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The Wave Nature of Light02:12

The Wave Nature of Light

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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
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Gastric motility is the coordinated contraction and relaxation of stomach muscles that convert ingested food into chyme, a semi-liquid substance ready for further digestion in the intestines. The process begins with the vagus nerve inducing the relaxation of the smooth muscles in the fundus and body of the stomach, allowing these regions to expand and accommodate up to approximately 1.5 liters of food and liquid.
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Gastric emptying occurs when the stomach gradually releases chyme into the duodenum. When the stomach is distended, it triggers the release of gastrin, a hormone that promotes gastric acid secretion to aid in digestion. Additionally, stomach distension contributes to peristaltic waves that propel gastric contents toward the pyloric region. The gastroenteric reflex, on the other hand, primarily stimulates peristalsis in the intestines, facilitating the movement of contents further along the...
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The gastric phase of digestion begins as soon as food enters the stomach. The incoming food bolus triggers neural and hormonal mechanisms, which last approximately 3 to 4 hours. During this phase, the stomach undergoes significant changes to prepare the food for further digestion and absorption.
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Using Wavelet Entropy to Demonstrate how Mindfulness Practice Increases Coordination between Irregular Cerebral and Cardiac Activities
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胃内視鏡記録における胃内圧波形記録のためのウェーブレットベースのノイズ除去最適化

Peter Tremain1,2, Jarrah M Dowrick1, Leo K Cheng1

  • 1Auckland Bioengineering Institute, University of Auckland Auckland New Zealand.

Healthcare technology letters
|January 26, 2026
PubMed
まとめ

新しい離散ウェーブレット変換（DWT）法は、従来のフィルタリングと比較して、内視鏡胃生体電気記録における優れたノイズ除去を提供する。この進歩により、遅波検出とデータ処理効率が向上する。

キーワード:
生体電位生体計測離散ウェーブレット変換疾患ヘルスケア医学的障害信号デノイジング

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科学分野:

  • 生物医学工学;信号処理;消化器病学

背景:

  • 胃の生体電気的遅波を記録するための低侵襲内視鏡法の出現。既存のフィルタリング技術は、侵襲的記録のプロトコルに基づいており、その有効性を制限しています。正確な内視鏡胃記録には、最適化された信号処理が必要です。

研究 の 目的:

  • 内視鏡胃生体電気信号のデノイジングにおける離散ウェーブレット変換（DWT）の有効性を評価すること。DWTのパフォーマンスと従来のSavitzky-Golay（SG）フィルタリングを比較すること。SGフィルタリングとDWTの組み合わせ適用を調査すること。

主な方法:

  • 患者データとノイズを使用して、合成胃生体電気信号を作成しました。離散ウェーブレット変換（DWT）を989のパラメータの組み合わせで適用しました。比較基準としてSavitzky-Golay（SG）フィルタリングを使用しました。SGフィルタリングとDWTの組み合わせを分析しました。

主要な成果:

  • DWTベースの方法は、中程度のSNR信号に対して6つのパフォーマンスメトリックすべてにおいて、従来のSGフィルタリングを大幅に上回りました。DWTは、信号歪み率の改善、二乗平均平方根誤差の削減、およびノイズ補正率の向上を示しました。SGとDWTの組み合わせは、SG単独よりも強化されたデノイジングを提供し、DWT単独よりも信号歪みが少なくなりました。

結論:

  • 離散ウェーブレット変換（DWT）は、従来のSGフィルタリングよりも効果的な内視鏡胃生体電気記録のノイズ除去を提供します。最適化されたDWTデノイジングは、遅波活性化のより良い自動検出を促進します。この進歩により、胃の生体電気データのより信頼性の高い効率的な処理が可能になります。