Multi‐echo MR thermometry using iterative separation of baseline water and fat images

  title={Multi‐echo MR thermometry using iterative separation of baseline water and fat images},
  author={Megan E Poorman and Ieva Bra{\vs}kutė and Lambertus W. Bartels and William A. Grissom},
  journal={Magnetic Resonance in Medicine},
  pages={2385 - 2398}
To perform multi‐echo water/fat separated proton resonance frequency (PRF)‐shift temperature mapping. 
Interleaved water and fat MR thermometry for monitoring high intensity focused ultrasound ablation of bone lesions
To demonstrate that interleaved MR thermometry can monitor temperature in water and fat with adequate temporal resolution. This is relevant for high intensity focused uUltrasounds (HIFU) treatment of
Multi‐echo gradient‐recalled‐echo phase unwrapping using a Nyquist sampled virtual echo train in the presence of high‐field gradients
To develop a spatio‐temporal approach to accurately unwrap multi‐echo gradient‐recalled echo phase in the presence of high‐field gradients.
Phase‐independent thermometry by Z‐spectrum MR imaging
It is shown that Z-spectrum imaging can deliver reliable temperature change measurement in both muscular and fatty tissues and is therefore applicable in mixed tissues.
PRFS- Based MR Thermometry with Correction for Fat Interference
  • Hang Liu, G. Shen, Han Wang
  • Physics
    2019 12th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)
  • 2019
Results suggested the proposed geometric-model based method can compensate the deviation of measured temperature in fat phantoms and would be useful for applying PRFS-based thermometry in medium containing both fat and water.
A variable flip angle golden‐angle‐ordered 3D stack‐of‐radial MRI technique for simultaneous proton resonant frequency shift and T1‐based thermometry
A variable‐flip‐angle golden‐angle‐ordered 3D stack‐of‐radial MRI technique for simultaneous proton resonance frequency shift (PRF) and T1‐based thermometry in aqueous and adipose tissues, respectively is developed and evaluated.
Real-time interactive magnetic resonance (MR) temperature imaging in both aqueous and adipose tissues using cascaded deep neural networks for MR-guided focused ultrasound surgery (MRgFUS)
Real-time interactive HR MR temperature mapping for simultaneously measuring aqueous and adipose tissue is feasible by combining a cascaded convolutional neural network (CNN) framework and multi-echo gradient echo (meGRE) with a single reference variable flip angle (srVFA).
MR Thermometry Accuracy and Prospective Imaging-Based Patient Selection in MR-Guided Hyperthermia Treatment for Locally Advanced Cervical Cancer
This study presents the first systematic analysis and defines an imaging-based criterion for prospective patient selection to standardize clinical MR thermometer accuracy assessments and found that gastrointestinal air motion at the start of the treatment, quantified by the Jaccard similarity coefficient, was a good predictor for MR thermometry accuracy.
Learning Multiparametric Biomarkers for Assessing MR-Guided Focused Ultrasound Treatment of Malignant Tumors
A novel, noncontrast, learned multiparametric MR biomarker that can be used during treatment for intratreatment assessment, validated in a VX2 rabbit tumor model is presented.
Recent Technological Advancements in Thermometry.
Validating a Simulation Model for Laser-Induced Thermotherapy Using MR Thermometry
Laser-induced interstitial thermotherapy (LITT) is applied to ex-vivo porcine livers. An artificial blood vessel is used to study the cooling effect of larger blood vessels in proximity to the ablation


Fat‐referenced MR thermometry in the breast and prostate using IDEAL
A three‐echo fat‐referenced MR thermometry technique that estimates and corrects for time‐varying phase disturbances in heterogeneous tissues is demonstrated.
Respiration artifact correction in three‐dimensional proton resonance frequency MR thermometry using phase navigators
To develop reliable three‐dimensional (3D) segmented echo planar imaging (seg‐EPI) proton resonance frequency (PRF) temperature monitoring in the presence of respiration‐induced B0 variation.
Interleaved echo‐planar imaging for fast multiplanar magnetic resonance temperature imaging of ultrasound thermal ablation therapy
To develop a multiplanar magnetic resonance temperature imaging (MRTI) technique based on interleaved gradient‐echo echo‐planar imaging (EPI), verify in phantom, and demonstrate feasibility to monitor ultrasound thermal ablation therapy in vivo.
Multiecho pseudo‐golden angle stack of stars thermometry with high spatial and temporal resolution using k‐space weighted image contrast
Implement and evaluate a 3D MRI method to measure temperature changes with high spatial and temporal resolution and large field of view and evaluate its application to 3D magnetic resonance imaging.
Fast lipid‐suppressed MR temperature mapping with echo‐shifted gradient‐echo imaging and spectral‐spatial excitation
The efficacy of echo‐shifted (TE > TR) gradient‐echo imaging with spectral‐spatial excitation is demonstrated, resulting in accurate and rapid, lipid‐suppressed, MR thermometry, demonstrating improvements in both the speed and precision of temperature mapping.
Noninvasive temperature mapping with MRI using chemical shift water‐fat separation
An image acquisition and postprocessing method, called water and fat thermal MRI, is demonstrated in phantoms containing 30:70, 50:50, and 70:30 water‐to‐fat by volume, using a miniannular phased radiofrequency array.
Triggered, navigated, multi‐baseline method for proton resonance frequency temperature mapping with respiratory motion
Laser ablations were performed in an ex vivo liver phantom undergoing variable simulated respiratory motion and in vivo in four porcine livers, demonstrating a reduction of artifacts in the computed temperature maps compared with conventional single baseline techniques, both uncorrected and corrected for motion.
Addressing phase errors in fat‐water imaging using a mixed magnitude/complex fitting method
Mixed fitting is demonstrated to be able to provide accurate fat fraction measurements with high signal‐to‐noise ratio and low bias over a wide choice of echo combinations, particularly for certain choices of echo time combinations.
Multicoil Dixon chemical species separation with an iterative least‐squares estimation method
This work describes a new approach to multipoint Dixon fat–water separation that is amenable to pulse sequences that require short echo time increments, such as steady‐state free precession (SSFP) and fast spin‐echo (FSE) imaging, and extends to multicoil reconstruction with minimal additional complexity.
Three‐dimensional water/fat separation and T  2* estimation based on whole‐image optimization—Application in breathhold liver imaging at 1.5 T
This work describes an automatic method that produces separate water and fat images as well as quantitative maps of fat signal fraction and T  2* from complex multiecho gradient‐recalled datasets.