استخراج سیگنال قلب جنین از ثبت‌های شکمی با استفاده از نمایش‌های تُنک سیگنال‌های الکتروکاردیوگرام
محورهای موضوعی : مهندسی برق و کامپیوتر
پریا طاوسی
1
(برق و کامپیوتر)
قاسم عازمی
2
(برق و کامپیوتر)
پگاه زرجام
3
(برق و کامپیوتر)
کلید واژه: آنالیز سریع مؤلفه مستقلحسگری فشردهسیگنال الکتروکاردیوگرام جنینتبدیل کسینوسی گسستهتبدیل موجک گسسته,
چکیده مقاله :
یکی از شایع‌ترین دلایل مرگ و میر در هنگام تولد نوزاد نقص قلبی است. تشخیص بیماری قلبی نیازمند مشاهده فعالیت قلب است و یکی از مطمئن‌ترین روش‌ها برای بررسی سلامت قلب، استخراج فعالیت‌های الکتریکی قلب یا استخراج الکتروکاردیوگرام است. اما در شرایط خاص مکانی جنین قبل از تولد، استخراج غیر تهاجمی سیگنال الکتروکاردیوگرام چالش‌برانگیز شده است چرا که علاوه بر قلب جنین، منابع دیگری از قبیل قلب مادر، فعالیت ماهیچه‌ای مادر و جنین، فعالیت مغزی جنین و نویزهای محیط نیز تأثیر دارند که باعث مخدوش‌شدن سیگنال قلب جنین می‌شوند و تحلیل آن را دشوار می‌کنند. سیگنال قلب مادر به دلیل دامنه زیاد بیشترین تأثیر و سیگنال مغز جنین به دلیل دامنه کم، کمترین تأثیر را در مخدوش‌شدن سیگنال قلب جنین دارند. این مقاله، روشی جدید برای استخراج الکتروکاردیوگرام جنین از ثبت‌های شکمی مادر ارائه می‌دهد. روش پیشنهادی به منظور کاهش پیچیدگی محاسباتی از روش حسگری فشرده و برای تخمین منابع از روش آنالیز سریع مؤلفه مستقل و همچنین برای نمایش تُنک سیگنال‌ها از دو دیکشنری تبدیل کسینوسی گسسته و تبدیل موجک گسسته استفاده می‌کند. عملکرد پیاده‌سازی روش پیشنهادی روی پایگاه داده موجود در چالش 2013 فیزیونت ارزیابی و نتایج به دست آمده با بهترین روش‌های موجود مقایسه شده است. نتایج به دست آمده نشان می‌دهد که روش معرفی‌شده در این مقاله، با میانگین مربعات خطای 65/171، با دقت بیشتری نسبت به سایر روش‌های موجود قادر به استخراج سیگنال‌های قلب جنین می‌باشد.
one of the most prevalent causes for mortality of infants is cardiac failure. Recordings of heart electrical activities by Electrocardiogram (ECG) are a safe method to detect abnormal arrhythmia in time and reduce cardiac failure in newborns. However, the non-invasive extraction of fetal ECG (fECG) from the maternal abdominal is quite challenging, since the fECG signals are often corrupted by some electrical noises from other sources such as: maternal heart activity, uterine contractions, and respiration, in addition to instrumental noises. Among such signals, the maternal heart signal (due to high amplitude) has the most disruptive effect and the fetal brain signal (due to low amplitude) has the least effect on distortion of the fetal heart signal. In this paper, a new method for extracting fECG signals from multichannel abdominal recordings is proposed. The proposed method uses Compressive Sensing (CS)to reduce the computational complexity and fast Independent Component Analysis (fICA) algorithm to estimate the sources. Also, for finding sparse representations of the acquired ECG signals, two dictionaries namely: discrete cosine transformation and discrete wavelet transform are deployed here. The proposed method is then implemented and its performance is tested using the well-known and publicly available database used in 2013 Physionet Challenge. The performance results are compared with that of the best performing existing methods. The results show that the proposed method based on CS and ICA outperforms the existing detection methods with a Mean Minimum Square Error (MMSE) of 171.65, and therefore can be used for non-invasive and reliable extraction fECG from abdominal recordings.
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