Abstract

In vivo pressure estimations for therapeutic ultrasound has the potential of rendering treatments using non-invasive ultrasound targeting safer and more reliable. By quantifying pressures and their respective spatial locations, better acoustic predictions and models can be made. In this thesis, we aim to measure a pressure field from a piezo-electric transducer through a ballistic gel medium by using an external gradient coil to encode the pressure field in a way that can be read and quantified using an MRI scanner. We describe the methods and the results pertaining to visualizing a pressure field. The setup was able to capture pressure field images and quantify low pressures, as compared to a hydrophone measurement, with maximum peaks of 100 kPa. We found that the confidence interval of the MRI estimated pressure to have a 95% confidence interval of 46 kPa as compared to the hydrophone measurement. We also showed that the MRI measurement setup had an accuracy of 5 kPa within 2 cm from the front of the transducer. The results showed that pressure fields could eventually be reconstructed with precision and accuracies close to that of a hydrophone equivalent acquisition. However, there are still many changes to the methodology that would need to be done.

Degree

MS

College and Department

Ira A. Fulton College of Engineering; Electrical and Computer Engineering

Rights

https://lib.byu.edu/about/copyright/

Date Submitted

2024-10-21

Document Type

Thesis

Handle

http://hdl.lib.byu.edu/1877/etd13416

Keywords

Magnetic Resonance Imaging, ultrasound, gradient coil, ultrasound visualization, pressure measurement

Language

english

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