Purpose: To develop a self-gating method capable of assessing nonuniform motion, e.g., in cardiovascular magnetic resonance imaging of patients with severe arrhythmia, or for imaging of the temporomandibular joint.
Methods: The proposed method allows cyclic motion trajectories with a nonuniform pace by replacing the one-dimensional gating signal of conventional image-based self-gating with a two-dimensional gating matrix. The resulting image quality is compared with conventional self-gating and real-time MRI.
Results: Nonuniform self-gating resulted in superior image quality compared with conventional self-gating and the feasibility study showed significantly improved image sharpness (P < 0.01). Further, improvements in image quality were shown compared with golden angle radial parallel sparse MRI.
Conclusion: A new self-gating method was proposed that allows cardiovascular magnetic resonance of arrhythmic patients, which is a common problem in clinical practice. Further, the proposed method enables self-gated imaging of the temporomandibular joint. Magn Reson Med 76:919-925, 2016. © 2015 Wiley Periodicals, Inc.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/mrm.26000 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Self-gated free-running 5D whole-heart MRI using blind source separation for automated cardiac motion extraction.
Magn Reson Med
March 2025
Department of Diagnostic and Interventional Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland.
Article Synopsis
- The study aimed to evaluate the effectiveness of two blind source separation techniques (SOBI and ICA) against principal component analysis (PCA) for identifying cardiac triggers in 5D whole-heart MRI.
- Data was collected from three different groups: healthy volunteers, congenital heart disease patients, and patients with suspected coronary artery disease, each undergoing MRI scans with different protocols.
- Results showed SOBI provides more accurate and sharper cardiac triggers compared to PCA and ICA, demonstrating its reliability across varying patient conditions and noise levels.
High on sparsity: Interbin compensation of cardiac motion for improved assessment of left-ventricular function using 5D whole-heart MRI.
Magn Reson Med
March 2025
Department of Diagnostic and Interventional Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Vaud, Switzerland.
Article Synopsis
- Cardiac magnetic resonance imaging is crucial for assessing left-ventricular ejection fraction (LVEF), but its standard protocols can be time-consuming and challenging due to the need for significant operator and patient input.* -
- The proposed solution, FRF-MC, enhances data collection by incorporating interbin cardiac motion compensation, which improves both image quality and the accuracy of LVEF measurements while simplifying user-defined adjustments.* -
- Results from tests on both computer simulations and healthy participants show that FRF-MC surpasses the original method in image quality and LVEF precision, demonstrating significantly less blurring and better anatomical detail.*
Pulmonary Structural MRI using Free-Breathing, Self-Gated Ultra-short Echo Time Imaging.
J Vis Exp
September 2024
Division of Pulmonary, Critical Care, and Sleep Medicine, Hoglund Biomedical Imaging Center, University of Kansas Medical Center;
High quality MRI of the lungs is challenged by low tissue density, fast MRI signal relaxation, and respiratory and cardiac motion. For these reasons, structural imaging of the lungs is performed almost exclusively using Computed Tomography (CT). However, CT imaging delivers ionizing radiation, and thus is less well suited for certain vulnerable populations (e.
View Article and Find Full Text PDFAccelerated free-breathing liver fat and quantification using multi-echo stack-of-radial MRI with motion-resolved multidimensional regularized reconstruction: Initial retrospective evaluation.
Magn Reson Med
September 2024
MR R&D Collaborations, Siemens Medical Solutions USA, Inc, Austin, Texas, USA.
Article Synopsis
- The study aims to enhance the quality of MRI images and reduce biases in measuring liver fat content through a new method that allows for free-breathing scans instead of traditional breath-hold techniques.
- Researchers developed a multi-echo, radial MRI method using advanced compressed sensing and performed tests on motion phantoms and patients with liver disease to validate its effectiveness.
- Results showed that the new method significantly decreased measurement variations and required less scanning time compared to existing protocols, indicating it could be a more efficient approach for assessing liver health.
Correcting CT misregistration in data-driven gated (DDG) PET with PET self-gating and deformable image registration.
Med Phys
March 2024
Department of Imaging Physics, UT MD Anderson Cancer Center, Houston, Texas, USA.
Background: Misregistration between CT and PET data can result in mis-localization and inaccurate quantification of functional uptake in whole body PET/CT imaging. This problem is exacerbated when an abnormal inspiration occurs during the free-breathing helical CT (FB CT) used for attenuation correction of PET data. In data-driven gated (DDG) PET, the data selected for reconstruction is typically derived from the end-expiration (EE) phase of the breathing cycle, making this potential issue worse.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!