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Study of H eart D isease and Analysis of PPD Algorithm

Study of H eart D isease and Analysis of PPD Algorithm. m5151117 Yumiko Kimezawa. Outline. Previous Work Modification to Methods Current PPD Algorithm My Opinion Future Work. Previous Work. Studying how to actually capture an ECG signal from people

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Study of H eart D isease and Analysis of PPD Algorithm

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  1. RPS Study of Heart Disease and Analysis of PPD Algorithm m5151117 Yumiko Kimezawa

  2. Outline RPS • Previous Work • Modification to Methods • Current PPD Algorithm • My Opinion • Future Work

  3. Previous Work RPS • Studying how to actually capture an ECG signal from people • An A/D converter included in our daughterboard is unfit for capturing the ECG signal • An input amplifier will be required because the ECG signal is very weak

  4. Modification to Methods RPS • Capturing an ECG signal from people actually • We use sample data from database as input data • Capturing an ECG signal from people actually • Hard • Taking long time Modification • Studying only

  5. Current PPD Algorithm RPS • This algorithm seems to process only ECG signals includetypical peaks (P, Q, R, S, T and U) • This algorithm can not processirregular heart rhythm such as ventricular fibrillation (Vf)

  6. Ventricular Fibrillation (VF) RPS • Extremely dangerous situation • Deadly arrhythmia • Irregular rhythm • P wave is not found • QRS waves are wide-ranging • Severe decrease in blood pressure and no feeling a pulse ventricle

  7. Processing Results of VF RPS On the ventricular fibrillation wave, P waves don’t appear and QRS waves are wide-ranging PPD algorithm must have detected peaks incorrectly

  8. My Opinion RPS • Someone’s heart beats hundreds of thousands of times per day (100,000 times/day) • In addition to extracting ECG wave form, computers have to support analysis of the wave whether heart is normal or not • Doctors only have to receive information of patients considered at risk for heart disease It is difficult for doctors to diagnose so many patients My Opinion

  9. Future Work RPS • Analysis of PPD algorithm • Optimization of PPD algorithm

  10. RPS

  11. RPS MIT:16272

  12. RPS MIT:16273

  13. RPS MIT:16273

  14. Our Architecture RPS Processing results are sent through the Ethernet Sensor A/D converter Processing Filter RAM Results From patient

  15. Important Things in Measurement of ECG Signal RPS • Clinically-important frequency component of ECG signal • - 0 ~ 250Hz Change in voltage inside this range must be faithfully reproduced • Change in voltage in chest wall • Less than 3mV (very weak) • Measurement in environments with much noise Voltage gain of high signal-to-noise ratio (250 to 1000 times) must be gained • Signal-to-noise ratio: The ratio of signal power to the noise power

  16. Book Knowledge RPS • An example of block diagram illustrating cardiography equipment Lead Code Head amplifier Isolation circuit Impedance converter Lead network Power Circuit Main amplifier Micro computer ADC Output equipment

  17. Book Knowledge RPS • An example of block diagram illustrating cardiography equipment Lead Code Head amplifier Isolation circuit Impedance converter Lead network Power Circuit • This circuit prevents body’s impedance from being lower than input circuit’s impedance Main amplifier Micro computer ADC Output equipment

  18. Book Knowledge RPS • An example of block diagram illustrating cardiography equipment Lead Code Head amplifier Isolation circuit Impedance converter Lead network Power Circuit • Constitution of 12-lead from the combination of sensors • A~J : Sensors • Example • Ⅰ: Output between A and E • aVR: Output between A and F Main amplifier Micro computer ADC Output equipment

  19. Book Knowledge RPS • ECG signal is very weak • The signal must not be amplified suddenly • Differential amplifier is used as head amplifier • An example of block diagram illustrating cardiography equipment An amplifier is needed Lead Code Head amplifier Isolation circuit Impedance converter Lead network The signal is amplified in stages Power Circuit • Noises are reduced • signal-to-noise ratio is improved Main amplifier Micro computer ADC Output equipment

  20. Book Knowledge RPS • An example of block diagram illustrating cardiography equipment Lead Code Head amplifier Isolation circuit Impedance converter Lead network Power Circuit • For securing of security, impedance converter, lead network and head amplifier have to be isolated from main amplifier, power circuit and A/D converter Main amplifier Micro computer ADC Output equipment

  21. Question RPS • A/D converter (AD9254) is included in HSMC • Pipelined switched capacitor ADC • Sampling frequency: 150MHz • Resolution: 14-bit • Power: 430mW HSMC Performance is overmuch • Clinically-important frequency component of ECG signal is from 0 to 250Hz 500Hz is enough for sampling frequency • Using a lot of electricity • Conversion process is complex • Using A/D converter in HSMC is of questionable value

  22. 心電計の回路を表すブロック図の例 RPS 誘導コード インピーダンス変換器 前置 増幅器 アイソレーション回路 誘導ネットワーク 電源回路 主増幅器 マイクロコンピュータ AD変換器 出力装置

  23. 標準１２誘導を作るための誘導ネットワークの原理標準１２誘導を作るための誘導ネットワークの原理 RPS B C D A~Jの各点の出力を組み合わせる。 例えば、第Ⅰ誘導はAとE、aVRはAとFを組み合わせたものとなる。 A E J F I H G

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