Bacha Raham, Gilani Syed Amir, Manzoor Iqra
Department of University Institute of Radiological Sciences and Medical Imaging Technologies (UIRSMIT), Faculty of Allied Health Sciences (FAHS), University of Lahore, Pakistan.
Gilani Ultrasound Center, Afro-Asian Institute, Lahore, Pakistan.
J Med Ultrasound. 2019 Jan-Mar;27(1):13-18. doi: 10.4103/JMU.JMU_129_18. Epub 2019 Feb 4.
The aim of this study is to determine the effect of scale/pulse repetition frequency (PRF) on the appearance of color Doppler twinkling artifact.
We commenced this cross-sectional study for 20 months from November 2014 to July 2016. During routine ultrasound examination, we observed multiple case of twinkling artifact produced by renal stones, calcifications in the thyroid nodules, bony fragments and intestinal gases, etc., We observed twinkling artifact with low- and high-PRF settings in 500 different structures. A total of 500 other structures were included wherein there was no Doppler twinkling artifact produced by them, with usual optimum PRF settings. These structures were also evaluated with low- and high-PRF to determine the effect of PRF on twinkling artifact effectively. All the patients were examined according to the AIUM guideline for appropriate examination protocol. Data were collected from the observation of twinkling artifact with low- and high-PRF/scale and evaluated with the help of IBM SPSS 24 package, the results were summarized as follow.
Change in scale/PRF could not affect the twinkling artifact. The twinkling artifact observed with low-PRF was the same as seen with high-PRF. There was a significant agreement between low- and high-PRF in the production of color twinkling artifact. The kappa value of agreement was estimated as 0.96, whereas the Pearson's correlation was significant with the value of 0.001. Same twinkling artifact was created with low- and high-PRF, with no significant variation.
Twinkling artifact is independent of PRF/Scale.
本研究旨在确定深度/脉冲重复频率（PRF）对彩色多普勒闪烁伪像表现的影响。
我们于2014年11月至2016年7月开展了这项为期20个月的横断面研究。在常规超声检查期间，我们观察了由肾结石、甲状腺结节钙化、骨碎片和肠道气体等产生的多例闪烁伪像。我们在500个不同结构中观察了低PRF和高PRF设置下的闪烁伪像。另外纳入了500个在常规最佳PRF设置下未产生多普勒闪烁伪像的结构。这些结构也采用低PRF和高PRF进行评估，以有效确定PRF对闪烁伪像的影响。所有患者均按照美国医学超声学会（AIUM）的适当检查方案指南进行检查。收集低PRF和高PRF/深度下闪烁伪像的观察数据，并借助IBM SPSS 24软件包进行评估，结果总结如下。
深度/PRF的变化不会影响闪烁伪像。低PRF下观察到的闪烁伪像与高PRF下所见相同。在彩色闪烁伪像的产生方面，低PRF和高PRF之间存在显著一致性。一致性的kappa值估计为0.96，而Pearson相关性显著，值为0.001。低PRF和高PRF产生的闪烁伪像相同，无显著差异。
闪烁伪像与PRF/深度无关。
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