CAJ | 학술논문

目的探讨如何在保证诊断用心血管CT造影（CTA）图像质量的前提下降低X射线辐射剂量的最佳方法。方法本文利用先前正常剂量扫描导引的非局部平均（ndiNLM）方法，结合先前正常剂量扫描的心血管CTA高质量图像，对当前低剂量扫描的心血管CTA图像进行恢复。结果仿真和临床心血管CTA数据实验表明，同传统非局部平均方法（NLM）相比，ndiNLM方法在抑制CTA图像噪声与伪影的同时，还可以实现心血管增强结构信息的优质保持。结论ndiNLM方法可为CTA成像中的辐射剂量降低提供有力的方法学支撑。
목적탐토여하재보증진단용심혈관CT조영（CTA）도상질량적전제하강저X사선복사제량적최가방법。방법본문이용선전정상제량소묘도인적비국부평균（ndiNLM）방법，결합선전정상제량소묘적심혈관CTA고질량도상，대당전저제량소묘적심혈관CTA도상진행회복。결과방진화림상심혈관CTA수거실험표명，동전통비국부평균방법（NLM）상비，ndiNLM방법재억제CTA도상조성여위영적동시，환가이실현심혈관증강결구신식적우질보지。결론ndiNLM방법가위CTA성상중적복사제량강저제공유력적방법학지탱。
Objective To minimize of the radiation dose of cardiovascular CT angiography (CTA) imaging while preserving the image quality. Methods To reduce the radiation dose in CTA imaging, the normal-dose scan induced non-local means (ndiNLM) algorithm was adapted for low-mAs scanned CTA image restoration by using the previous scanned high-quality image. Results Qualitative and quantitative evaluations were carried out on both simulated phantom and clinical CTA scans in terms of accuracy and resolution properties. Compared to the original NLM algorithm, the ndiNLM method could achieve noticeable gains in terms of noise-induced artifacts suppression and enhanced structure preservation. Conclusion The ndiNLM algorithm is a potential useful technique to reduce the radiation dose in CTA imaging.