Image Contrast Enhancement using Selective Adiabatic Pulses that Alternate Frequency Sweep Directions
نویسندگان
چکیده
magnitude (Mxy/M0) generated by AFPSFS/AFS pulse trains as a function of RF offset Figure 2. Contrast generated by AFP-SFS/AFS pulse trains as a function of TE for the phantom. Figure 3. Phantom and mouse brain images collected using AFP-SFS-SE (A, C) and AFP-AFS-SE (B, D) pulse sequences at TE = 80 ms (A, B) and TE = 49 ms (C, D). Image Contrast Enhancement using Selective Adiabatic Pulses that Alternate Frequency Sweep Directions
منابع مشابه
Selective Adiabatic Refocusing Pulse Train for Nonlinear Phase Dispersion and Flip Angle Error Compensation
Introduction: Adiabatic full passage (AFP) pulses are well known for their immunity to the B1 inhomogeneity [1], and have been applied in many areas of magnetic resonance spectroscopy (MRS) and MRI, such as signal sensitivity enhancement and sharp volume boundary definition [2-4]. However, the application of selective AFP refocusing pulses has been limited by the inherent nonlinear phase disper...
متن کاملThe return of the frequency sweep: designing adiabatic pulses for contemporary NMR.
Frequency-modulated (FM) pulses that function according to adiabatic principles are becoming increasingly popular in many areas of NMR. Often adiabatic pulses can extend experimental capabilities and minimize annoying experimental imperfections. Here, adiabatic principles and some of the current methods used to create these pulses are considered. The classical adiabatic rapid passage, which is ...
متن کاملImproved 3D Spin-Echo Imaging Using Frequency-Swept Pulses
J-Y. Park, O. H. Gröhn, M. Garwood Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, MN, United States, A.I.Virtanen Institute for Molecular Sciences, University of Kuopio, Kuopio, Finland Introduction: Frequency-modulated (FM) pulses, including adiabatic full-passage (AFP) pulses, are sometimes preferred for selective refocusing in spin-e...
متن کاملRobust fat saturation applied to late enhancement
Background Late Gadolinium Enhancement (LGE) allows imaging of infarction and cardiomyopathies by measuring the accumulation of contrast agent within the myocardium. The shortened T1 relaxation time compared to healthy myocardium is imaged by an inversion recovery (IR) prepared segmented fast gradient echo sequence in which pathology and fat show as bright signal. The fat signal can lead to mis...
متن کاملPencil beam excitation using a 2D spatially selective adiabatic T2-prep for imaging the left coronary arterial system
Background 2D spatially selective radiofrequency (RF) pulses can be used to constrain the location from which an MR signal is obtained. This may lead to more time-efficient data collection by reducing the field of view (FoV) or may improve image quality by suppressing artefacts from outside the area of interest. Meanwhile, T2-Preparation, or T2-Prep, is a magnetization preparation scheme used t...
متن کامل