Universität zu Köln

Ferrer, Cyril J., Bartels, Lambertus W., van der Velden, Fiji A., Gruell, Holger, Heijman, Edwin, Moonen, Chrit T. W. and Bos, Clemens (2020). Field drift correction of proton resonance frequency shift temperature mapping with multichannel fast alternating nonselective free induction decay readouts. Magn. Reson. Med., 83 (3). S. 962 - 974. HOBOKEN: WILEY. ISSN 1522-2594

Full text not available from this repository.

Abstract

Purpose To demonstrate that proton resonance frequency shift MR thermometry (PRFS-MRT) acquisition with nonselective free induction decay (FID), combined with coil sensitivity profiles, allows spatially resolved B-0 drift-corrected thermometry. Methods Phantom experiments were performed at 1.5T and 3T. Acquisition of PRFS-MRT and FID were performed during MR-guided high-intensity focused ultrasound heating. The phase of the FIDs was used to estimate the change in angular frequency delta omega(drift) per coil element. Two correction methods were investigated: (1) using the average delta omega(drift) over all coil elements (0th-order) and (2) using coil sensitivity profiles for spatially resolved correction. Optical probes were used for independent temperature verification. In-vivo feasibility of the methods was evaluated in the leg of 1 healthy volunteer at 1.5T. Results In 30 minutes, B-0 drift led to an apparent temperature change of up to -18 degrees C and -98 degrees C at 1.5T and 3T, respectively. In the sonicated area, both corrections had a median error of 0.19 degrees C at 1.5T and -0.54 degrees C at 3T. At 1.5T, the measured median error with respect to the optical probe was -1.28 degrees C with the 0th-order correction and improved to 0.43 degrees C with the spatially resolved correction. In vivo, without correction the spatiotemporal median of the apparent temperature was at -4.3 degrees C and interquartile range (IQR) of 9.31 degrees C. The 0th-order correction had a median of 0.75 degrees C and IQR of 0.96 degrees C. The spatially resolved method had the lowest median at 0.33 degrees C and IQR of 0.80 degrees C. Conclusion FID phase information from individual receive coil elements allows spatially resolved B-0 drift correction in PRFS-based MRT.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ferrer, Cyril J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bartels, Lambertus W. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Velden, Fiji A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gruell, Holger UNSPECIFIED UNSPECIFIED UNSPECIFIED Heijman, Edwin UNSPECIFIED UNSPECIFIED UNSPECIFIED Moonen, Chrit T. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bos, Clemens UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-141086
DOI:	10.1002/mrm.27985
Journal or Publication Title:	Magn. Reson. Med.
Volume:	83
Number:	3
Page Range:	S. 962 - 974
Date:	2020
Publisher:	WILEY
Place of Publication:	HOBOKEN
ISSN:	1522-2594
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INTENSITY FOCUSED ULTRASOUND; MR-THERMOMETRY; CHEMICAL-SHIFT; REFERENCELESS; HYPERTHERMIA; DISTURBANCES; ABLATION Multiple languages Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14108