Radiofrequency pulses for simultaneous short T2 excitation and long T2 suppression
نویسندگان
چکیده
منابع مشابه
Simultaneous Short T2 Excitation and Long T2 Suppression RF Pulses
Introduction: Ultrashort echo time (UTE) MRI requires specialized pulse sequences to overcome the short T2 relaxation of the MR signal encountered in tissues such as ligaments, tendon or cortical bone. Imaging short T2 tissues is achieved in UTE by acquiring the Free Induction Decay (FID) of the MR signal as soon after the end of the RF excitation pulse as possible. This is typically accomplish...
متن کاملDesigning long-T2 suppression pulses for ultrashort echo time imaging.
Ultrashort echo time (UTE) imaging has shown promise as a technique for imaging tissues with T2 values of a few milliseconds or less. These tissues, such as tendons, menisci, and cortical bone, are normally invisible in conventional magnetic resonance imaging techniques but have signal in UTE imaging. They are difficult to visualize because they are often obscured by tissues with longer T2 valu...
متن کاملUsing adiabatic inversion pulses for long-T2 suppression in ultrashort echo time (UTE) imaging.
Ultrashort echo time (UTE) imaging is a technique that can visualize tissues with sub-millisecond T(2) values that have little or no signal in conventional MRI techniques. The short-T(2) tissues, which include tendons, menisci, calcifications, and cortical bone, are often obscured by long-T(2) tissues. This paper introduces a new method of long-T(2) component suppression based on adiabatic inve...
متن کاملMR Spin Behavior During RF Pulses: T2 vs. T2' Relaxation
Introduction: We investigate the behavior of the MR magnetization vector during RF pulses in the presence of rapid transverse relaxation. The transverse relaxation is divided into two separate mechanisms: Homogeneously broadened lines which resulting in irreversible T2 amplitude decay, and inhomogeneously broadened lines resulting in dephasing and in principle refocusable T2’. While the two dif...
متن کاملNumerically optimized radiofrequency pulses for robust and low-power cardiovascular T2 preparation at 3T
Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland Figure 1 Performance of the tailored pulses. a) Example characteristics of the HS1-derived TR-FOCI pulse. Note that the optimized pulse is broad compared to the standard HS1 (dotted line). b) Slice-excitation profile of the same HS1-derived TR-FOCI pulse. Above a low pulse power of gB1≈200 Hz, the pro...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2010
ISSN: 0740-3194
DOI: 10.1002/mrm.22623