探讨CT球管的合理使用

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                    <p><span style="font-size: 18px;">CT管球随着CT整机的发展而发展，由于计算机，数据采集系统（DAS）以及计算机软件的快速发展，长时间，大mA的快速扫描已成为现代螺旋CT成像的必备条件。</span></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">影响CT管球使用寿命的因素</span><span style="font-size: 18px;">主要有以下几个方面：</span></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">1．管球的安装调试</span></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">2．扫描技术条件的设定：条件主要有：KV、MA、扫描时间（管球旋转一周所需时间）、层厚、螺距（PITCH）、扫描范围、重建方式等参数。</span></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">3．管球冷却系统的工作状态</span></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">4．管球本身质量问题</span></p><p><br  /></p><p><span style="font-size: 18px;">讨论：<span style="font-size: 16px;">针对其四个因素进行如下问题的研究及探讨</span></span></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">1．对于球管的安装，应该严格按者管球技术参数的要求对灯丝电压、电流等进行调整，作好POR、BOW、ISO、GENERRETORCAL、PHANTOMCAL等校准，定期检测各项参数并即时调整。否则，不但影响管球寿命，而且影响图象质量，甚至出现伪影.</span></p><p><br  /></p><p><span style="font-size: 18px;">2．扫描参数的选择:主要从两方面考虑来进行,一方面对QA PHANGTAOM进行对比度分辨率,低对比度分辨率,噪声的扫描测试.</span></p><p><span style="font-size: 18px;">(1)实际人体各部位扫描:具体方法同以上PHANTOM的扫描方法.</span></p><p><span style="font-size: 18px;">(2)CT管球的输出与图象质量的关系:CT管球的输出是影响CT图象质量的一个重要因素,主要影响图象的低对比度分辨率和信噪比.</span></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">3.冷却系统:工作原理大部分采用:风----冷却----油----冷却----管球的方式,注意观察管球冷却系统的工作效率极为重要,最重要的工作就是定期清洁过滤网上的灰尘,使风的流速始终保持最佳状态,提高冷却效率.</span></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">4.管球本身问题(略)</span></p><p><span style="font-size: 18px;"><br  /></span></p><p><strong><span style="font-size: 20px;">结果</span></strong></p><p><span style="font-size: 18px;"><br  /></span></p><p><span style="font-size: 18px;">管球的合理使用主要体现为扫描热容量的控制,在不影响图象质量的情况下,根据PHANTOM扫描要求和实际人体扫描图象,适当减低MAS;螺旋扫描患者与轴位扫描患者搭配检查,根据不同部位调整螺距;定期检查管球供电参数及冷却系统工作状态.通过以上方法制定各台CT的工作常规要求操作人员严格执行,经过两年多的观察管球的平均使用寿命有了很大幅度的提高.</span></p><p style=""><img src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0" data-ratio="0.14784394250513347" data-w="487" width="auto" width="auto" src="http://mmbiz.qpic.cn/mmbiz/rz7R73cuHRrv6jdOCoJeZmYwvEAIoHpY0a7yJL2egiaEokLTpwkIsIRTzTFUic09aEThKHS4hrEcSqU0lAS3tu5g/0?tp=webp" style="margin: 0px; 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