摘要
目的:探讨CT能谱成像最佳对比噪声比(Optimal CNR)技术对胃周动脉CT成像图像质量的影响。方法:对临床怀疑胃癌的20例患者采用能谱扫描模式行双期增强扫描,利用Optimal CNR技术获得显示胃周动脉的最佳单能量图像。采用add vessel及薄层最大密度投影(TSMIP)技术分别对混合能量(140kVp)及最佳单能量图像的胃周动脉进行重建,分别计算并比较两组图像的腹腔干对比噪声比、图像噪声,并对重建后的图像质量进行评分。结果:显示胃周动脉的最佳单能量为(51±2)keV;最佳单能量组腹腔干对比噪声比(分别为33.93、19.57)、图像质量评分(分别为12.43±2.58、8.90±2.50)分别较混合能量组增加约71%、40%,图像噪声(分别为17.55±4.76、12.48±3.61)增加约41%。结论:能谱成像最佳对比噪声比技术可提高胃周动脉CT成像的图像质量。
Objective： To explore the effect of optimal contrast-to noise ratio （Optimal CNR） technique of spectral im- aging on the image quality of gastric arterial CT angiography （CTA）. Methods： 20 patients with clinically suspected gastric cancer underwent dual-phase enhanced gemstone spectral imaging （GSI） examination. GSI viewer was used to obtain the op- timal CNR monochromatic images. Both the polychromatic （140kVp） and the monochromatic image sets were post-pro cessed with add vessel and thin slice maximum intensity projection （TSMIP） technique. The CNR,image noise of celiac trunk were calculated respectively and the image quality after reconstruction were scored, the results were compared and an- alyzed. Results：The monochromatic images at （51 ± 2）keV were found to provide the best CNR for gastric arterial CTA. Compared with those of the polychromatic images, the CNR of the celiac trunk, image noise and the scores of the image quality of the optimal CNR monochromatic images increased by 71%.41% and 40% respectively. Conclusion：The optimal CNR technique of spectral imaging can improve image quality of gastric arterial CTA.
出处
《放射学实践》
2013年第1期51-54,共4页
Radiologic Practice
