Motion compensated reconstruction for thoracoabdominal dynamic contrast-enhanced MRI in free-breathing
نویسندگان
چکیده
INTRODUCTION The analysis of abdominal and thoracic dynamic contrast-enhanced MRI is often impaired by motion-induced artifacts and misregistration, caused by physiological motion. Breath-holding is too short to cover these long acquisitions and suffers from imperfections. A previously published reconstruction algorithm, GRICS [1], corrects for motion-induced artifacts in a single image reconstruction. A novel method has been developed by modifying GRICS with the purpose of performing whole motion compensation in dynamic contrast-enhanced MRI. The main goal is to simplify post-processing and to improve the accuracy of time-intensity curves analysis. The performance is demonstrated on myocardial perfusion MRI, on 6 clinical examples and a simulated data set. THEORY Given in entry MRI raw data and physiological respiratory signals, GRICS [1] reconstructs the wanted image corrected for motion artifacts and yields in addition spatial distortion maps. The equations solved by GRICS are modified in order to include dynamic contrast enhancement: the true
منابع مشابه
Motion compensated reconstruction for free breathing dynamic constrast-enhanced MRI
INTRODUCTION: In contrast-enhanced MRI, medical diagnosis is often compromised by the motion, the need for registration and the difficulty of sustaining a breath-hold. A previously published motion correction algorithm GRICS (Generalized Reconstruction by Inversion of Coupled Systems) [1] has proven to correct for motion artefacts successfully in images acquired with a wide set of sequences, th...
متن کاملFree Breathing Dynamic Contrast Enhanced 3D MRI with Resolved Respiratory Motion
PURPOSE: Respiratory motion is a major issue in abdominal MRI, especially for pediatric patients who have difficulty performing breath-holds. The problem is exacerbated in lengthy scans, such as for dynamic contrast enhanced (DCE) MRI. Much of the previous work has been focused on reducing respiratory motion artifacts through reconstruction correction schemes. An alternative approach is resolvi...
متن کاملMotion Estimated-Compensated Reconstruction with Preserved-Features in Free-Breathing Cardiac MRI
To develop an efficient motion-compensated reconstruction technique for free-breathing cardiac magnetic resonance imaging (MRI) that allows high-quality images to be reconstructed from multiple undersampled single-shot acquisitions. The proposed method is a joint image reconstruction and motion correction meth-od consisting of several steps, including a non-rigid motion extraction and a motion-...
متن کاملFree-breathing dynamic magnetic resonance imaging of the abdomen
Abdominal magnetic resonance imaging (MRI) is complicated by tissue motion as well as by weak tissue contrast. The major source of motion is respiration, which can be dealt with by breath-hold imaging or by respiratory triggering. Nevertheless, these commonly used methods are known to have their limitations in terms of patient burden as well as in image quality. We propose a method that allows ...
متن کاملMotion compensated reconstruction from free breathing 2D radial cardiac MRI data
Background Cardiac magnetic resonance imaging (CMR) is affected by both cardiac and respiratory motion. While ECG-gated imaging within a breath hold is often the method of choice to limit motion-related artifacts, free-breathing methods are favorable in patients with limited breath hold capability. Free-breathing approaches require either rapid singleshot scans to reduce respiratory motion arti...
متن کامل