PURPOSE Clinical MRI patients typically experience elevated acoustic noise levels of 80-110 dB(A). In this study, standard clinical turbo spin echo (TSE) and gradient echo (GRE) sequences were optimized for reduced acoustic noise at preserved diagnostic image quality. METHODS The physical sources of acoustic noise generation in an MRI gradient coil were analyzed. A sequence conversion algorit...

Fig. 1: General scheme for spin echo based SER-EPI sequence: The standard SER-scheme is extended not only by the refocusing 180 RF-pulse but also by a gradient pulse in phase-encoding direction. This gradient prephasing pulse aligns the gradient echo with the spin echo of the first excitation pulse s1. Fig.2: k-space data of spin-echo based SER-EPI sequence: Phase-encode direction is top to bot...

background :inversion recovery (ir) pulse sequences can generate t1-weighted images with a different range of inversion time (ti) to suppress or null the signal intensity (si) for a specified tissue. in this study, we aimed to investigate the effect of ti values on the concentration of the contrast agent, which leads to a minimum signal intensity, using an inversion recovery t1-weighted 3-dimen...

Introduction: Among the different types of MS brain lesions observed by MRI, black holes are thought to be most associated with significant tissue destruction including axonal loss [1]. Black holes are usually detected as hypointense areas compared to the normal appearing white matter (NAWM) on T1-weighted (T1w) images generated by conventional turbo-spin-echo (SE) MRI sequences. Unfortunately,...

Background Exact quantification of aortic valve regurgitation is a challenge. Patients are typically asymptomatic and echocardiography is unreliable in certain conditions, particularly in eccentric regurgitation jets. Cardiac magnetic resonance (CMR) is a valuable alternative in this situation, but the use of conventional sequences without respiration correction is limited by motion artifacts a...

RF spoiling is a well established method to produce T(1)-weighted images with short repetition-time gradient-echo sequences, by eliminating coherent transverse magnetization with appropriate RF phase modulation. This paper presents 2 novel approaches to describe signal formation in such sequences. Both methods rely on the formulation of RF spoiling as a linear increase of the precession angle b...

BACKGROUND AND PURPOSE The T2-weighted gradient-echo (GRE) imaging is currently the gold standard MR imaging sequence for the evaluation of patients with cerebral cavernous malformation (CCM) lesions. We aimed to compare the sensitivity of susceptibility-weighted imaging (SWI) with T2-weighted fast spin-echo (FSE) and GRE imaging in assigning the number of CCM lesions in patients with the famil...

BACKGROUND We tested the value of magnetic resonance imaging (MRI) in the follow-up of patients with hypertrophic obstructive cardiomyopathy after septal artery embolization. MRI provides a noninvasive visualization of transplanar turbulent flow in order to quantify left ventricular outflow tract obstruction. METHODS AND RESULTS We followed 10 patients who were treated with septal artery embo...