How accurate are therapeutic ultrasound machines?

Schabrun, Siobhan, Walker, Hayley and Chipchase, Lucy (2008) How accurate are therapeutic ultrasound machines?. Hong Kong Physiotherapy Journal, 26 1: 39-44. doi:10.1016/S1013-7025(09)70006-5

Author Schabrun, Siobhan
Walker, Hayley
Chipchase, Lucy
Title How accurate are therapeutic ultrasound machines?
Journal name Hong Kong Physiotherapy Journal   Check publisher's open access policy
ISSN 1013-7025
Publication date 2008-01-01
Sub-type Article (original research)
DOI 10.1016/S1013-7025(09)70006-5
Open Access Status DOI
Volume 26
Issue 1
Start page 39
End page 44
Total pages 6
Place of publication Hong Kong
Publisher Hong Kong Physiotheraphy Association
Language eng
Subject 1106 Human Movement and Sports Science
11 Medical and Health Sciences
Abstract Ultrasound machines are frequently used by physiotherapists. Thus, it is imperative that machines are accurate for safe and effective treatments. This study aimed to examine the accuracy of therapeutic ultrasound machines in terms of power output and timing function, and to determine factors that relate to the degree of machine accuracy. An observational design was used. Sixty-four machines were sampled. Machines were tested at three power settings, two frequencies, and pulsed and continuous modes. Timers were assessed for 5- and 10-minute durations. Ultrasound machines were considered inaccurate if they deviated by more than ± 20% and timers if they deviated by ± 10%. Fifty-nine percent (291/492) of power tests were inaccurate, with 79% of these producing less power output than depicted on the dial. Thirty-seven percent of timers were inaccurate, with mechanical timers more inaccurate than digital timers (p < 0.05). Older ultrasound machines were more likely to be inaccurate (p < 0.05). Length of time since machine calibration was also associated with machine inaccuracy at 3 MHz (p < 0.05). There is a high level of power and timer inaccuracy in machines that may be related to machine age and frequency of calibration. This study highlights the need for therapists to be aware of the potential for machine inaccuracy and for stricter guidelines on machine calibration to be introduced.
Keyword accuracy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Health and Rehabilitation Sciences Publications
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Citation counts: Scopus Citation Count Cited 3 times in Scopus Article | Citations
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