JOURNAL OF SHANDONG UNIVERSITY (HEALTH SCIENCES) ›› 2017, Vol. 55 ›› Issue (7): 110-114.doi: 10.6040/j.issn.1671-7554.0.2016.1358

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Evaluation and analysis of the physical factors for the twinkling artifact: a preliminary study

WANG Meng1, WANG Cheng1, ZHANG Yingchun1, LI Jie2, SUN Xiao2, SHI Dandan2, SHANG Mengmeng2, NING Song2   

  1. 1. Ultrasonic Imaging Center, the Second Affiliated Hospital of Soochow Univesity, Suzhou 215004, Jiangsu, China;
    2. Department of Ultrasound, Qilu Hospital of Shandong University, Jinan 250012, Shandong, China
  • Received:2015-12-31 Online:2017-07-10 Published:2017-07-10

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Abstract: Objective To evaluate the value of ultrasonic characteristics, the roughness of the urinary stones and machine settings in the formation of the twinkling artifact. Methods Constructing the experimental model by the sandpaper and the urinary stones respectively. In the sandpaper model part, ultrasonic output characteristics were changed by regulating the mechanical index in the IU 22 machine and the ultrasonic angle; the intensity of the twinkling artifact were compared and evaluated seperately by the correlation analysis and paired t test respectively. In the urinary stone model part, the stones were divided into the rough group, the mid-rough group and the smooth group according to the difference of the surface roughness. The display of the twinkling artifact in different groups were compared under the diverse conditions including the default and optimized settings by repeated measures ANOVA, and the correlation analysis was performed between the twinkling artifact intensity and the roughness. Results In the sandpaper model part, the intensity of the color Doppler twinkling artifact was in obvious proportion with the mechanical index(r=0.938, P<0.001). And when the Doppler angle of the color box was tilted, the number of the color pixels in the scanning 山 东 大 学 学 报 (医 学 版)55卷7期 -王蒙,等.彩色多普勒闪烁伪像相关物理因素的评估分析 \=-condition decreased significantly(P<0.05). In the urinary stone model part, there existed significant difference among different groups and obvious interaction between the urinary stone roughness and the machine settings on the twinkling artifact intensity(P<0.001). The twinkling artifact intensity was improved under the optimized machine settings compared with that of the default conditions in the urinary stones with the same roughness. However, under the same machine settings, a direct proportion relationship was found between the twinkling artifact intensity and the urinary stone roughness with the coefficient being 0.80 and 0.83 respectively(P<0.001). Conclusion Both the sandpaper phantom and urinary stone phantom showed that the formation of the twinkling artifact are affected by the ultrasonic charateristic index, the surface roughness of the urinary stones and the machine settings. Grasping the related factors on the intensity of the twinkling artifact was useful for its clinical applications.

Key words: Twinkling artifact, Model, Physical factors, Evaluation

CLC Number: 

  • R574
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