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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
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Related Experiment Video

Updated: Jan 26, 2026

Application of Ultrasound and Shear Wave Elastography Imaging in a Rat Model of NAFLD/NASH
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Quantitative breast elastography from B-mode images.

Carolina Rabin1, Nicolás Benech1

  • 1Instituto de Física, Facultad de Ciencias, UDELAR, Iguá 4225, 11400, Montevideo, Uruguay.

Medical Physics
|April 12, 2019
PubMed
Summary

This study quantifies breast tissue elasticity using ultrasound elastography. The developed method successfully maps Young

Area of Science:

  • Biomedical Engineering
  • Medical Imaging Physics
  • Acoustics

Background:

  • Elastography noninvasively assesses soft tissue mechanical properties.
  • Ultrasound elastography aids in diagnosing abnormalities and differentiating suspicious findings.
  • Quantifying tissue elasticity is crucial for accurate medical diagnoses.

Purpose of the Study:

  • To investigate the feasibility of quantifying breast tissue Young's modulus using ultrasound B-mode images.
  • To develop a physics-based approach for elasticity mapping from diffuse acoustic fields.
  • To assess the potential of conventional ultrasound scanners for quantitative elastography.

Main Methods:

  • Utilized the autocorrelation of a diffuse acoustic field to relate shear modulus to tissue properties.
Keywords:
B-modelow frame ratequantitative breast elastographyvideo output

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  • Developed a mechanical prototype device for diffuse field generation compatible with clinical ultrasound.
  • Measured displacement fields from B-mode images acquired at standard frame rates (30-50 Hz).

    • Main Results:

    • Successfully reconstructed Young's modulus maps for breast tissue phantoms and in vivo measurements.
    • Phantom results showed good agreement with manufacturer's values (e.g., inclusion ~60 KPa, background ~20 KPa).
    • In vivo measurements accurately reflected known pathology (e.g., malignant tumor ~98 KPa, normal tissue ~25 KPa).

    Conclusions:

    • Demonstrated successful reconstruction of quantitative breast tissue elasticity maps using conventional ultrasound.
    • The developed technique shows promise as a clinical tool for quantitative elastography.
    • This method enables noninvasive assessment of breast tissue mechanical properties.