2021
DOI: 10.1002/mrm.28679
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Magnetization‐prepared GRASP MRI for rapid 3D T1 mapping and fat/water‐separated T1 mapping

Abstract: This study aimed to (i) develop Magnetization-Prepared Golden-angle RAdial Sparse Parallel (MP-GRASP) MRI using a stack-of-stars trajectory for rapid free-breathing T1 mapping and (ii) extend MP-GRASP to multi-echo acquisition (MP-Dixon-GRASP) for fat/water-separated (water-specific) T1 mapping. Methods: An adiabatic non-selective 180° inversion-recovery pulse was added to a gradient-echo-based golden-angle stack-of-stars sequence for magnetizationprepared 3D single-echo or 3D multi-echo acquisition. In combin… Show more

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Cited by 37 publications
(60 citation statements)
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References 72 publications
(150 reference statements)
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“…However, recent new reconstruction methods that use the high numbers of inversion points (like model-based or subspace) have the potential to reduce the differences in acquisition times between the 2 sequences. 50,51 Consequently, the CS-MP2RAGE sequence is a convincing tool within the panel of T 1 mapping sequences for the clinical MRI community. Another tremendously important feature is the intersubject variations of T 1 , which were extremely low in the current study, and thus may be beneficial for differentiating pathological from healthy tissue.…”
Section: Discussionmentioning
confidence: 99%
“…However, recent new reconstruction methods that use the high numbers of inversion points (like model-based or subspace) have the potential to reduce the differences in acquisition times between the 2 sequences. 50,51 Consequently, the CS-MP2RAGE sequence is a convincing tool within the panel of T 1 mapping sequences for the clinical MRI community. Another tremendously important feature is the intersubject variations of T 1 , which were extremely low in the current study, and thus may be beneficial for differentiating pathological from healthy tissue.…”
Section: Discussionmentioning
confidence: 99%
“…[𝐸 ' * 𝐸 ' ] 4,6 = 𝑍 2 𝐹 /0 𝑄 (4,6) 𝐹𝑍, (10) where 𝑄 (4,6) applies the k-space filter for that block. Equivalently, we can say that 𝐸 ' * 𝐸 ' (𝑌) = 𝑍 2 𝐹 /0 𝑊(𝐹𝑍𝑌), where 𝑊(⋅) right-multiplies an 𝐿 × 𝐿 kernel 𝑊 (9) with elements 𝑤 46 (9) = 𝑞 99 (4,6) at the nth of 2𝑁 : ⋅ 2𝑁 ; k-space locations.…”
Section: Non-cartesian Subspace Directly-solved DC Layer With Inverse...mentioning
confidence: 99%
“…The operator 𝐸 ' * 𝐸 ' + 𝜆𝐼 can be directly inverted by regularized inversion of each 𝐿 × 𝐿 kernel 𝑊 (9) , i.e., as:…”
Section: Non-cartesian Subspace Directly-solved DC Layer With Inverse...mentioning
confidence: 99%
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“…It consists of three repeated blocks: (1) non-selective inversion (2) a continuous radial FLASH readout using a tiny golden-angle (≈ 23.63 • ) [26] with a 3-s duration (3) and a time delay (T 1 recovery) before the inversion in the next repetition. In previous studies using multiple inversions [27,28], the delay time was set long enough to ensure a full recovery of longitudinal magnetization so that T 1 can still be calculated using the conventional Look-Locker formula [29,30]. However, a full recovery may need as long as 5 seconds for cardiac T 1 mapping, which prolongs the total acquisition time.…”
Section: Theory Sequence Design and T 1 Estimation From Incomplete Re...mentioning
confidence: 99%