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関連する概念動画

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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Doppler Effect - I00:56

Doppler Effect - I

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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
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Doppler Effect - II01:05

Doppler Effect - II

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Genetic Material01:20

Genetic Material

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Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.
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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
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Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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関連する実験動画

Updated: Feb 13, 2026

Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography
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表面波エラストグラフィーとレーザー計測による多層軟性材料の特性評価

Nasser Ghaderi1, Ali Golmohammadi2, Simon Verspeek1

  • 1University of Antwerp, InViLab Research Group, Faculty of Applied Engineering, Groenenborgerlaan 171, Antwerp, 2020, Belgium.

Journal of biomechanics
|February 11, 2026
PubMed
まとめ

本研究では、表面波エラストグラフィーを用いて、層状の皮膚様材料のせん断波速度を測定する新しい方法を導入します。この技術は、皮膚層内の異常を正確に特定します。

キーワード:
順問題逆解析モデリングLDV多層弾性モデリングせん断波速度表面波エラストグラフィー

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Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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Laser Doppler Perfusion Imaging in the Mouse Hindlimb
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Laser Doppler Perfusion Imaging in the Mouse Hindlimb

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関連する実験動画

Last Updated: Feb 13, 2026

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Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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Laser Doppler Perfusion Imaging in the Mouse Hindlimb
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科学分野:

  • 生体医工学
  • 材料科学
  • 音響学

背景:

  • 層状媒体の機械的特性を特徴付けることは、組織の生体力学を理解するために重要です。
  • 皮膚の異常を評価するための非侵襲的方法には、せん断波速度の正確な測定が必要です。

研究 の 目的:

  • 多層軟部組織におけるせん断波速度を推定するための広帯域表面波エラストグラフィー技術を開発および検証すること。
  • 皮膚の異常を表す埋め込み内包物を特定する際の方法の精度を評価すること。

主な方法:

  • 3層ファントム上の圧電トランスデューサーによって生成された表面波を測定するために、走査型レーザー計測ドップラー（LDV）を使用しました。
  • 多層媒体の拡張レイリー波モデルを利用して、順問題解析と逆解析によるせん断波速度推定を可能にしました。
  • ヒト前腕皮膚でのin vivo測定で手法を検証しました。

主要な成果:

  • この手法は、皮膚の異常を模倣した層状ファントム内の硬い内包物（誤差1.5%）を正確に特定しました。; 考慮されていない粘弾性効果の影響を受け、周囲の層のせん断波速度を約10%の誤差で推定しました。; in vivo測定により、ヒト前腕皮膚での実現可能性と臨床的関連性を示しました。

結論:

  • LDVを用いた広帯域表面波エラストグラフィーは、層状皮膚組織の機械的特性を特徴付けるための高感度で適応性の高い方法です。
  • この技術は、皮膚の異常の診断と治療反応のモニタリングに有望です。
  • さらなる改良により、粘弾性モデルを組み込むことで精度を向上させることができます。