Motion compensation using principal component analysis and projection onto dipole fields for abdominal magnetic resonance thermometry

Abstract

The PCA-PDF hybrid method achieves superior artifact correction by exploiting the motion history and intrinsic magnetic susceptibility of the underlying tissue.

Correction of motion‐induced susceptibility artifacts and B0 drift during proton resonance frequency shift‐based MR thermometry in the pelvis with background field removal methods

“…Previous work employing PDF in the context of PRFS‐based MR thermometry was limited to a 2D slice to correct for motion‐induced susceptibility artifacts at constant temperature in humans as well as during MRgHIFU in a pig 16,17 . The anatomical target region was the abdomen, which is much more affected by respiratory motion than the herein investigated pelvic region.…”

“…Previous work employing PDF in the context of PRFSbased MR thermometry was limited to a 2D slice to correct for motion-induced susceptibility artifacts at constant temperature in humans as well as during MRgHIFU in a pig. 16,17 The anatomical target region was the abdomen, which is much more affected by respiratory motion than the herein investigated pelvic region. Even though the authors of the paper have noticed superiority of a 3D implementation of PDF over the 2D correction in an ex vivo tissue sample, the authors decided to continue with only the 2D implementation due to the requirement of a high temporal resolution at the presence of breathing-induced tissue displacement and field variations.…”

“…13 In the context of MR thermometry, projection onto dipole fields (PDF) 14 was already presented as a method to improve temperature accuracy in a phantom study. 15 It was also applied to correct for susceptibility artifacts in human PRFS-MR thermometry abdominal data at constant temperature, 16 as well as during liver ablation of a pig. 17 However, only a 2D slice was acquired, because the field changes and tissue displacement with breathing motion in the abdomen required a high temporal resolution.…”

“…15 It was also applied to correct for susceptibility artifacts in human PRFS-MR thermometry abdominal data at constant temperature, 16 as well as during liver ablation of a pig. 17 However, only a 2D slice was acquired, because the field changes and tissue displacement with breathing motion in the abdomen required a high temporal resolution. Among other background field removal (BFR) methods, solving the Laplacian boundary value (LBV) 18 has shown to perform best in the kernel-convolution-based BFR methods, 19 showing minimal artifacts in the internal field and no limitations compared to other BFR methods such as V-SHARP, 20 RESHARP, 21 or HARPERELLA.…”

Systematic review of pre-clinical and clinical devices for magnetic resonance-guided radiofrequency hyperthermia

“…Other MR parameters (T1 or T2) might be better suitable since these are less sensitive to motion, and motion correction techniques like gating could be applied. Note that many of these techniques are studied in the context of thermal ablation [89][90][91], but application for the range of 40-44 C still has to be studied. For all methods, increasing SNR is highly warranted since this allows for faster scanning and/or more accurate measurements.…”