Evaluation of Examiner Performance Using a Duplex Ultrasound Simulator. Flow Velocity Measurements in Dialysis Access...

Area of Science:

• Medical Simulation
• Vascular Ultrasound
• Nephrology

Background:

• Dialysis access fistulas require accurate ultrasound assessment for proper function.
• Training and objective assessment of scanning skills are crucial for healthcare professionals.
• Current methods for assessing ultrasound proficiency can be subjective.

Purpose of the Study:

• To develop and validate a duplex ultrasound simulator for training and assessment.
• To evaluate examiner performance in measuring flow velocities in dialysis access fistulas using the simulator.
• To provide an objective method for assessing measurement accuracy in complex vascular structures.

Main Methods:

• Developed a duplex ultrasound simulator using 3-D ultrasound scans of dialysis fistulas.
• Reconstructed 3-D blood vessel models and simulated blood flow velocity fields.
• Generated 2-D B-mode and color Doppler images with spectral waveforms on a mannequin.
• Assessed examiner performance by comparing measured peak systolic velocity (PSV) with computational flow model data.

Main Results:

• The simulator accurately recreated 2-D ultrasound images and spectral Doppler waveforms.
• Expert examiners' PSV measurements deviated from true values by 7.8 ± 6.1%.
• Demonstrated the simulator's capability for objective assessment of measurement accuracy.

Conclusions:

• The developed duplex ultrasound simulator is a viable tool for training and assessment.
• The simulator enables objective evaluation of examiner accuracy in measuring velocities in dialysis access fistulas.
• This technology can improve the quality of ultrasound training and patient care.