256CT低管电压联合迭代重组技术在头颈部CT血管成像中的应用

发布时间：2019-01-04 23:01

【摘要】：目的探讨低管电压(80 k V)联合迭代重组技术在头颈部CT血管成像(CTA)扫描中对图像质量、辐射剂量的影响。方法将75例临床需要行头颈部CTA检查的患者随机编入A、B、C三组,每组25例。A组为常规剂量扫描,参数为120 k V、300 m As,经滤波反投影(FBP)重组;B、C组为低剂量扫描,管电流和管电压分别为120k V、180 m As,80 k V、180 m As,采用i Dose4迭代重组。对比分析CT图像质量,包括动脉强化值、对比噪声比(CNR)、图像质量评分及辐射剂量。计量资料采用配对t检验两两比较,图像质量评分采用非参数χ2检验进行统计分析。结果 (1)图像质量主观评分:A组3分1例,4分24例;B组3分2例,4分23例;C组3分5例,4分20例;统计学分析无差异(P㧐0.05)。(2)A、B两组主动脉弓、颈总动脉、颈内动脉及大脑中动脉的动脉强化CT值统计无明显差异(P㧐0.05);C组的CT动脉强化值高于A组(P0.05)。(3)C组的背景噪声[(12.5±1.9)HU]高于A组[(9.0±1.6)HU](P0.05);两组的CNR分别为(49.2±9.4)、(43.0±12.6),无统计学差异(P㧐0.05)。(4)A、B、C组的剂量长度乘积(DLP)分别为(925.1±48.5)、(571.4±24.2)、(164.1±7.0)m Gy·cm;辐射有效剂量(ED)分别为(2.87±0.15)、(1.77±0.08)、(0.51±0.02)m Sv,均有统计学意义(P0.05),C组较A组辐射剂量明显降低,约82.3%。结论 256 CT头颈部CTA采用低管电压(80 k V)联合迭代重组技术能提供满足临床诊断要求的图像,同时明显降低辐射剂量。
[Abstract]:Objective to investigate the effect of low tube voltage (80 k V) combined with iterative recombination) on image quality and radiation dose in CT angiography (CTA) scanning of head and neck. Methods Seventy-five patients with head and neck CTA were randomly assigned to group C (25 cases in each group). Group A was scanned with conventional dose and the parameters were 120kV / 300m As, reconstructed by filtered backprojection (FBP). The current and voltage of the tube were 120kV ~ (180 m) As,80 / k V ~ (180) m As, respectively. I Dose4 was used to iterate the recombination of the current and the voltage of the tube. The image quality of CT, including arterial enhancement value, contrast noise ratio (CNR),) image quality score and radiation dose, were compared and analyzed. The measurement data were compared by paired t test and the image quality score was statistically analyzed by non-parametric 蠂 2 test. Results (1) subjective score of image quality: group A (1 case, 4 points 24 cases), group B (3 points 2 cases, 4 points 23 cases), group C (3 points 5 cases, 4 points 20 cases), group B (2 cases, 4 points 23 cases), group C (3 points, 5 cases, 4 points 20 cases); There was no significant difference in CT value of aortic arch, common carotid artery, internal carotid artery and middle cerebral artery between two groups (P0. 05). (2). The CT arterial enhancement value in group C was higher than that in group A (P0.05). (3) [(12.5 卤1.9) HU] and higher than that in group A [(9.0 卤1.6) HU] (P0.05). The CNR of the two groups was (49.2 卤9.4), () 43.0 卤12.6, and the dose length product (DLP) was (925.1 卤48.5), () 571.4 卤24.2.There was no significant difference between the two groups (P0. 05). (4). (164.1 卤7.0) m Gy cm;) The effective dose of radiation (ED) was (2.87 卤0.15), () 1.77 卤0.08), (0.51 卤0.02) m Sv,). (P0.05) the radiation dose of), C group was significantly lower than that of group A (about 82.3) m Sv,). Conclusion the low tube voltage (80 k V) combined with iterative recombination technique for 256 CT head and neck CTA can provide images that meet the requirements of clinical diagnosis and reduce the radiation dose significantly at the same time.
【作者单位】：东莞市人民医院放射科;
【分类号】：R816.2

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