Simultaneous T1 and B1 + Mapping Using Reference Region Variable Flip Angle Imaging
نویسندگان
چکیده
منابع مشابه
Accurate and Efficient Mapping of Flip Angle and T1 using Simultaneous Actual Flip Angle - Variable Flip Angle Imaging (AFI-T1)
Introduction: The knowledge of flip angle values is essential for accurate modeling in many quantitative MRI techniques. Recently, Actual Flip Angle Imaging (AFI) was proposed to account for multiple sources of flip angle variations such as transmit field inhomogeneity, B0 variations, slab profile, and excitation pulse effects [1]. AFI was successfully applied to yield system-independent T1 rel...
متن کاملSpoiling properties of the VAFI method for fast simultaneous T1 and B1 mapping from actual flip-angle imaging (AFI) and variable flip-angle (VFA) data
ntroduction: Accurate measurements of both T1 and flip angle (FA) are important to many quantitative imaging applications. The use of steady-state sequences offers a fast way to acquire 3D volumetric maps of these parameters, and the recently proposed combined fitting of variable flip angle (VFA) [1] and actual flip-angle imaging (AFI) [2] data (VAFI) has been shown to be highly accurate and ef...
متن کاملWide-Range T1 Mapping Using Two Variable Flip Angle Acquisitions
Introduction: Volumetric T1 mapping using two variable flip angle (VFA) acquisitions has become a popular clinical tool for T1 estimation due to short scan times and ease of implementation. The conventional approach to flip angle selection has been based on maximization of the signaldynamic range (S-DR) product for a single T1 value of interest (typically ≤ 1000 ms), with estimation accuracy an...
متن کاملFlip-angle-optimized fast dynamic T1 mapping
Purpose: To analyze the flip-angle dependence and to optimize the statistical precision of a fast three-dimensional T1-mapping technique based on the variable-flip-angle (VFA) method. The proposed single-flip-angle (1FA) approach acquires only a single 3D spoiled gradient-echo data set for each time point of the dynamical series in combination with a longer baseline measurement. Theory and Meth...
متن کاملT₁ mapping using variable flip angle SPGR data with flip angle correction.
PURPOSE To improve the calculation of T1 relaxation time from a set of variable flip-angle (FA) spoiled gradient recalled echo images. MATERIALS AND METHODS The proposed method: (a) uses a uniform weighting of all FAs, (b) takes into account global inaccuracies in the generation of the prescribed FAs by estimating the actual FAs, and (c) incorporates data-driven local B1 inhomogeneity correct...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2013
ISSN: 0740-3194
DOI: 10.1002/mrm.24904