Hemodynamic Evaluation and Measurement: Overcoming Limitations for Flow

Study: University Clinic in Regensburg evaluates Carestream Touch Prime Ultrasound System for hemodynamic evaluation and measurement

Dr. Isabel Wiesinger, University Clinic, Regensburg

For hemodynamic evaluation and measurement, conventional Doppler ultrasound can only provide a partial picture. A persistent limitation has been the angle of insonation for Doppler examinations.

Calculating the velocity of a flow relies on knowing the precise angle of the ultrasound beam relative to the direction of flow. In conventional ultrasound systems, the practical insonation angle is limited to around 60°. For greater angles, even small errors in the angle can cause unacceptably large distortions in the results.Image from Touch Prime Ultrasound system

Overcoming this restriction for evaluating flow in vessels requires repositioning the transducer which can be uncomfortable for the sonographer. Additionally, the limitation is not as easy to work around when assessing regions of turbulent blood flow. An example is trying to understand the effects of stenoses in vessels or valves, or when evaluating fistulae.

Overcoming angular restrictions

Smart Flow imaging technology in the CARESTREAM Touch Prime Ultrasound Systems overcomes the angular restrictions. It generates a part of the ultrasound vibration that is effectively at a right angle to the beam. The system then interprets the resulting 2D interference patterns in the received ultrasound signal to present a more complete picture of the flow, representing it with shaded color-coding and arrows. Continue reading