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Multiecho pseudo‐golden angle stack of stars thermometry with high spatial and temporal resolution using k‐space weighted image contrast
Author(s) -
Svedin Bryant T.,
Payne Allison,
Bolster Bradley D.,
Parker Dennis L.
Publication year - 2018
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26797
Subject(s) - image resolution , imaging phantom , nuclear magnetic resonance , magnetic resonance imaging , echo time , contrast (vision) , breast imaging , physics , materials science , computer science , nuclear medicine , optics , medicine , cancer , breast cancer , mammography , radiology
Purpose Implement and evaluate a 3D MRI method to measure temperature changes with high spatial and temporal resolution and large field of view. Methods A multiecho pseudo‐golden angle stack‐of‐stars (SOS) sequence with k‐space weighted image contrast (KWIC) reconstruction was implemented to simultaneously measure multiple quantities, including temperature, initial signal magnitude M(0), transverse relaxation time ( T 2 * ), and water/fat images. Respiration artifacts were corrected using self‐navigation. KWIC artifacts were removed using a multi‐baseline library. The phases of the multiple echo images were combined to improve proton resonance frequency precision. Temperature precision was tested through in vivo breast imaging (N = 5 healthy volunteers) using both coronal and sagittal orientations and with focused ultrasound (FUS) heating in a pork phantom using a breast specific MR‐guided FUS system. Results Temperature measurement precision was significantly improved after echo combination when compared with the no echo combination case (spatial average of the standard deviation through time of 0.3–1.0 and 0.7–1.9°C, respectively). Temperature measurement accuracy during heating was comparable to a 3D seg‐EPI sequence. M(0) and T 2 * values showed temperature dependence during heating in pork adipose tissue. Conclusion A self‐navigated 3D multiecho SOS sequence with dynamic KWIC reconstruction is a promising thermometry method that provides multiple temperature sensitive quantitative values. Magn Reson Med 79:1407–1419, 2018. © 2017 International Society for Magnetic Resonance in Medicine.