血管液态金属造影成像金属伪影校正算法研究

Metal Artifacts Correction Method Research about Liquid Metal Angiography

摘要: X射线显微CT可用于研究解剖学血管网络的可视化问题。为了突出显示血管,可向血管中注入液体金属造影剂。但是由于液体金属造影剂具有较高的线性衰减系数,会在重建图像上产生放射状的金属伪影,造成血管边界不准确。为了解决这一问题,基于骨硬化校正方法,提出了新算法。实验结果表明该方法能减轻离体猪肾血管造影成像的金属伪影,提高成像质量。

Abstract: Computed Tomography(CT) can be used in the visualization on the anatomical vessel networks. Liquid metal angiography can enhance the vessel networks. Because the liquid metal contrast agent has high linear attenuation coefficient, the reconstructed images usually have radial metal artifacts, which will cause the inaccurate edges of the vessels. To solve this problem, a new correction method based on bone beam-hardening correction is developed. The experiment results show that it can reduce the metal artifacts in isolated pig kidney liquid metal angiography image and improve the image quality.