An Adaptive Non-Local-Means Filter for Real-Time MR-Thermometry

Cornel Zachiu 1 Mario Ries 1 Chrit Moonen 1 Baudouin Denis de Senneville 1, 2, 3
3 MONC - Modélisation Mathématique pour l'Oncologie
IMB - Institut de Mathématiques de Bordeaux, Inria Bordeaux - Sud-Ouest, Institut Bergonié - CRLCC Bordeaux
Abstract : Proton resonance frequency shift-based magnetic resonance thermometry is a currently used technique for monitoring temperature during targeted thermal therapies. However, in order to provide temperature updates with very short latency times, fast MR acquisition schemes are usually employed, which in turn might lead to noisy temperature measurements. This will, in general, have a direct impact on therapy control and endpoint detection. In the current study we address this problem through an improved non-local filtering technique applied on the temperature images. Compared to previous non-local filtering methods, the proposed approach takes into account not only spatial information, but also exploits temporal redundancies. The method is fully automatic and designed to improve the precision of the temperature measurements while at the same time maintaining output accuracy. Additionally, the implementation was optimized in order to ensure real-time availability of the temperature measurements while having a minimal impact on latency. The method was validated in three complementary experiments: a simulation, an ex-vivo and an in-vivo study. Compared to the original non-local means filter and two other previously employed temperature filtering methods, the proposed approach shows considerable improvement in both accuracy and precision of the filtered data. Together with the low computational demands of the numerical scheme, the proposed filtering technique shows great potential for improving temperature measurements during real-time MR thermometry dedicated to targeted thermal therapies.
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Article dans une revue
IEEE Transactions on Medical Imaging, Institute of Electrical and Electronics Engineers, 2017, 36 (4), pp.904-916. 〈10.1109/TMI.2016.2627221〉
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https://hal.archives-ouvertes.fr/hal-01461332
Contributeur : Baudouin Denis de Senneville <>
Soumis le : vendredi 21 décembre 2018 - 10:43:24
Dernière modification le : mercredi 9 janvier 2019 - 18:49:22

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Cornel Zachiu, Mario Ries, Chrit Moonen, Baudouin Denis de Senneville. An Adaptive Non-Local-Means Filter for Real-Time MR-Thermometry. IEEE Transactions on Medical Imaging, Institute of Electrical and Electronics Engineers, 2017, 36 (4), pp.904-916. 〈10.1109/TMI.2016.2627221〉. 〈hal-01461332〉

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