CT质量控制检测校准（采用奥利科Piranha X线多参数测试仪）

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                    <section><section powered-by="gulangu"><section><section><p><img src="image/20201019/b5390b72c425b4b954e0769c8ab21402_1.gif" /></p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section><section powered-by="gulangu"><section><section><p>CT质控项目</p></section></section></section></section></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;CT的质量项目包括均匀性、噪声水平、CT值、层厚、低对比分辨力、空间分辨力、图像间一致性、剂量等。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/d9ab14d6a106f16756cfea9df9c02c50_2.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section><section powered-by="gulangu"><section><section><p>CT质控教程</p></section></section></section></section></section></section></section><section powered-by="gulangu"><section><section><p>1、CT质控项目测试均匀性、噪声水平、CT值、层厚、低对比分辨力、空间分辨力采用相同的体模。测试前首先进行体模定位，其步骤如下。</p><p>1）体模水平定位，采用水平尺进行测量，如没有水平，可通过调节体模木箱、体模上的金属调节器调节到水平状态。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/180fa64b9db571d6c1415727ae9f703b_3.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>2）定位水平后，进行CT定位，体模上有相应的白点，该设备需要扫描四个层面，定位时注意上边和侧边的白点都需要对齐。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/ee68718f3ba6acb96d89bc3e4dc7790d_4.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/dfadc3be0e9a251521f385b9a4062e4b_5.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>3）进行体模扫描，一般条件为120KV、300mAs，层厚标称为10mm，有两种扫描方法，一种是一层一层扫描，选择轴扫方式并且只扫描一层；另一种是先扫个定位片，按制定的计划四层图像同时成像。</p><p>注：制定该计划时，首先采用尺子测量体模各层之间的距离，选择轴扫方式并且只扫描一层。</p><p>4）测量结果测算</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;层厚：</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;记录体模值CT1、背景值CT2，窗位WL=(CT1+CT2)/2，窗宽调到最小，即在（0，(CT1+CT2)/2）条件下采用测量工具测量层厚，所测的层厚再乘以0.42的结果就是该设备测得的层厚值。&nbsp; &nbsp;</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/c5c95462ea2847dacd033d562be744c2_6.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/1b80e020c5679edf042917570fd16ac9_7.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;低分辨力：</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;记录目标物最大圈的CT1值，纪录背景CT2值，计算新的窗位WL=（CT1+CT2）/2，新的窗宽WW=（CT1-CT2）+5*目标物最大圈的噪声值，即（（CT1+CT2）/2、（CT1-CT2）+5*目标物最大圈的噪声值）条件下，查看检测设备的低分辨力。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/c0e91f5593d79a5a1aa89ab98ce27760_8.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/6a8b2397aeb043ad252bdee17814f098_9.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;空间分辨力（高分辨力）</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;将WW调到最小，调节WL到线对最清晰条件下，查看设备的线对数。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/95856b83f5128334bec46b52513c5270_10.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/6719fbde08bfed5370e704c93f34a296_11.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 均匀性：</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 记录上、下、左、右、中间的CT值和SD值。计算U为边缘CT值与中间CT值的最大之差、H为（取中心测量区为模体图像直径的40%，其（SD值*100%）/1000），记录水的CT值为体模内的任意部位，空气的CT值为体模外的任意部位。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/798e4ca54bd73410f00b5973b997a895_12.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>2、CT质控项目测试剂量，其步骤如下</p><p>1）、X线多参数测试仪连接电离室适配器，电离室适配器连接电离室。</p><p>注：电离室供电为300V左右的直流高压，测试完后至少等2分钟才拔连接线。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/5ade78827c347f076713cdc0ffb5a501_13.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>2）、体模定位，把CT的激光灯定位在电离室的中间黄线上。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/c515139c59413f98f15ca3441548abbd_14.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>3）、选择条件120KV、300mAs，选择层厚10mm、轴扫一层。整个体模总共测试5个点，当电离室测试某一个点时，其他的必须采用玻璃柱填满。</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/a32af5a08dfa43648220496b95a3c5a7_15.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/fe60318811c9e6dda5ebce74a3ab65d9_16.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>4）、测量结果计算</p></section></section></section><section powered-by="gulangu"><section><section><p><img src="image/20201019/23330071e6e579b7952deb2870bfcc3f_17.jpg" /></p></section></section></section><section powered-by="gulangu"><section><section><p>注：如果采用轴扫方向下，螺距因子为1。</p><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><p>欢</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>迎</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>关</p></section></section></section></section><section><section powered-by="gulangu"><section><section><p>注</p></section></section></section></section></section></section><section powered-by="gulangu"><section><section><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section><section powered-by="gulangu"><section><section><p><img src="image/20201019/883260b55fe285d64d02a581f114d317_18.jpg" /></p></section></section></section></section><section><section powered-by="gulangu"><section><section></section></section></section></section><section><section powered-by="gulangu"><section><section><p>关注我们</p><p>一起涨姿势！</p></section></section></section></section></section></section></section>