数字化摄影DR什么意思

DR指在计算机控制下直接进行数字化X线摄影的一种新技术，即采非晶硅平板探测器把穿透人体的X线信息转化为数字信号，并由计算机重建图像及进行一系列的图像后处理。DR系统主要包括X线发生装置、直接转换平板探测器、系统控制器、影像监示器、影像处理工作站等几部分组成。

DR由于采用数字技术，因此可以根据临床需要进行各种图像后处理，如图像自动处理技术，边缘增强清晰技术、放大漫游、图像拼接、兴趣区窗宽窗位调节以及距离、面积、密度测量等丰富的功能。

扩展资料：

DR照片图像与模拟X线照片图像相比，数字图像的优势为：

数字图像的密度分辨率高。普通屏片组合X线照片的密度分辨率只能达到26灰阶，而数字图像的密度分辨率可达到210-12灰阶。虽然人眼对灰阶的分辨率有一定的限度，但固有数字图像可通过变化窗宽、窗位、转换曲线等技术，可使全部灰阶分段得到充分显示。

从而扩大了密度分辨率的信息量。扩大照片的诊断范围。如普通屏片组合X线胸部正位片的纵隔、心影后肺组织观察不清，与双膈肌重叠的肋骨也无法观察，如有骨折极易漏诊，但DR照片可以通过调节窗宽、窗位、转换曲线等技术，很清楚看到纵隔、心影后肺组织病变，与膈肌重叠的肋骨也能显示清楚等。

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广义的DR包括所有数字化的X线照相，而狭义的DR则是指直接采用电子成像板技术。电子成像板由大量微小的带有薄膜晶体管（TFT）的探测器排列而成。由于电子转换模式不同又分为间接DR板和直接DR板，前者使用碘化铯闪烁屏，将X线先转变成可见光，通过光电转化方式再被探测器接收；后者则使用非晶硒直接释放电子被探测器接收。从物理上说，直接DR板的量子转换效率应间接DR板更高。但在目前，间接DR板的稳定性好。与CR相比，DR的图像分辨率和工作效率更，X射线量更低。随着成像速度的提高，DR正在由静态向动态方向发展，将使数字化透视成为可能。但DR装置目前还很昂贵，原有的X线机必须经过大的改造和升级连接。此技术可以实现自动化检测，现场检测出结果，但就象相控阵超声波一样，需要施工车辆和设备必须到达现场，在恶劣的野外环境中这往往是最难以解决的问题，限制了DR技术的野外大量应用。数字化摄影DR是一个很常见的医疗设备，以前的CR是间接数字化摄影系统，DR是直接数字化摄影系统。从字面意思最直接的解释就是：DR摄影系统能够将穿过人体后的X射线转化成能够存储和传输的X光影片（可以想象现在照片）。

它的原理是，由X线球管产生X射线—X射线穿过人体—X射线由探测器转化成电信号—电信号传输至影像工作站，最终呈现X光影片。

NFT是什么意思?

最常见的是 无固定时间(no fixed time)或网络文件传递(network file transfer)的缩写。~ O(∩_∩)O手机nfc功能好不好。

是手机交互信息比较方便的一种功能。

nfc是near field communication缩写，即近距离无线通讯技术。由飞利浦公司和索尼公司共同开发的nfc是一种非接触式识别和互联技术，可以在移动设备、消费类电子产品、pc 和智能控件工具间进行近距离无线通信。