MTR variations in normal adult brain structures using balanced steady-state free precession
نویسندگان
چکیده
منابع مشابه
Resting-State fMRI Using Passband Balanced Steady-State Free Precession
OBJECTIVE Resting-state functional MRI (rsfMRI) has been increasingly used for understanding brain functional architecture. To date, most rsfMRI studies have exploited blood oxygenation level-dependent (BOLD) contrast using gradient-echo (GE) echo planar imaging (EPI), which can suffer from image distortion and signal dropout due to magnetic susceptibility and inherent long echo time. In this s...
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A brief overview of the signal-to-noise ratio in MR imaging; including the sources of signal and noise and their respective parameters for optimization. In particular, the balanced SSFP sequence is presented as an example of a special type of gradient-echo (GE) sequence where the dephasing due to readout gradient is exactly zero. Thus b-SSFP yields a very high SNR, in some applications, by cont...
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Existing functional brain MR imaging methods detect neuronal activity only indirectly via a surrogate signal such as deoxyhemoglobin concentration in the vascular bed of cerebral parenchyma. It has been recently proposed that neuronal currents may be measurable directly using MRI (ncMRI). However, limited success has been reported in neuronal current detection studies that used standard gradien...
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Steady-state free precession (SSFP) is a highly-efficient MRI pulse sequence that has been a fairly recent arrival in the functional MRI realm. Several methods for using balanced SSFP to detect the BOLD signal have been proposed to date and will be discussed in this review. After a brief introduction to the general properties of SSFP, this review describes the quite different approaches of tran...
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An analysis of the effect of flow on 2D fully balanced steady state free precession (SSFP) imaging is presented. Transient and steady-state SSFP signal intensities in the presence of steady and pulsatile flow were simulated using a matrix formalism based on the Bloch equations. Various through-plane flow waveforms and rates were modeled numerically considering factors such as the excitation sli...
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ژورنال
عنوان ژورنال: Neuroradiology
سال: 2010
ISSN: 0028-3940,1432-1920
DOI: 10.1007/s00234-010-0714-5