نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشجوی دکتری، فیزیک پزشکی، دانشکده علوم پزشکی، دانشگاه تربیت مدرس، تهران

2 استاد، فیزیک پزشکی، دانشکده علوم پزشکی، دانشگاه تربیت مدرس، تهران

3 پزشک، فوق متخصص قلب و عروق بیمارستان دی ، تهران

چکیده

با توجه به حساسیت بازده عملکرد سیستولیک بطن چپ به زاویه‌ی چرخش قلب، در این مطالعه زاویه سه بعدی مسیر حرکت سه بعدی عضله میوکارد با استفاده همزمان از تصاویر دو بعدی از نمای محور کوتاه و نمای محور طولی دیواره بطن چپ برآورد شد. تصاویر متوالی اکوکاردیوگرافی دو بعدی با حداقل رزلوشن زمانی 14 میلی ثانیه از دو نمای محور کوتاه و طولی 19 مرد سالم ثبت و آنالیز شد. با استفاده از سیگنال الکتروکاردیوگرام هر فرد، تصاویر اکوکاردیوگرافی در دو نمای ثبت شده، همزمان شدند. حرکت دیواره سپتوم بین بطنی در سه سطح بیس، مید و اپکس توسط الگوریتم تطبیق بلوک با پردازش تصاویر متوالی اکوکاردیوگرافی در طول سه سیکل قلبی و از دو نمای ثبت شده برآورد شد. بستگی زوایای دوران برآورد شده از دو نمای محور طولی و محور کوتاه با زاویه‌ی سه بعدی مسیر حرکت در سطوح بیس، مید و اپکس بررسی گردید. زاویه مسیر حرکت سه بعدی قلب و زوایا‌ی دو بعدی دوران در دو نمای محور کوتاه و طولی دیواره سپتوم بین بطنی به ترتیب در سگمان بیس 01/3±33/16، 38/3±61/10 و 30/3±11/15 درجه، در سگمان مید 95/4±77/22، 96/2±78/7 و 66/2±72/16 درجه و در سگمان اپکس 81/5±60/14، 48/5±37/10 و 32/3±79/8 درجه برآورد شد. با توجه به حساسیت زاویه‌ی سه بعدی به تغییرات حرکت در هر سه بعد، این زاویه برای بررسی رفتار بیومکانیکی عضله میوکارد پیشنهاد می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Estimation of Myocardial Torsion Angle by Tracking Sequential Images of Echocardiography

نویسندگان [English]

  • Mosayeb Mobasheri 1
  • Manije Mokhtari Dizaji 2
  • Faride Roshanali 3

1 Medical Physics Department, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran

2 Medical Physics Department, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran

3 Department of Cardiology, Day General Hospital, Tehran, Iran

چکیده [English]

Heart torsion is one of  the biomechanical parameters that are sensitive to changes in both regional and global left ventricular (LV) function. In this study, angle of myocardium’s trajectory in three dimensions (Ф) was estimated by simultaneous use of two dimensional long apical and short axis views of LV septum sequential images. Then correlation of 3D angle and 2D rotation angle from long (χ) and short (θ)  axis views respectively was estimated and compared at three levels of base, mid and apex of interventricular septum wall. Sequential two dimensional echocardiography images of long and short axis views with minimum temporal resolution 14 ms of 19 healthy men was recorded and analyzed. Interventricular septum wall motion at three levels of base, mid and apex were estimated using sequential images processing of echocardiography in long and short axis views with block matching algorithm throughout three cardiac cycles. Then correlation of 2D angle of rotation from long (χ) and short (θ) axis views was analyzed with three dimentional angular of myocardium’s trajectory (Ф) at three levels of base, mid and apex of interventricular septum wall. Ф, θ and χ angles at base level 16.33±3.01, 10.61±3.38 and 15.11±3.30 degrees, mid level 22.77±4.95, 7.78±2.96 and 16.72±2.66 degrees and apex level of interventricular septum wall 14.60±5.81, 10.37±5.48 and 8.79±3.32 degrees were extracted respectively. Regard to sensitivity of 3D angle to variation of motion in each of three dimensions, it is suggested for examination of biomechanical behavior myocardium in different pathologic conditions.

کلیدواژه‌ها [English]

  • 3D angle
  • myocardium
  • Block matching algorithm
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