ArticleMagnetic resonance in medicine2026
Consistent Quadratic Phase Formation in 3D Fast Spin Echo Using Frequency-Modulated RF Pulses.
Article in Magnetic resonance in medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeFrequency-modulated (FM) RF pulses achieve broadband excitation with low RF peak power, which is required in MRI with inhomogeneous magnetic fields. However, the quadratic phase generated with FM pulses makes it difficult to use them in fast spin echo (FSE), because even and odd refocused echoes have different spatial phase profiles. In this article, we formulate the condition that can generate a consistent quadratic phase in the two echo components in 3D FSE using FM pulses.
methodsThe consistent quadratic phase condition in 3D FM-FSE was formulated with the Cayley-Klein parameters. The B
resultsIn EPG simulation, a consistent quadratic phase was generated in all echoes in 3D FM-FSE under the formulated condition. The EPG simulation matched well with experimental results. The B
conclusionAchieving consistent quadratic phase in all refocused echoes in 3D FM-FSE makes it possible to use FM pulses in the non-adiabatic regime. 3D FM-FSE is a promising pulse sequence for MRI in inhomogeneous magnetic fields.
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