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関連する概念動画

Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...
Heart Sounds01:15

Heart Sounds

Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...
Sampling Continuous Time Signal01:11

Sampling Continuous Time Signal

In signal processing, a continuous-time signal can be sampled using an impulse-train sampling technique, followed by the zero-order hold method. Impulse-train sampling involves the use of a periodic impulse train, which consists of a series of delta functions spaced at regular intervals determined by the sampling period. When a continuous-time signal is multiplied by this impulse train, it generates impulses with amplitudes corresponding to the signal's values at the sampling points.
In the...

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関連する実験動画

Updated: Jul 23, 2026

Assessing the Coherence of Parents' Short Narratives Regarding their Child Using the Five-Minute Speech Sample Procedure
07:56

Assessing the Coherence of Parents' Short Narratives Regarding their Child Using the Five-Minute Speech Sample Procedure

Published on: September 19, 2019

エコーカルディオグラフィによるシストリック時間間隔

M A Stefadouros, A C Witham

    Circulation
    |January 1, 1975
    PubMed
    まとめ

    新しいエコーカルディオグラム法では,従来のフォノカルディオグラムが失敗したときのシストリック時間間隔を正確に測定します. この非侵襲的テクニックは,重要な心臓診断の信頼性の高い代替手段を提供します.

    科学分野:

    • 心臓病学 心臓病学
    • メディカルイマージング (医学イメージング)
    • バイオメディカルエンジニアリング

    背景:

    • フォノカルディオグラムと頸動脈パルスは,技術的な記録の課題を提示することができます.
    • 収縮時間間隔の正確な決定は,臨床的に有意である.
    • 収縮時間間隔を測定するための既存の方法は,時に信頼性が低い.

    研究 の 目的:

    • 静脈収縮時間間隔の決定のための大動脈弁エコーカルディオグラフィの有効性を評価する.
    • 収縮時間間隔測定のための代替的非侵襲的方法の確立.
    • エコーカルディオグラフィーで得られた間隔を従来の方法と比較するために.

    主な方法:

    • 52人の患者の大動脈弁エコーカルジオグラムの高速ストライプチャート記録を使用しました.
    • 計算されたエジェクション時間 (大動脈弁の開閉).
    • 予行放出期間 (Q波から大動脈弁の閉塞まで) と予行放出期間/放出時間の比率.

    主要な成果:

    • 36人の患者に満足のいくエコーカルディオグラムの記録が得られた.
    • エコーカルディオグラフィーと従来の方法の間で高い相関関係 (r > 0.97) が観察されました.

    さらに関連する動画

    Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
    06:04

    Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

    Published on: March 24, 2023

    Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis
    05:48

    Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis

    Published on: August 9, 2024

    関連する実験動画

    Last Updated: Jul 23, 2026

    Assessing the Coherence of Parents' Short Narratives Regarding their Child Using the Five-Minute Speech Sample Procedure
    07:56

    Assessing the Coherence of Parents' Short Narratives Regarding their Child Using the Five-Minute Speech Sample Procedure

    Published on: September 19, 2019

    Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
    06:04

    Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

    Published on: March 24, 2023

    Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis
    05:48

    Memorization-Based Training and Testing Paradigm for Robust Vocal Identity Recognition in Expressive Speech Using Event-Related Potentials Analysis

    Published on: August 9, 2024

  • 測定された間隔の差異は統計的に無意味であり,射出時間は最大16msecで異なっていた.

    • 結論:

    • 大動脈弁エコーカルディオグラフィは,収縮時間間隔の決定のための有効な非侵襲的代替手段です.
    • この方法は,技術的な困難が従来の技術を妨げるときに特に有用です.
    • エコーカルディオグラフィは,精密な信頼性の高いシストリック時間間隔データを提供します.