Iterative model reconstruction: Improved image quality of low-tube-voltage prospective ECG-gated coronary CT angiography images at 256-slice CT
Iterative model reconstruction: Improved image quality of low-tube-voltage prospective ECG-gated coronary CT angiography images at 256-slice CT
复制标题
DOI：
10.1016/j.ejrad.2014.04.027
复制
发表时间：
2014-08-01
影响因子：
3.3
通讯作者：
Weigold, Wm. Guy
中科院分区：
文献类型：
--
作者：
Oda, Seitaro;Weissman, Gaby;Weigold, Wm. Guy
目的：探讨一种新的基于模型的迭代重建(M-IR)技术--迭代模型重建技术对低管电压下前瞻性冠状动脉CT血管成像(CTA)图像质量的影响。方法：30例患者(男16例，女14例；平均年龄52.2±13.2岁)在256层CT上以100kVP进行冠状动脉CTA。使用3种类型的重建，即滤波反投影(FBP)、混合类型的迭代重建(H-IR)和M-IR来创建成对图像集。测量CT衰减、图像噪声和对比噪声比(CNR)等定量参数。视觉图像质量，即颗粒性、射束硬化、血管清晰度和整体图像质量，按5分标准进行评分。结果：3种重建方法冠状动脉CT密度差异无统计学意义。FBP、H-IR和M-IR图像的平均图像噪声分别为29.3+/-9.6、19.3+/-6.9和12.9+/-3.3HU，3种方法之间的所有比较组合均有显著差异(p<；0.01)。M-IR图像的CNR明显优于FBP和H-IR图像(13.5+/-5.0[FBP]、20.9+/-8.9[H-IR]和39.3+/-13.9[M-IR]；p<；0.01)。M-IR图像的视觉评分显著高于其他图像(P<；0.01)，M-IR图像95.3%的冠状动脉节段质量可评价，而FBP-IR和H-IR图像的质量分别为76.7%和86.9%。结论：M-IR能显著改善使用低管电压的前瞻性门控冠状动脉CTA的定性和定量图像质量。(C)2014爱思唯尔爱尔兰有限公司。保留所有权利。
Objectives: To investigate the effects of a new model-based type of iterative reconstruction (M-IR) technique, the iterative model reconstruction, on image quality of prospectively gated coronary CT angiography (CTA) acquired at low-tube-voltage.Methods: Thirty patients (16 men, 14 women; mean age 52.2 +/- 13.2 years) underwent coronary CTA at 100-kVp on a 256-slice CT. Paired image sets were created using 3 types of reconstruction, i.e. filtered back projection (FBP), a hybrid type of iterative reconstruction (H-IR), and M-IR. Quantitative parameters including CT-attenuation, image noise, and contrast-to-noise ratio (CNR) were measured. The visual image quality, i.e. graininess, beam-hardening, vessel sharpness, and overall image quality, was scored on a 5-point scale. Lastly, coronary artery segments were evaluated using a 4-point scale to investigate the assessability of each segment.Results: There was no significant difference in coronary arterial CT attenuation among the 3 reconstruction methods. The mean image noise of FBP, H-IR, and M-IR images was 29.3 +/- 9.6, 19.3 +/- 6.9, and 12.9 +/- 3.3 HU, respectively, there were significant differences for all comparison combinations among the 3 methods (p < 0.01). The CNR of M-IR was significantly better than of FBP and H-IR images (13.5 +/- 5.0 [FBP], 20.9 +/- 8.9 [H-IR] and 39.3 +/- 13.9 [M-IR]; p < 0.01). The visual scores were significantly higher for M-IR than the other images (p < 0.01), and 95.3% of the coronary segments imaged with M-IR were of assessable quality compared with 76.7% of FBP- and 86.9% of H-IR images.Conclusions: M-IR can provide significantly improved qualitative and quantitative image quality in prospectively gated coronary CTA using a low-tube-voltage. (C) 2014 Elsevier Ireland Ltd. All rights reserved.