Rudin S, Bednarek D R
Department of Radiology, State University of New York, School of Medicine and Biomedical Sciences, Buffalo 14215.
Med Phys. 1992 Sep-Oct;19(5):1183-9. doi: 10.1118/1.596792.
In some medical imaging applications, it is necessary to visualize only the center of the field of view with optimal quality. For example, often in interventional radiographic procedures only the region directly adjacent to the catheter tip must be well seen. A new imaging approach which reduces the number of photons exposing the patient outside a region of interest (ROI), while allowing the photon fluence to be maintained or increased in the ROI, may make more optimal use of the total integral radiation dose to the patient as well as enable increased contrast and reduced artifacts in the ROI. A demonstration is given with an angiographic phantom, for an ROI which is less than 10% of the total field of view and where the periphery receives 6% of the ROI exposure. Contrast is improved about 30% in the ROI, and yet the images are adequate in the periphery for visualizing high contrast reference features while there is a reduction in total integral patient dose. Details of the technique are discussed along with requirements for clinical implementation.
在一些医学成像应用中，仅以最佳质量可视化视野中心是很有必要的。例如，在介入放射学程序中，通常只有紧邻导管尖端的区域必须清晰可见。一种新的成像方法可以减少在感兴趣区域（ROI）之外照射患者的光子数量，同时允许在ROI中保持或增加光子注量，这样可能会更优化地利用给予患者的总积分辐射剂量，还能提高ROI中的对比度并减少伪影。通过一个血管造影体模进行了演示，对于一个小于总视野10%的ROI，其周边接受的辐射量为ROI照射量的6%。ROI中的对比度提高了约30%，而且周边的图像足以可视化高对比度参考特征，同时患者的总积分剂量有所降低。文中讨论了该技术的细节以及临床实施的要求。
