EPI proton resonant frequency temperature mapping at 0.5T in the brain: Comparison to single‐echo gradient recalled echo.
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| Title: | EPI proton resonant frequency temperature mapping at 0.5T in the brain: Comparison to single‐echo gradient recalled echo. |
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| Authors: | Martinez, Diego F.1 (AUTHOR) dmart62@uwo.ca, Wiens, Curtis N.2 (AUTHOR), Harris, Chad T.2 (AUTHOR), Handler, William B.1 (AUTHOR), Chronik, Blaine A.1 (AUTHOR) |
| Source: | Magnetic Resonance in Medicine. Apr2025, Vol. 93 Issue 4, p1733-1740. 8p. |
| Subjects: | Optical measurements, Magnetic resonance imaging, Temperature control, Temperature measurements, Brain mapping |
| Abstract: | Purpose: Evaluate the use of both single‐echo gradient recalled echo (SE‐GRE) and EPI approaches to creating temperature maps on a mid‐field head‐only scanner, both in vivo and on a tissue mimicking gel. Methods: Three 2D protocols were investigated (an SE‐GRE, single‐shot EPI, and an averaged single‐shot EPI). The protocols used either a gradient recalled acquisition or an echo planar acquisition, with EPI parameters optimized for the longer T2*$$ {\mathrm{T}}_2^{\ast } $$ at lower field‐strengths. Phantom experiments were conducted to evaluate temperature tracking while cooling, comparing protocol to measurements from an optical fiber thermometer. Studies were performed on a 0.5T head only MR scanner. Temperature stability maps were produced in vivo for the various protocols to evaluate precision. Results: The use of an EPI protocol for thermometry improved temperature precision in a temperature control phantom and provided an 18% improvement in temperature measurement precision in vivo. Temperature tracking using a fast (<2 s) update rate EPI thermometry sequence provided a similar precision to the slower SE‐GRE protocol. Conclusion: While SE‐GRE PRF thermometry shows good performance, EPI methods offer improved tracking precision or update rate, making them a better option for thermometry in the brain at mid‐field. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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