CT dose reduction and dose management tools: Overview of available options
CT dose reduction and dose management tools: Overview of available options
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DOI：
10.1148/rg.262055138
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发表时间：
2006-03-01
期刊：
影响因子：
5.5
通讯作者：
Kofler, James M., Jr.
中科院分区：
文献类型：
--
作者：
McCollough, Cynthia H.;Bruesewitz, Michael R.;Kofler, James M., Jr.
在过去的十年中，计算机断层扫描（CT）技术和应用的巨大进步增加了CT的临床应用，引起了对电离辐射个人和人群剂量的关注。扫描仪制造商随后实施了几种选择，以适当地管理或减少CT的辐射剂量。在扫描期间调制X射线管电流是管理剂量的一种有效方法。然而，从产品名称或描述中，各种管电流调制产品之间的区别并不清楚。根据扫描仪型号，管电流可以根据患者衰减或正弦函数进行调制。调制可以是完全预编程的，通过使用反馈机制近实时地实现，或者利用预编程和反馈回路两者来实现。剂量调节可以围绕患者成角度地发生，沿着患者的长轴发生，或者两者都发生。最后，系统可以允许使用若干算法中的一种来自动调节电流以实现期望的图像质量。围绕患者的角度调制和沿沿着的调制都是最佳的，但是管电流必须适当地适应患者尺寸以实现诊断图像质量。(C)RSNA，2006年。
In the past decade, the tremendous advances in computed tomography (CT) technology and applications have increased the clinical utilization of CT, creating concerns about individual and population doses of ionizing radiation. Scanner manufacturers have subsequently implemented several options to appropriately manage or reduce the radiation dose from CT. Modulation of the x-ray tube current during scanning is one effective method of managing the dose. However, the distinctions between the various tube current modulation products are not clear from the product names or descriptions. Depending on the scanner model, the tube current may be modulated according to patient attenuation or a sinusoidal-type function. The modulation may be fully preprogrammed, implemented in near-real time by using a feedback mechanism, or achieved with both preprogramming and a feedback loop. The dose modulation may occur angularly around the patient, along the long axis of the patient, or both. Finally, the system may allow use of one of several algorithms to automatically adjust the current to achieve the desired image quality. Modulation both angularly around the patient and along the z-axis is optimal, but the tube current must be appropriately adapted to patient size for diagnostic image quality to be achieved. (C) RSNA, 2006.