Deline ation of noise signals from MRI measured temperature rise during HIFU ablation procedure

Subhashish Dasgupta, Seyed Ahmed Dibaji, Janaka Wansapura, Matthew R. Myers, Rupak K. Banerjee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A relatively recent and non invasive method for characterizing thermal fields generated by high intensity focused ultrasound (HIFU) transducers is Magnetic Resonance (MR) Thermometry method. However, noise signals generated by external RF sources infiltrate the scanner orifice and limit its ability to measure temperature rise during the heating or ablation phase. In this study, MRI monitored HIFU ablations are performed on freshly excised porcine liver samples, at varying sonication times, 20, 30 and 40 s at a constant acoustic intensity level of 1244 W/cm2. Temperature rise during the procedure is measured using Proton Resonant Frequency MR thermometry. Preliminary experiments without an adequate noise filter, failed to record temperature rise during the heating phase. A low pass R-C filter circuit is subsequently incorporated into the experimental set up to prevent infiltration of noise signals in the MRI orifice. This modified RC filter enables measurement of temperature rise during the heating phase followed by temperature decay during cooling. The measured data is within 12% agreement with the temperature rise computed by solving the acoustic and heat equations.

Original languageEnglish (US)
Title of host publicationASME 2011 Summer Bioengineering Conference, SBC 2011
Pages113-114
Number of pages2
EditionPARTS A AND B
DOIs
StatePublished - 2011
Externally publishedYes
EventASME 2011 Summer Bioengineering Conference, SBC 2011 - Farmington, PA, United States
Duration: Jun 22 2011Jun 25 2011

Publication series

NameASME 2011 Summer Bioengineering Conference, SBC 2011
NumberPARTS A AND B

Other

OtherASME 2011 Summer Bioengineering Conference, SBC 2011
CountryUnited States
CityFarmington, PA
Period6/22/116/25/11

ASJC Scopus subject areas

  • Bioengineering

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