بررسی عددی رفتار شعاعی و فشار انتشاریافته از میکروحباب پوشش‌دار در مجاورت مرزهایی با الاستیسیته متفاوت در تصویربرداری فراصوت

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک دانشگاه تربیت دبیر شهید رجایی

چکیده

یکی از بهترین روش­های بهبود کیفیت و وضوح تصویربرداری فراصوتی، استفاده از حباب­های پوشش‌دار است. در این مقالهدینامیک حباب کپسوله در نزدیکی دیواره با الاستیسیته مختلف برای تصویربرداری فراصوت شبیه­سازی شده است. برای این منظور برنامه کامپیوتری در
نرم­افزار متلب توسعه داده شده که در آن معادله دیفرانسیل رایلی-پلیست اصلاح شده، به روش رانچ کاتا مرتبه چهارم حل عددی شده است. در ابتدا نتایج به‌دست‌آمده با داده­های آزمایشگاهی مقایسه شده، سپس رفتار شعاعی حباب پوشش‌دار (عوامل تقابلی فراصوتی) برای دو حالت مجاورت با دیواره صلب و الاستیک بررسی شده و فشار انتشاریافته از حباب شبیه­سازی شده است. در ادامه تأثیر میزان لزجت پوسته (Ks)، شعاع اولیه حباب و فاصله حباب تا دیواره بر رفتار دینامیکی حباب و میزان فشار انتشاریافته از آن بررسی شده است. نتایج به‌دست‌آمده به‌صورت جدول و نمودار آمده است. نتایج به‌دست‌آمده نشان می­دهد که مقدار لزجت پوسته حباب و شعاع اولیه حباب تأثیر قابل ملاحظه­ای بر دینامیک حباب دارد. درنهایت پاسخ فرکانسی حباب پوشش‌دار بررسی گردیده و نحوه تأثیر شعاع اولیه حباب، جنس پوسته و مدول کشسانی دیوار بر روی میزان قدرت طیف موج اصلی آورده شده است. نتایج به‌دست‌آمده نشان می­دهد که با افزایش مدول کشسانی دیواره، مقدار قدرت طیف موج اصلی به حالت حدی رسیده و تغییر نمی­کند.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical Investigation of the Radial Behavior and Scattered Pressure from the Encapsulated Microbubble in Vicinity of the Boundaries with Different Elasticities

نویسندگان [English]

  • Seyyed Behrooz Hosseini
  • miralam mahdi
department of mechanical engineering, shahid rajaee theacher training university
چکیده [English]

One of the best methods for improving quality and clarity of the ultrasound imaging is the use of coated bubbles. In this paper, the dynamics of an encapsulated bubble near the wall is simulated with different elasticity for the ultrasound imaging. For this purpose, a computer program has been developed in MATLAB software, in which the modified Rayleight-Plesset differential equation is solved numerically using by the fourth-order Runge Kutta method. Initially, the results were compared with experimental data, then the radial behavior of the encapsulated bubble (UCA) was investigated for two adjacent states with rigid and elastic wall and the scattered pressure from the bubble was simulated. In addition, the effect of the shell viscosity (Ks), the initial radius of the bubble and the distance between the bubble and the wall on the dynamic behavior of the bubble and the amount of scattered pressure therefrom are investigated. The results are presented in the form of table and graphs. The results show that the bubble shell's viscosity and the initial bubble radius have a significant effect on the bubble dynamics. Finally, the frequency response of the encapsulated bubble has been investigated and the effect of the initial radius of the bubble, the shell material and the elastic modulus of the wall on the strength of the fundamental spectrum has been presented. The results show that by increasing the elastic modulus of the wall, the strength of the fundamental spectrum reach the limit state and does not change.

کلیدواژه‌ها [English]

  • Ultrasound Imaging
  • Encapsulated Bubble
  • Elastic Wall
  • Radial Oscillation
  • Scattered Pressure
  • Frequency Respons

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  • تاریخ دریافت: 07 خرداد 1398
  • تاریخ بازنگری: 13 اسفند 1398
  • تاریخ پذیرش: 03 تیر 1399
  • تاریخ انتشار: 01 اسفند 1398

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