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For Measurement of ECG

For Measurement of ECG

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For Measurement of ECG

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  1. RPS For Measurement of ECG m5151117 Yumiko Kimezawa

  2. Outline RPS • Our Architecture • Important Things in Measurement of ECG Signal • Book Knowledge • Question • Requirements for Measurement of ECG • Future Work

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

  4. 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

  5. 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

  6. 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

  7. 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

  8. Book Knowledge RPS • ECG signal is very weak • The signal must not be amplified suddenly • Differential amplifier is usedas 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

  9. 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

  10. 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

  11. Requirements for Measurement of ECG RPS • An amplifier is needed • Securing of security also have to be considered

  12. Future Work RPS • Studying cardiography equipment using digital filtering techniques

  13. RPS

  14. 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

  15. 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