ArticleMagnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine2019
Improving the Quality of Diffusion-weighted Imaging of the Left Hepatic Lobe Using Weighted Averaging of Signals from Multiple Excitations.
Article in Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.
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17 citing papers in PubMed.
- Three-dimensional MRCP technique using a multi-planar voxel sequence combined with a precontrast pulse: improved image quality and robustness to respiratory motion.Abdominal radiology (New York) · 2026Article
- Adaptive Complex Signal Average Diffusion-Weighted MR Imaging of the Liver: Utility in Breath-Hold Imaging: A Retrospective Single-Center Study.Tomography (Ann Arbor, Mich.) · 2026Article
- Usefulness of Adaptive Complex Signal Average Diffusion-weighted MR Imaging of the Abdomen.Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine · 2026Article
- Optimized acquisition for simultaneous intravoxel incoherent motion and RMagnetic resonance in medicine · 2025Article
- Flow-Compensated vs. Monopolar Diffusion Encodings: Differences in Lesion Detectability Regarding Size and Position in Liver Diffusion-Weighted MRI.Tomography (Ann Arbor, Mich.) · 2025Article
- An online explainable ensemble machine learning model for predicting epidermal growth factor receptor mutation status in lung adenocarcinoma.Translational lung cancer research · 2025Article
- Reproducibility of liver ADC measurements using first moment optimized diffusion imaging.Magnetic resonance in medicine · 2025Article
- Reproducibility of intravoxel incoherent motion quantification in the liver across field strengths and gradient hardware.Magnetic resonance in medicine · 2024Article
- Precision of liver and pancreas apparent diffusion coefficients using motion-compensated gradient waveforms in DWI.Magnetic resonance imaging · 2024Article
- Feature-guided deep learning reduces signal loss and increases lesion CNR in diffusion-weighted imaging of the liver.Zeitschrift fur medizinische Physik · 2024Article
- Retrospective Motion Artifact Reduction by Spatial Scaling of Liver Diffusion-Weighted Images.Tomography (Ann Arbor, Mich.) · 2023Article
- Technical Advancements in Abdominal Diffusion-weighted Imaging.Magnetic resonance in medical sciences : MRMS : an official journal of Japan Society of Magnetic Resonance in Medicine · 2023Review
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- Mapping hepatocyte size in vivo using temporal diffusion spectroscopy MRI.Magnetic resonance in medicine · 2020Article
- Alternative approach of hepatocellular carcinoma surveillance: abbreviated MRI.Hepatoma research · 2020Article
- On the dependence of the cardiac motion artifact on the breathing cycle in liver diffusion-weighted imaging.PloS one · 2020Article
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7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundDiffusion-weighted imaging (DWI) is useful for detecting and characterizing liver lesions but is sensitive to organ motion artifact, especially in the left lobe. PURPOSE: To assess the signal intensity (SI) loss in the left hepatic lobe on DWI depending on motion-proving gradient (MPG) pulse direction (preliminary study) and to evaluate the usefulness of modified signal averaging to reduce the SI loss on DWI (application study).
methodsAbout 48 (preliminary) and 35 (application) patients were included. In the preliminary study, DWI with four different MPG directions, only a single MPG pulse direction (x-, y-, or z-axis) and all three directions combined (standard DWI), were reconstructed from the original data. In the application study, we examined the usefulness of the weighted averaging number of excitations (wNEX) method, in which a larger weighting factor is applied to the higher signal in pixel-by-pixel NEX signal averaging by comparing four reconstruction methods. We assumed that true signals would be the same in both lobes. The SI and apparent diffusion coefficient (ADC) ratios for the left versus right lobe were calculated by dividing the SI/ADC of the right lobe by that of the left lobe.
resultsIn the preliminary study, the SI ratio was significantly lower on DWI using only the x-axis but was significantly higher on DWI using only the z-axis (both P < 0.0001) when compared with standard DWI. In the application study, the SI (mean, 1.15-1.17) and ADC (0.90-0.92) ratios on DWI with wNEX were closer to 1.0 than those on standard DWI (SI ratio, 1.32-1.38; ADC ratio 0.80-0.81); the differences were significant (all P < 0.0001).
conclusionThe MPG pulse along the z-axis caused signal loss in the left hepatic lobe. The wNEX reconstruction method effectively reduced signal loss in the left lobe on DWI.
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