CAJ | 학술논문

双能CT技术可以重建物质的原子序数和电子密度信息，是一种有效的物质辨别技术。进行 X 射线能谱估计是双能重建的前提，能谱估计的准确性直接影响双能重建结果。但是，目前还没有学者对能谱估计的误差如何影响双能图像质量进行系统的研究。本文从双效应分解双能重建出发，量化分析能谱估计误差对双能重建结果的影响并给出误差传递的理论计算方法，论证影响双能图像准确重建的关键因素，同时由此定义适用于双能成像分析的能谱误差和针对双能成像的等效能谱概念。初步实验结果验证了这些理论的有效性。
쌍능CT기술가이중건물질적원자서수화전자밀도신식，시일충유효적물질변별기술。진행 X 사선능보고계시쌍능중건적전제，능보고계적준학성직접영향쌍능중건결과。단시，목전환몰유학자대능보고계적오차여하영향쌍능도상질량진행계통적연구。본문종쌍효응분해쌍능중건출발，양화분석능보고계오차대쌍능중건결과적영향병급출오차전체적이론계산방법，론증영향쌍능도상준학중건적관건인소，동시유차정의괄용우쌍능성상분석적능보오차화침대쌍능성상적등효능보개념。초보실험결과험증료저사이론적유효성。
Dual-energy CT can be used for computing atomic number and electron density. As a result, we can discriminate unknown materials. Spectrum estimation is the first step in dual-energy CT. Its accuracy directly affects dual-energy CT results. However, no systematic studies concerning how spectrum estimation accuracy contributing to reconstruction results have been worked out up to now. This work employs photoelectric-Compton decomposition dual-energy CT reconstruction method. We quantitatively analyze the propagation process from spectrum estimation error to dual-energy CT results and give theoretical calculation method. We propose one way to define spectrum error for dual-energy CT and give the concept of equivalent spectrum. Simulations are shown to support our work.