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Ultrasonic exposure in static and real time echography

S B Barnett, G Kossoff

    Ultrasound in Medicine & Biology
    |January 1, 1982
    PubMed
    Summary

    Static and real-time ultrasound devices emit similar energy per pulse. However, static M-mode examinations deliver significantly higher single-point energy exposure to tissues compared to real-time B-mode imaging.

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    Area of Science:

    • Medical Imaging
    • Biomedical Engineering
    • Diagnostic Ultrasound

    Background:

    • Ultrasound devices are widely used in medical diagnostics.
    • Understanding energy exposure from different ultrasound modalities is crucial for safety and efficacy.
    • Static and real-time ultrasound systems differ in their imaging mechanisms and potential energy delivery.

    Purpose of the Study:

    • To compare the ultrasonic energy output and exposure levels between static and real-time ultrasound devices.
    • To identify which ultrasound examination types result in the highest energy deposition in tissues.

    Main Methods:

    • Measurement of ultrasonic energy per pulse and peak instantaneous intensity for static and real-time devices.
    • Quantification of total energy used per examination and energy passing through a single point in tissue.
    • Comparison of energy exposure across different static (M-mode, simple/compound scans) and real-time (B-mode) examinations.

    Main Results:

    • Both static and real-time devices exhibited similar energy per pulse and peak intensity.
    • Static M-mode examinations showed the highest single-point energy exposure (120 mJ/min).
    • Real-time B-mode examinations resulted in substantially lower single-point exposure (0.018 mJ/echogram or 27 mJ/min).

    Conclusions:

    • While pulse energy is comparable, the total energy and single-point exposure vary significantly between static and real-time ultrasound.
    • Static M-mode examinations pose a higher risk of localized energy deposition compared to real-time B-mode.
    • This highlights the importance of considering examination type when assessing ultrasound energy exposure.

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