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Found a good paper here outlining MR vs US (see table 2).

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3064817/

The "expensive thermometer" point is interesing. Cant we develop a cheaper one?

Good paper, but it focuses on cancer applications but it would be a disservice to not point out the strides that HIFU is making in drug delivery[1], neurosurgery, and neuromodulation[3].

The (un)fortunate point of MRI thermometry is that is not only very effective at reading temperatures, but it can also produce thermal dosage maps that help in characterizing tissue leisioning (the exact response of HIFU ablated tissue is still be debated). On top of that you also get traditional MRI imaging essentially for free.

[1] https://www.nature.com/articles/s41598-018-25904-9

[2] https://www.fusfoundation.org/diseases-and-conditions/neurol...

[3] https://ieeexplore.ieee.org/abstract/document/8925600

Thank you for this. I will read these later!

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