双源双能量CT心肌灌注扫描的单能量成像对线束硬化伪影的校正研究
发布时间：2019-05-28 03:08
【摘要】：目的观察双能量CT心肌灌注成像中线束硬化伪影(beam-hardening,BH)的好发部位,比较不同单能量成像对线束硬化伪影的校正效果和图像质量。方法对84例需行心脏CT增强检查的拟诊或确诊冠心病患者进行双源双能量CT(100 k Vp/Sn 140 k Vp)心肌灌注扫描,特殊软件后处理得到心肌碘分布图和65、75、85、95、105 ke V单能量图像,以自动生成的M图像(平均加权混合120 k V)为对照,观察线束硬化伪影的发生部位和数量,根据心肌碘含量、CT值、图像背景噪声(SD)、信噪比(SNR)、对比噪声比(CNR)和图像质量评分综合评价心肌单能量成像价值。结果 65 ke V单能量图像伪影计数为274,随着能量增加,伪影计数逐渐减少(P0.05);左心室的基底段伪影最明显(36.5%,100/274),其次为间隔壁(25.91%)、上腔静脉旁段(24.82%)、后壁(12.77%)(P0.05);心肌伪影区碘含量(-2.37±0.84)mg/g低于非伪影区碘含量(3.5±0.92)mg/g(t=-19.36,P0.01);85 ke V的非伪影心肌CT值(93.52±18.52)HU与120 k V[(96.06±16.32)HU]最接近,CT值的组间差异有统计学意义(P0.01);85 ke V的SD最小(12.98±3.16,P0.01),非伪影心肌的SNR:75 ke V(6.89±1.79)与85 ke V(6.5±1.7)较高,二者无明显差别(t=1.5,P=0.14),CNR:75 ke V最高(18.79±6.76,P0.01),85 ke V(15.4±5.67)与65 ke V(15.53±4.56)之间无明显差别(t=0.27,P=0.79);图像质量评分:85 ke V最高,两名诊断医师对六组图像进行评分,结果高度一致(Kappa=0.79,P0.01)。结论左心室的基底段、间隔壁和上腔静脉旁易出现线束硬化伪影;正常心肌密度在85 ke V与混合能量120 k V最接近,85 ke V能在最有效纠正线束硬化伪影的同时保证较好的图像质量。
[Abstract]:Objective to observe the prone position of wire harness sclerosis artifact (beam-hardening,BH) in dual energy CT myocardial perfusion imaging, and to compare the correction effect and image quality of different single energy imaging on wire harness sclerosis artifact. Methods 84 patients with coronary heart disease who needed cardiac CT enhancement were examined by dual source dual energy CT (100 k Vp/Sn 140 k Vp) myocardial perfusion scan). The myocardial iodine distribution map and 65, 75, 95 105 ke V single energy images were obtained by special software post-processing. Compared with the automatically generated M image (average weighted mixed 120 k V), the location and quantity of harden artifacts were observed. according to myocardial iodine content, CT value and background noise, (SD), signal-to-noise ratio (SNR),) was observed. The value of myocardial single energy imaging was evaluated by comparing noise ratio (CNR) with image quality score. Results the artifact count of 65 ke V single energy image was 274. with the increase of energy, the artifact count decreased gradually (P 0.05). The artifacts of the basal segment of the left ventricle were the most obvious (36.5%, 100 鈮，
本文编号：2486685
[Abstract]:Objective to observe the prone position of wire harness sclerosis artifact (beam-hardening,BH) in dual energy CT myocardial perfusion imaging, and to compare the correction effect and image quality of different single energy imaging on wire harness sclerosis artifact. Methods 84 patients with coronary heart disease who needed cardiac CT enhancement were examined by dual source dual energy CT (100 k Vp/Sn 140 k Vp) myocardial perfusion scan). The myocardial iodine distribution map and 65, 75, 95 105 ke V single energy images were obtained by special software post-processing. Compared with the automatically generated M image (average weighted mixed 120 k V), the location and quantity of harden artifacts were observed. according to myocardial iodine content, CT value and background noise, (SD), signal-to-noise ratio (SNR),) was observed. The value of myocardial single energy imaging was evaluated by comparing noise ratio (CNR) with image quality score. Results the artifact count of 65 ke V single energy image was 274. with the increase of energy, the artifact count decreased gradually (P 0.05). The artifacts of the basal segment of the left ventricle were the most obvious (36.5%, 100 鈮，
本文编号：2486685
本文链接：https://www.wllwen.com/yixuelunwen/yundongyixue/2486685.html
最近更新
教材专著
