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Related Concept Videos

Ultrasonography01:17

Ultrasonography

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.
During an ultrasonography procedure, a handheld device called a...
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Ultrasound II: Endoscopic Ultrasound and FibroScan

Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
Endoscopic Ultrasound (EUS):
Ultrasound I: Abdominal Ultrasonography01:20

Ultrasound I: Abdominal Ultrasonography

Introduction:
Abdominal ultrasonography, commonly known as abdominal ultrasound, is a vital, non-invasive medical imaging technique widely used in healthcare.
Procedure:
This diagnostic tool allows the clinician to visually inspect internal structures within the abdomen, including vital organs such as the liver, gallbladder, pancreas, kidneys, and spleen.
The abdominal ultrasound process begins with applying a special gel to the patient's skin over the abdomen. This gel enhances the...
Imaging Studies II: Ultrasonography01:24

Imaging Studies II: Ultrasonography

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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Design of Acoustic Bifocal Lenses Using a Fourier-Based Algorithm.

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Evaluation of the Feasibility, Safety, and Accuracy of an Intraoperative High-intensity Focused Ultrasound Device for Treating Liver Metastases
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M-Bonacci Zone Plates for Ultrasound Focusing.

Sergio Pérez-López1, José Miguel Fuster2, Pilar Candelas3

  • 1Centro de Tecnologías Físicas, Universitat Politècnica de València, 46022 València, Spain. serpelo1@teleco.upv.es.

Sensors (Basel, Switzerland)
|October 9, 2019
PubMed
Summary

M-bonacci zone plates offer bifocal ultrasound focusing with equal intensity. A new design parameter allows adjustable focal separation in acoustics and microwaves, simplifying lens design.

Keywords:
Fresnel zone plateM-bonacci zone plateacoustic focusingacoustic lens

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Area of Science:

  • Acoustics and Optics
  • Materials Science
  • Biomedical Engineering

Background:

  • Zone plates are planar lenses used for focusing waves.
  • M-bonacci sequences offer unique properties for optical and acoustic applications.
  • Bifocal lenses are desirable for applications requiring multiple focal points.

Purpose of the Study:

  • To analyze M-bonacci zone plates for ultrasound focusing.
  • To investigate bifocal focusing profiles with equal intensity.
  • To explore focal separation adjustment and its impact on focusing distortion.

Main Methods:

  • Numerical simulations of M-bonacci zone plates.
  • Theoretical analysis of focusing properties.
  • Experimental validation using ultrasound measurements.
  • Introduction of a new design parameter for M-bonacci lenses.

Main Results:

  • M-bonacci zone plates achieve bifocal focusing with equal intensity.
  • Focal separation can be adjusted in high-wavelength domains (acoustics, microwaves).
  • Adjusting focal separation introduces minor distortion, managed by a new design parameter.
  • Experimental results confirm simulation predictions.

Conclusions:

  • M-bonacci zone plates are promising for ultrasound focusing applications.
  • The adjustable focal separation enhances their versatility.
  • The introduced design parameter simplifies the development of M-bonacci lenses.