Update on safety of diagnostic ultrasonography.

Area of Science:

• Medical Imaging
• Biophysics
• Ultrasound Technology

Background:

• Diagnostic ultrasonography technology is advancing, leading to increased ultrasonic exposure levels.
• Nonthermal cavitational bioeffects are a known concern, but thermal mechanisms are gaining attention for risk assessment.
• Higher ultrasound intensities raise safety considerations, particularly for sensitive applications like fetal examinations.

Purpose of the Study:

• To analyze evolving safety considerations in diagnostic ultrasonography.
• To identify potential risks associated with increased ultrasonic power and thermal bioeffects.
• To discuss strategies for mitigating safety concerns in clinical ultrasound applications.

Main Methods:

• Review of recent analyses on ultrasound bioeffects.
• Examination of trends in ultrasound instrument performance and output.
• Assessment of safety concerns related to thermal mechanisms in diagnostic ultrasound.

Main Results:

• Increased ultrasonic power in new devices necessitates re-evaluation of safety protocols.
• Thermal bioeffects, especially concerning fetal bone heating from pulsed-Doppler beams, are a critical area of concern.
• The threshold nature of thermal damage suggests flexible output limits can manage risks.

Conclusions:

• Evolving diagnostic ultrasound technology requires continuous safety assessment.
• Proactive development of output limits and adherence to standards are crucial for safe clinical practice.
• The ultrasonics community is actively addressing safety issues through research, standards, and education.