Purpose A framework to design radiofrequency (RF) pulses specifically minimize the TR of gradient echo sequences is presented, subject hardware and physiological constraints. Methods Single-band multiband (MB) RF can be reduced in duration using variable-rate selective excitation (VERSE) VERSE for a range flip angles; however, minimum-duration do not guarantee minimum because these lead high sp...

Introduction. Quantitative imaging of the myelin water fraction (MWF) is able to show demyelinating processes and therefore provides insight into the pathology of white matter (WM) diseases such as multiple sclerosis. So far, mapping of the MWF most often was performed using single-slice multi-echo spin-echo sequences (1). Lately, a different approach, using multi-gradient-echo pulse sequences,...

PURPOSE We retrospectively compared the efficacy of 3-dimensional (3D) gradient-echo magnetic resonance T(1)-weighted sequence using the iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) technique with the efficacy of conventional 3D gradient-echo sequences for diagnosing ovarian masses at 3T. MATERIALS AND METHODS In images of 32 women (mean ag...

MRI is very sensitive to detect bone metastases. To improve specificity, a clever use of sequences, spin echo, gradient echo in or opposed phase, contrast medium and diffusion is needed.

BACKGROUND AND PURPOSE In multiple sclerosis, gadolinium enhancement is used to classify lesions as active. Regarding the need for a standardized and accurate method for detection of multiple sclerosis activity, we compared 2D-spin-echo with 3D-gradient-echo T1WI for the detection of gadolinium-enhancing MS lesions. MATERIALS AND METHODS Fifty-eight patients with MS were prospectively imaged ...

S. Köhler, J. Maier, K. Hiller, A. Haase, P. M. Jakob Physikalisches Institut, EP5, Wuerzburg, Germany Synopsis The purpose of the present study is to investigate the sensitivity of TrueFISP to mesoscopic field inhomogeneities and to analyse the effect of intravoxel dephasing in TrueFISP sequences compared to conventional gradient echo experiments. Numerical simulations on different off-resonan...

BACKGROUND AND PURPOSE Identifying occlusion location is crucial for determining the optimal therapeutic strategy during the acute phase of ischemic stroke. The purpose of this study was to assess the diagnostic efficacy of MR imaging, including conventional sequences plus time-resolved contrast-enhanced MRA in comparison with DSA for identifying arterial occlusion location. MATERIALS AND MET...