Characterization of a HIFU Fields Inside a Tissue Mimicking Phantom - Video

Onda's CTO, Dr. Sam Howard, presents a study on HIFU phantoms at the 7th International Symposium on Focused Ultrasound Abstract Number: P-TEC-7 Title: Characterization of HIFU fields inside of a Tissue-mimicking HIFU Phantom Sam Howard, Claudio Zanelli Onda Corporation, Sunnyvale, CA USA Background: Development of a tissue-mimicking, transparent, scatterer-free gel phantom for HIFU has been previously described [1]. Up until now, this material has been used only as a thermal phantom, as it combines 0.6 dB/cm/MHz absorption with a thermal marker allowing easy visual detection wherever the temperature exceeds 65 °C. Meanwhile, direct measurements of pressure are usually made in water. For piezoelectric hydrophones, damage or fouling is typically a concern for phantom usage. While reflectance-type fiber-optic hydrophones are easily refurbished by re cleaving, and are widely used in water because their pressure range exceeds 400 Mpa, the optical scatterers in most phantoms represent an impediment for accurate measurement. As our phantom does not have scatterers, we decided to investigate its use with the fiber-optic hydrophone, in the hope of developing a technique which will be useful for treatment planning and quality assurance.