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Ultrasound Machine Comparison: An Evaluation of Ergonomic Design, Data Management, Ease of Use, and Image Quality

Wynd, Kimberly P. MBBCh; Smith, Hugh M. MD, PhD; Jacob, Adam K. MD; Torsher, Laurence C. MD; Kopp, Sandra L. MD; Hebl, James R. MD

Regional Anesthesia and Pain Medicine: July-August 2009 - Volume 34 - Issue 4 - p 349-356
doi: 10.1097/AAP.0b013e3181ac9e5b
Ultrasound Articles

Background and Objectives: The use of ultrasound technology for vascular access and regional anesthesia is gaining widespread acceptance among anesthesia providers. As a result, many group practices and medical institutions are considering purchasing ultrasound equipment. Currently, comparative information regarding the ergonomic design, physical and adjustable features, data management, ease of use, cost, and image quality of various ultrasound machines is not available. The primary goal of this investigation was to develop an objective process of evaluating ultrasound equipment before purchase. The process of evaluation used in the current investigation may be used when comparing a variety of medical technologies.

Methods: A randomized, side-by-side comparative evaluation of 7 different ultrasound machine models was performed. Sixteen resident physicians without prior ultrasound experience (inexperienced providers) completed a formal evaluation of each machine model after performing a standardized machine configuration and performance checklist. Inexperienced providers and 10 faculty members experienced in ultrasound-guided regional anesthesia evaluated the image quality of 2 standardized images acquired from each machine model.

Results: Overall, evaluators rated questions on the machine evaluation form as "very good" or "outstanding" 70% or more of the time for all machine models. The largest, most complex ultrasound machine was rated as having the best image quality by both inexperienced and experienced providers. Ultrasound machine models with the simplest ergonomic design and user interface were rated highest by inexperienced study participants.

Conclusions: Anesthesia providers considering an ultrasound equipment purchase should objectively evaluate machine models that have features most important to their own clinical practice. Ergonomic design, physical and adjustable features, data management, ease of use, image quality, and cost are important features to consider when evaluating an ultrasound machine.

From the Department of Anesthesiology Mayo Clinic College of Medicine Rochester, MN.

Accepted for publication November 4, 2008.

Address correspondence to: James R. Hebl, MD, Department of Anesthesiology, Mayo Clinic, 200 First St, SW Rochester, MN 55905 (e-mail:

This study was supported by Mayo Clinic Department of Anesthesiology.

©2009 American Society of Regional Anesthesia and Pain Medicine