Survey of Use and Performance of Ultrasonic Therapy Equipment in Pinellas County, Florida

Stewart, Harold F.; Harris, Gerald R.; Herman, Bruce A.; Robinson, Ronald A.; Haran, Michael E.; McCall, George R.; Carless, George; Rees, D. C.

doi:10.1093/ptj/54.7.707

Cited by 26 publications

(3 citation statements)

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“…Numerous surveys designed to test the performance of physiotherapy ultrasound equipment have been undertaken globally over the last 30 years [15][16][17][18][19][20]. These show that the vast majority of systems display errors in the indicated output settings of greater than 20%: Pye and Milford [19] tested 85 therapy machines in the Lothian Region of Scotland, and found that 81% of machines had power outputs in error by more than ±20%, and 69% had power outputs in error by more than ±30%.…”

Section: Physiotherapy Ultrasoundmentioning

confidence: 99%

Calibration and measurement issues for therapeutic ultrasound

Shaw

Hodnett

2008

Ultrasonics

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Section: Physiotherapy Ultrasoundmentioning

confidence: 99%

Calibration and measurement issues for therapeutic ultrasound

Shaw

Hodnett

2008

Ultrasonics

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“…10,[16][17][18][19] In each of these studies the US machines were tested at maximum output. The mean (SD) percentage of machines found to be inaccurate was 68 .…”

Section: Single Test Performedmentioning

confidence: 99%

The accuracy of therapeutic ultrasound equipment: a systematic review

Schabrun

Walker

Chipchase

2008

Physical Therapy Reviews

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Objectives: Because of its importance for patient safety and treatment efficacy, the volume and methodological quality of the evidence available on the accuracy of therapeutic ultrasound equipment is examined with respect to power output and timing function. Evidence for a causal relationship between ultrasound inaccuracy and machine age, brand, frequency of use and intensity settings is also examined. Methods: A systematic literature search was performed to identify observational studies examining levels of ultrasound machine inaccuracy. Methodological quality was examined using the Sheffield University hierarchy of evidence and a modified version of the McMaster University critical appraisal tool. Data was pooled using the descriptive statistics (mean, standard deviation, percentage) available in each study. Results: Eighteen studies out of 47 were retained for review. Methodological scores ranged from 2 to 15 . 5 (maximum 20). Two thirds of ultrasound machines (64 . 6%; SD 23 . 2; range 14-100%) were found to produce an inaccurate power input. The average percentage of timers found to be inaccurate was 30 . 1 and 22 . 6% at 5 and 10 min, respectively. The only variable correlated with level of machine inaccuracy was that of machine age. Discussion: The current review indicates that a significant proportion of ultrasound machines produce inaccurate power outputs or have an inaccurate timing function. This finding has implications for both clinical practice and therapeutic ultrasound research.

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“…THE MEASUREMENT of the effective radiating area (ERA) of ultrasonic physical therapy devices is an important aspect of their calibration (Stewart et al 1974;Allen and Battye 1978;Fyfe and Parnell 1982). Space-averaged effective intensity, defined as the ratio of the ultrasonic power to the effective radiating area (ERA), is one of the primary treatment parameters selected in physical-therapy insonation.…”

Section: Introduction*mentioning

confidence: 99%

Sensitivity of Effective Radiating Area Measurement for Therapeutic Ultrasound Transducers to Variations in Hydrophone Scanning Technique

Bly¹,

Hussey²,

Kingsley³

et al. 1989

Health Physics

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Clinical efficacy and safety may be compromised if output from ultrasonic therapy transducers differs significantly from the indicated value. Space-averaged effective intensities selected for treatment are a ratio of the emitted ultrasonic power to the effective radiating area (ERA). In this study, ERA measurements for 17 commercially available devices were obtained by using a hydrophone scanning technique, and sources of systematic error were assessed by computer simulation. Marginal differences in technique may lead to differences of up to 50% in measured values. Suggestions are made for the improvement of consistency in such measurements.

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Survey of Use and Performance of Ultrasonic Therapy Equipment in Pinellas County, Florida

Cited by 26 publications

References 0 publications

Calibration and measurement issues for therapeutic ultrasound

Calibration and measurement issues for therapeutic ultrasound

The accuracy of therapeutic ultrasound equipment: a systematic review

Sensitivity of Effective Radiating Area Measurement for Therapeutic Ultrasound Transducers to Variations in Hydrophone Scanning Technique

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