A METHOD FOR SELECTIVE TISSUE AND BONE VISUALIZATION USING DUAL ENERGY SCANNED PROJECTION RADIOGRAPHY
A METHOD FOR SELECTIVE TISSUE AND BONE VISUALIZATION USING DUAL ENERGY SCANNED PROJECTION RADIOGRAPHY
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DOI：
10.1118/1.594957
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发表时间：
1981-01-01
期刊：
影响因子：
3.8
通讯作者：
MACOVSKI, A
中科院分区：
文献类型：
--
作者：
BRODY, WR;BUTT, G;MACOVSKI, A
X 射线能谱中包含的信息可用于生成骨骼或软组织 [人类] 的选择性放射线图像。设计了一种方法，根据光电吸收和康普顿散射的差异，使用在 70 kVp 和 140 kVp 下射线照相曝光获得的图像的适当组合来分离骨骼和软组织。由于光电吸收高度依赖于原子序数，因此高原子序数材料（例如 Ca）可以很容易地与水密度物质分离。使用线扫描射线照相原型系统，实现了骨骼或软组织的选择性减除。由于该方法使用传统的广谱 X 射线源，因此有必要开发非线性多项式近似来估计组织和骨骼厚度。该模型通过使用水和铝的模型研究进行了验证。演示了这种双能骨和软组织分离在胸部放射成像中的应用。该方法可以准确估计组织和骨骼厚度，并且应该应用于胸部放射线照相，以改进病变检测和骨矿物质评估。
Information contained in the X-ray energy spectrum can be used to produce selective radiographic images of bone or soft tissue [human]. A method was devised to separate bone and soft tissue based upon differences in photoelectric absorption and Compton scattering using an appropriate combination of images obtained with radiographic exposures at 70 kVp and 140 kVp. Since photoelectric absorption is highly dependent upon atomic number, high atomic number materials such as Ca can be easily separated from water density substances. Using a prototype system for line-scanned radiography, selective subtraction of bone or soft tissue was implemented. Because this method uses a conventional broad-spectrum X-ray source, it was necessary to develop a nonlinear polynomial approximation to estimate tissue and bone thickness. The model was verified with phantom studies using water and aluminum. The application of this dual-energy bone and soft-tissue separation to chest radiography is demonstrated. This method allows accurate estimation of tissue and bone thickness and should find application to chest radiography for improved lesion detection and for bone mineral assessment.