Broadband heteronuclear decoupling

Jacobs, Jules; Os, J. W. M. van; Veeman, W. S.

doi:10.1016/0022-2364(83)90100-2

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…The time between the tip‐down and tip‐up excitations is given by the T 2 preparation time ( T E ). This type of T 2 preparation has been shown to be robust to B 0 and B 1 + inhomogeneities . After the preparation pulse, data are collected during a fixed‐duration scan window using a FISP‐based readout .…”

Section: Methodsmentioning

confidence: 99%

“…This type of T 2 preparation has been shown to be robust to B 0 and B 1 + inhomogeneities. [38][39][40] After the preparation pulse, data are collected during a fixed-duration scan window using a FISP-based readout. 41 There is an unbalanced gradient moment along the slice-select axis after each T R , which produces dephasing across the voxel but does not eliminate the transverse magnetization.…”

Section: Pulse Sequence and Data Samplingmentioning

confidence: 99%

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Simultaneous multislice cardiac magnetic resonance fingerprinting using low rank reconstruction

Hamilton

Jiang

et al. 2018

NMR in Biomedicine

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This study introduces a technique for simultaneous multislice (SMS) cardiac magnetic resonance fingerprinting (cMRF), which improves the slice coverage when quantifying myocardial T1, T2, and M0. The single‐slice cMRF pulse sequence was modified to use multiband (MB) RF pulses for SMS imaging. Different RF phase schedules were used to excite each slice, similar to POMP or CAIPIRINHA, which imparts tissues with a distinguishable and slice‐specific magnetization evolution over time. Because of the high net acceleration factor (R = 48 in plane combined with the slice acceleration), images were first reconstructed with a low rank technique before matching data to a dictionary of signal timecourses generated by a Bloch equation simulation. The proposed method was tested in simulations with a numerical relaxation phantom. Phantom and in vivo cardiac scans of 10 healthy volunteers were also performed at 3 T. With single‐slice acquisitions, the mean relaxation times obtained using the low rank cMRF reconstruction agree with reference values. The low rank method improves the precision in T1 and T2 for both single‐slice and SMS cMRF, and it enables the acquisition of maps with fewer artifacts when using SMS cMRF at higher MB factors. With this technique, in vivo cardiac maps were acquired from three slices simultaneously during a breathhold lasting 16 heartbeats. SMS cMRF improves the efficiency and slice coverage of myocardial T1 and T2 mapping compared with both single‐slice cMRF and conventional cardiac mapping sequences. Thus, this technique is a first step toward whole‐heart simultaneous T1 and T2 quantification with cMRF.

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Section: Methodsmentioning

confidence: 99%

Section: Pulse Sequence and Data Samplingmentioning

confidence: 99%

Simultaneous multislice cardiac magnetic resonance fingerprinting using low rank reconstruction

Hamilton

Jiang

et al. 2018

NMR in Biomedicine

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Moderne Pulsfolgen in der hochauflösenden NMR‐Spektroskopie

1983

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Modern Pulse Methods in High‐Resolution NMR Spectroscopy

Benn

Günther

1983

Angew. Chem. Int. Ed. Engl.

387

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The introduction of Fourier transform methods has not only remarkably enhanced the sensitivity of high‐resolution NMR spectroscopy, thus allowing measurements to be made on less sensitive nuclei of the Periodic Table, but also has paved the way for the development of a large number of new experimental techniques. On the one hand, procedures already known have been improved and can now be performed more rapidly, and, on the other, completely new experimental approaches have become available. This situation resulted mainly from the introduction of programmable pulse transmitters and the separation of the experiment into preparation, evolution, and detection. In particular, the concept of two‐dimensional spectroscopy has opened up new possibilities important for the analysis of complicated spectra and is able to provide information previously not accessible. As elsewhere, optimum application of the techniques and correct interpretation of the results require sound understanding of the underlying physical principles. Since a rigorous mathematical treatment is complicated and does not necessarily improve the comprehensibility, this article attempts to give an illustrative presentation of the new pulse techniques within the framework of the Bloch vector model. After a short introduction covering the basic principles, one‐dimensional pulse techniques that can be applied using standard experimental equipment are dealt with. The main areas of application are signal assignment, sensitivity enhancement for measurements on less abundant nuclei, and selective excitation of individual resonances. Subsequently, the various techniques of two‐dimensional NMR spectroscopy are treated: these enable shift correlations for different types of nuclei to be made, the presentation of spin multiplets without overlap, and the analysis of geometrical relations as well as of chemical exchange phenomena.

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Broadband heteronuclear decoupling

Cited by 9 publications

References 5 publications

Simultaneous multislice cardiac magnetic resonance fingerprinting using low rank reconstruction

Simultaneous multislice cardiac magnetic resonance fingerprinting using low rank reconstruction

Moderne Pulsfolgen in der hochauflösenden NMR‐Spektroskopie

Modern Pulse Methods in High‐Resolution NMR Spectroscopy

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