医学CT的误差修正方法、图像重建及实现

医学Ｘ光ＣＴ作为一种诊断设备，对其图像质量要求很高，而在实际应用中各种误差都将会影响最终的图像质量，因而对误差进行修正是非常重要的，这一点在各厂家的ＣＴ 产品中表现得尤为突出。通过研究对医学Ｘ光ＣＴ 的探测器、Ｘ光射束硬化效应等所产生的误差进行修正，给出了在ＰＣ机上对误差进行修正和图像重建的方法和步骤，完成了对分辨率水模、对比度水模、病人头部和肺部的图像重建，证明该方法行之有效。

Method and Implementation of Error Correction and Image Reconstruction for Medical CT

Medical X ray CT as diagnostic equipment requires a more strict image quality. The image quality is degraded by various sources of error in practice. So the error correction method is very important in almost all kinds of CT equipment. Having explored the error correction method of the X ray detectors, and X ray beam hardening for medical X ray CT, the whole error correction and image reconstruction computer realizing procedure in PC is given. This method is applied to perform the image reconstruction of resolution water phantom,contrast water phantom,patient head and patient lung. The high quality images have verified the effectiveness of the method.