guān) 3、通電 逐一合上各空氣開關(guān)，觀察有無異?，F(xiàn)象 4、各部分交、直流電壓確認(rèn),三、機械動作確認(rèn) 1、GANTRY Tile 2、GANTRY 旋轉(zhuǎn) 3、TABLE 升降 4、TABLETOP 進退 5、各面板指示是否正常 四、調(diào)試 1、TABLE CHECK (1)Vertical move of t

4、able 360+/-3m750mm+0/-3 1000mm+/-3 TCON PCB TCON PCB 5VR 6VR,(2)TABLETOP longitudinal move 10.0+/-1sec/300mm 2、GANTRY check GANTRY Tile +20deg -20deg (2)The speed check of the scanner CW 4.5S CCW4.5S 4.50-4.56S 3、adjusting the X-RAY system (1)adjustment of Tube rator starter (2)check of KV and mA wa

5、veforms (3)check of Filement vol (4)ageing the X-RAY Tube,4、adjusting the X-RAY filed (1)Fan beam position adjustment (2)Tube center adjustment Purpose: Adjusting the Tube positionalong the channel direction to makethe OFFset detector layout for increasing the ampleing date 單焦點 雙焦點 5、Vibration influ

6、ence check on image quality Vibration check Purpose:check the vibration of the detector and cables and preamplifier. strong vibration make the ring antifact on thin slice image with large patient (In this condition detector output is very low near the noise level),Check method: Evaluate the rawdate

7、as Log(XD-OFD+320) without X-ray exposure. This date is the background noise of CT system. We hope this dates variance is small. Criteria of VCK process: (1)MAX-MIN value is less than 900. (2)SD value is less than 180. SD standand Reviation (3)Max-min and SD profile have NO peak.,Check the rawdate p

8、attern (1)NO vertical and horizontal stripes appear (2)NO black and white line appear 6、compensator position adjustment Purpose :adjusting the compensator position to make the symmetrical X-ray Fan beam. Technigue:Use the rawdate sa XF-DFD date the ratie between left and right channels output is less than 5.,7、phantom cabbration Purpose: to correct the nonbnearity characteristics of each channels. Nonlinearity characteristics is caused by X-ray besm hardening effect. Effect: (1)Reduce the ring artifact. (2)Improve the CT auriber uniformity. 8、燈光調(diào)整 9、CT value adjust.,三、多層面CT技術(shù) 硬件不