Radiology Department, Haga Teaching Hospital/Juliana Children's Hospital, Leyweg 275, 2545 CH, Den Haag, The Netherlands,
Insights Imaging. 2013 Oct;4(5):723-7. doi: 10.1007/s13244-013-0281-5. Epub 2013 Aug 28.
In digital radiography we are now able to electronically collimate images after acquisition. This may seem convenient in paediatric imaging, but we have to be aware that electronic collimation has two major downsides. Electronic collimation implicates that the original field size should have been smaller and the child has been exposed to unnecessary radiation. Also, by use of electronic collimation, potentially important information may be lost. The "silver lining", denoting the X-ray beam collimation, can serve as a useful radiation protection instrument to check for proper field size and detect unnecessary exposure. Furthermore, the silver lining confirms all exposed anatomy is shown in the final image, and thus may also serve as a quality assurance instrument as the patient has the right to all acquired information. Teaching Points • The ability to electronically collimate an image after acquisition may serve to enhance contrast in the region of interest. • The ability to electronically collimate an image after acquisition carries the risk of overexposure. • The ability to electronically collimate an image after acquisition carries the risk of losing important information. • The silver lining can serve as a quality control instrument for proper collimation. • The patient has the right to all information obtained during an X-ray examination.
在数字放射摄影中，我们现在能够在采集后对图像进行电子准直。这在儿科成像中似乎很方便，但我们必须意识到电子准直有两个主要缺点。电子准直意味着原始射野应该更小，儿童已经受到了不必要的辐射。此外，通过使用电子准直，可能会丢失重要信息。“银线”表示 X 射线束准直，可以作为一种有用的辐射防护工具，用于检查适当的射野大小和检测不必要的曝光。此外，银线确认最终图像中显示了所有暴露的解剖结构，因此也可以作为质量保证工具，因为患者有权获得所有获得的信息。教学要点
采集后对图像进行电子准直的能力可以增强感兴趣区域的对比度。
采集后对图像进行电子准直的能力存在过度曝光的风险。
采集后对图像进行电子准直的能力存在丢失重要信息的风险。
银线可以作为准直的质量控制工具。
患者有权获得 X 射线检查过程中获得的所有信息。
