Simultaneous Multi-Slice Real-Time Imaging with Radial Multi-Band FLASH and Nonlinear Inverse Reconstruction
نویسندگان
چکیده
Simultaneous multi -s l ice (SMS) MRI al lows for the acquisi tion of several s l ices at the same time. We propose a novel reconstruction technique for radial SMS MRI based on Regularized Nonl inear Inversion (NLINV). This method does not require a priori knowledge of the coi l sensitivi ties. We present the simultaneous estimation of images and coi l sensitivi ties of two sl ices of a phantom from 10-fold undersampled data. Image qual i ty is analyzed for di fferent sampl ing schemes and compared to single-sl ice acquisi tions. Cl inical relevance is demonstrated by in-vivo imaging of two sl ices of a human heart in real time at a timeresolution of 30.8 ms per frame.
منابع مشابه
Simultaneous multi-slice MRI using cartesian and radial FLASH and regularized nonlinear inversion: SMS-NLINV.
PURPOSE The development of a calibrationless parallel imaging method for accelerated simultaneous multi-slice (SMS) MRI based on Regularized Nonlinear Inversion (NLINV), evaluated using Cartesian and radial fast low-angle shot (FLASH). THEORY AND METHODS NLINV is a parallel imaging method that jointly estimates image content and coil sensitivities using a Newton-type method with regularizatio...
متن کاملRadial simultaneous multi slice imaging for rapid cardiac imaging
Background It may be possible to more rapidly acquire cine, cardiac perfusion, and Late Gadolinium Enhancement (LGE) images for “free” with Simultaneous Multi-Slice (SMS) methods. With SMS imaging, multiple slices are simultaneously excited and acquired. Here we explore the application of an undersampled radial SMS approach termed Controlled Aliasing In Parallel Imaging results in higher accele...
متن کاملNonlinear inverse reconstruction for real-time MRI of the human heart using undersampled radial FLASH.
A previously proposed nonlinear inverse reconstruction for autocalibrated parallel imaging simultaneously estimates coil sensitivities and image content. This work exploits this property for real-time MRI, where coil sensitivities need to be dynamically adapted to the conditions generated by moving objects. The development comprises (i) an extension of the nonlinear inverse algorithm to non-Car...
متن کاملReal-time cardiovascular PC imaging using undersampled radial FLASH and nonlinear inverse reconstruction
Introduction: Velocity-encoded phase-contrast MRI is a well established method for quantitative mapping of flow velocities. Cardiac MRI studies commonly rely on ECG and respiration synchronized cine acquisitions of multiple heartbeats either in the state of free breathing or suspended respiration. This approach may be affected with temporal and/or spatial averaging of phase information obtained...
متن کاملHigh resolution real-time CMR of function and flow: initial clinical results
Methods A recently introduced real-time MRI method based on undersampled radial FLASH sequences with image reconstruction by regularized nonlinear inversion was applied to CMR. Anatomical imaging in real time was performed at 34 ms temporal resolution (30 fps) using 1.5 mm in-plane resolution and 6 mm slice thickness. Real-time quantitative flow measurements employed two acquisitions at 20 ms r...
متن کامل