Exposure Criteria for Medical Diagnostic Ultrasound: II. by National Council on Radiation Protection and Measurements

By National Council on Radiation Protection and Measurements

This record deals present perspectives on publicity standards for clinical diagnostic ultrasound. issues lined contain: nonthermal mechanisms for bioeffects, noninertial cavitation, nonlinear bubble responses and inertial cavitation, versions for publicity estimation in humans, and epidemiology of ultrasound publicity.
Content:
• entrance subject
• Preface
• desk of Contents
• 1. government precis
• 2. creation
three. Nonthermal Mechanisms for Bioeffects within the Absence of Cavitation
four. Noninertial Cavitation; Gas-Body Activation
five. Nonlinear Bubble reaction; Inertial Cavitation
6. Bioeffects of Noninertial Cavitation regarding unfastened and Stabilized fuel our bodies in Non-Mammalian structures
7. Bioeffects of Inertial Cavitation in vitro
eight. Bioeffects of Acoustic Cavitation in Mammalian Tissues
nine. versions for publicity Estimation in humans
10. hired and wanted Sound strain Waveforms
eleven. Temperature Elevation and Its organic results
12. Epidemiology of Ultrasound publicity
thirteen. precis and Conclusions
14. options
• Appendix A: Mechanical Equilibrium of unfastened Bubbles
Appendix B: Output exhibit ordinary
• Appendix C: Nepers and Decibels
Appendix D: Nonlinear Propagation: An replace
• thesaurus
• Symbols
• References
• The NCRP
• NCRP courses
• Index

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Extra resources for Exposure Criteria for Medical Diagnostic Ultrasound: II. Criteria Based on All Known Mechanisms

Example text

The noise was not affected by directing the beam at the cochlea. The other five subjects were examined with equipment which allowed the relevant parameters to be varied independently. It was found that increasing SPTA intensity (from 0 to 500 mW cm‫מ‬2) caused the perceived loudness to increase, increasing PRF (from 500 Hz to 10 kHz) increased the pitch, and changing the pulse duration (from 2 to 10 ␮s) had no effect. The authors did not identify a specific mechanism, but considered acoustic radiation pressure as one of several possibilities.

In general, a body suspended in a sonicated liquid will be subject, not only to acoustic radiation force, but also to an allied phenomenon, acoustic radiation torque. If the body is free to rotate, this torque may set it into steady spinning, or may cause it to seek a preferred orientation, depending on the degree of asymmetry possessed by the body. In a review of the subject, Nyborg (1978) discussed acoustical theory for different situations. For example, the acoustic radiation torque on a disc causes it to seek an orientation where its axis is Fig.

The progress of repair was assessed by histology and microradiography of the fracture site at two, four and six weeks after injury. 4 UNIDENTIFIED NONTHERMAL MECHANISMS / 45 over 75 percent of the animals.

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