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000288151 1001_ $$00000-0002-3829-4636$$aEisen, Christian Karl$$b0
000288151 245__ $$aFast online spectral-spatial pulse design for subject-specific fat saturation in cervical spine and foot imaging at 1.5 T.
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000288151 500__ $$a2024 Apr;37(2):257-272
000288151 520__ $$aTo compensate subject-specific field inhomogeneities and enhance fat pre-saturation with a fast online individual spectral-spatial (SPSP) single-channel pulse design.The RF shape is calculated online using subject-specific field maps and a predefined excitation k-space trajectory. Calculation acceleration options are explored to increase clinical viability. Four optimization configurations are compared to a standard Gaussian spectral selective pre-saturation pulse and to a Dixon acquisition using phantom and volunteer (N = 5) data at 1.5 T with a turbo spin echo (TSE) sequence. Measurements and simulations are conducted across various body parts and image orientations.Phantom measurements demonstrate up to a 3.5-fold reduction in residual fat signal compared to Gaussian fat saturation. In vivo evaluations show improvements up to sixfold for dorsal subcutaneous fat in sagittal cervical spine acquisitions. The versatility of the tailored trajectory is confirmed through sagittal foot/ankle, coronal, and transversal cervical spine experiments. Additional measurements indicate that excitation field (B1) information can be disregarded at 1.5 T. Acceleration methods reduce computation time to a few seconds.An individual pulse design that primarily compensates for main field (B0) inhomogeneities in fat pre-saturation is successfully implemented within an online 'push-button' workflow. Both fat saturation homogeneity and the level of suppression are improved.
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000288151 650_7 $$2Other$$a1.5 T MRI
000288151 650_7 $$2Other$$aDynamic RF pulses
000288151 650_7 $$2Other$$aDynamic transmission
000288151 650_7 $$2Other$$aFat saturation
000288151 650_7 $$2Other$$aPulse design
000288151 7001_ $$aLiebig, Patrick$$b1
000288151 7001_ $$aHerrler, Jürgen$$b2
000288151 7001_ $$aRitter, Dieter$$b3
000288151 7001_ $$aLévy, Simon$$b4
000288151 7001_ $$aUder, Michael$$b5
000288151 7001_ $$0P:(DE-He78)054fd7a5195b75b11fbdc5c360276011$$aNagel, Armin$$b6$$udkfz
000288151 7001_ $$aGrodzki, David$$b7
000288151 773__ $$0PERI:(DE-600)1502491-X$$a10.1007/s10334-024-01149-8$$n2$$p257-272$$tMagnetic resonance materials in physics, biology and medicine$$v37$$x0968-5243$$y2024
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