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下肢动脉病变能谱CT血管成像图像后处理中最佳单能量图像的选择
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- Author:
- No author available
- Journal Title:
- Chinese Journal of Radiology
- Issue:
- 3
- DOI:
- 10.3760/cma.j.issn.1005-1201.2013.03.017
- Key Word:
- No keyword available
Abstract： 随着我国老龄化进程的加快和糖尿病发病率的上升,下肢动脉病变(peripheral arterial disease,PAD)的发病率日趋升高,约12％的老年人罹患此病[1].MSCT已经成为PAD筛查和诊断的主要方法[2].图像后处理始终是MSCTA的重要环节,而提高下肢动脉CTA图像质量的关键是增加下肢动脉与伴行静脉的对比度[3].虽然增加对比剂的剂量和注射速率可提高下肢动脉的对比度,但同时,应用混合能量的传统X线CT会增加硬化伪影[4-5].双能量(能谱)MSCT的问世有望解决此类问题,因其不但产生物质分离图像,还提供40 ～ 140 keV的单能量图像,使血管内碘的衰减随着光子能量的减少而增加,使得利用最佳对比噪声比(contrast noise ratio,CNR)优化图像质量成为可能[6].笔者通过对比不同keV的单能量图像,旨在利用最佳CNR挑选出一个最佳的单能量图像序列,报道如下.
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