小知识：DR检测中的测距误差

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                    <p><br  /></p><p><br  /></p><section><section powered-by="gulangu"><section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><table width="677"><tbody><tr powered-by="gulangu" opera-tn-ra-comp="_$.pages:0.layers:0.comps:0.col1:1.classicTable1:0"><td width="75%" rowspan="1" colspan="1" opera-tn-ra-cell="_$.pages:0.layers:0.comps:0.col1:1.classicTable1:0.td@@0"><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section powered-by="gulangu"><section><p>DR</p></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><br  /></section></section></section></section><section powered-by="gulangu"><section><p><strong>日常使用小妙招</strong></p></section></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/2a2d51375bfaedfed797a85066ce4cbd_1.jpg" /></p></section></section></td><td width="10%" rowspan="1" colspan="1" opera-tn-ra-cell="_$.pages:0.layers:0.comps:0.col1:1.classicTable1:0.td@@1"><section powered-by="gulangu"><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"><text x="-10" y="-10">_</text></svg></section></section><section powered-by="gulangu"><section><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></section><section powered-by="gulangu"><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></td><td width="15.01%" rowspan="1" colspan="1" opera-tn-ra-cell="_$.pages:0.layers:0.comps:0.col1:1.classicTable1:0.td@@2"><section powered-by="gulangu"><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"><text x="-10" y="-10">_</text></svg></section></section><section powered-by="gulangu"><section><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section><section powered-by="gulangu"><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section><section powered-by="gulangu"><section><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></section></section></section><section powered-by="gulangu"><p><br  /></p><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></td></tr></tbody></table></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><p>测距误差是为了衡量DR系统软件测距功能的准确性。</p><p>一般检测方法是对10cm 的刻度铅尺进行曝光，然后软件测量铅尺，对比测量结果和实际长度，计算误差。</p></section><section powered-by="gulangu"><section><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section><section><section powered-by="gulangu"><section><section powered-by="gulangu"><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/aa72eaa5cad2f81d2e5bd9014663f168_2.jpg" /></p></section></section></section><section><section powered-by="gulangu"><section><p><span>图示是DR曝光时射线路径的示意图。</span><span>我们可以看到，正常曝光时，被照射物体和探测器之间有一定的距离，这样就导致实际探测器接收到的图像是被照射物体的放大投影。对于不同的SID（射线源与影像接收器的距离）这种放大比例也不一样。</span></p><p><br  /></p></section></section></section><section><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/f5c2942768ff75e192b917067a66649d_3.png" /></p></section></section></section><section><section powered-by="gulangu"><section><p><img src="image/20201019/f5c2942768ff75e192b917067a66649d_3.png" /></p></section></section></section><section><section powered-by="gulangu"><section><p><img src="image/20201019/f5c2942768ff75e192b917067a66649d_3.png" /></p></section></section></section></section></section></section></section></section></section></section><section><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></section><section powered-by="gulangu"><p><strong>飞利浦DR中为了保证测距的准确性，测量前要先进行</strong><span><strong><span>测距校准</span></strong></span>。否则测量值是不准确的。操作方法如下，详细步骤信息可以参考随机附带的操作手册。</p></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section><section><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></section><section><p><br  /></p></section><section><section><section><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 1 1"></svg></section></section></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><p><br  /></p></section></section><section><section powered-by="gulangu"><p><strong>操作方法</strong></p></section></section><section><section powered-by="gulangu"><p><br  /></p></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><br  /></section></section><section powered-by="gulangu"><section><p><strong>测距校准</strong></p></section></section><section powered-by="gulangu"><section><br  /></section></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/177d754b0e801bc378591dd834c4e7f3_6.jpg" /></p></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/da41bf9a97ca52de49a71ead9c84dd3c_7.jpg" /></p></section></section></section><section><section powered-by="gulangu"><section><p><strong>?选择缩放工具</strong></p></section></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/f7988102af64891bf4948fc3dab17417_8.jpg" /></p></section></section></section><section><section powered-by="gulangu"><p><strong>?选择“pixel to pixel”（像素到</strong><strong>像素）显示。这可以获得更精确的校准值。</strong></p></section></section></section><section powered-by="gulangu"><section><section powered-by="gulangu"><section><p><img src="image/20201019/6fda1d7970c48cc0c2fb94df4aa51c2c_9.jpg" /></p></section></section></section><section><section powered-by="gulangu"><section><p><strong>?选择校准工具。</strong></p><p><strong>→视窗中出现一条线段</strong></p></section></section></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/ba5c79187a3f71296537258fc8a29624_10.jpg" /></p></section></section><section powered-by="gulangu"><section><p><strong>该线段具有设置的值，例如340mm。该值按下图所示的方式显示：</strong></p></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/3570e27c9dee17497e5b3e8d7276913e_11.jpg" /></p></section></section><section powered-by="gulangu"><section><p><strong>您可以借助蓝色端点移动、旋转和更改这条线段的长度。例如：</strong></p></section></section><section powered-by="gulangu"><section><p><img src="image/20201019/42ea001d3298e4ad3c8329c391790469_12.jpg" /></p></section></section><section powered-by="gulangu"><section><p><strong>?将线段放在校准物体上</strong></p><p><strong>?输入校准物体的实际尺寸（单位mm）并按Enter，</strong><strong>将会执行新的校准。</strong></p></section></section><section powered-by="gulangu"><p><br  /></p></section></section></section></section><section powered-by="gulangu"><p><br  /></p></section><section powered-by="gulangu"><p><br  /></p></section></section></section></section><p><br  /></p><p>转自：飞利浦服务与解决方案</p><p><br  /></p><p><br  /></p><p>更多详情可关注：医疗维修在线<br  /></p><p><br  /></p>