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Ultrasonography01:17

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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In any LTI (Linear Time-Invariant) system, the convolution of two signals is denoted using a convolution operator, assuming all initial conditions are zero. The convolution integral can be divided into two parts: the zero-input or natural response and the zero-state or forced response, with t0 indicating the initial time.
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In the standard form, the transfer function is shown in constant gain, poles/zeros at origin, simple poles/zeros, and quadratic poles/zeros; each contributing uniquely to the system's overall response. The term represents the magnitude of the simple zero:
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IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
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The important convolution properties include width, area, differentiation, and integration properties.
The width property indicates that if the durations of input signals are T1 and T2, then the width of the output response equals the sum of both durations, irrespective of the shapes of the two functions. For instance, convolving two rectangular pulses with durations of 2 seconds and 1 second results in a function with a width of 3 seconds.
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Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
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超音波検査のためのバーカーと相互直角のゴレイ補足コードのコンヴォレーション

Chengxiang Peng1, Paul Annus2, Marek Rist2

  • 1Department of Civil Engineering and Architecture, Tallinn University of Technology, 19086 Tallinn, Estonia.

Sensors (Basel, Switzerland)
|August 28, 2025
PubMed
まとめ

超音波検査 (UT) は信号衰弱に問題があります. 新しいBarker-convolved mutually orthogonal Golay complementary code (BMOGCC) は,非破壊的テスト (NDT) の信号エネルギーと効率を向上させています.

キーワード:
暗号化された信号非破壊的試験時間の効率化超音波検査

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科学分野:

  • 材料科学
  • 音響学
  • 非破壊的試験

背景:

  • 超音波検査 (UT) は材料の完全性評価に不可欠ですが,特定の材料の信号衰弱に苦しんでいます.
  • UTにおける従来の興奮信号は,減弱による低エネルギーと劣った解釈性を有する.
  • バーカーコードや補完的なゴレイコード (CGC) のような既存のコード化された刺激方法は,シーケンス長さや時間効率に制限があります.

研究 の 目的:

  • 新しいコード化された刺激技術である,バーカー-コンボルトの相互直交のゴレイ補足コード (BMOGCC) を導入する.
  • バルカー・コードと相互直角のゴレイ補足コード (MOGCC) の利点を組み合わせることで,既存の方法の限界を解決する.
  • 超音波検査用のBMOGCCの性能を評価する.

主な方法:

  • Barker-convolved mutually orthogonal Golay complementary code (BMOGCC) を開発した.これは,BarkerのコードをMOGCCとコンボイルすることで実現した.
  • BMOGCCの性能を評価するために数値シミュレーションと実験を行いました.
  • 評価された主要な性能指数:ピークサイドロブレベル (PSL),メインロブゲイン (MG),および一時解像度.

主要な成果:

  • BMOGCCは,単独のバーカーコードまたはMOGCCと比較して,メインロブ・ゲイン (MG) が著しく高いことを示した.
  • 提案された方法は低ピークサイドロブレベル (PSL) を維持した.
  • BMOGCCは超音波検査信号の時間解像度を保持しました.

結論:

  • BMOGCCは,超音波検査で信号エネルギーと信号対ノイズ比を効果的に高めています.
  • CGCのような従来の方法と比較して,新しいコードは時間の効率を向上させています.
  • BMOGCCは,非破壊的試験における信号品質と測定効率を改善するための有望なソリューションです.