spatial-spectral pulses
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PURPOSE: To develop a fat-water imaging method that allows reliable separation of the two tissues, uses established robust reconstruction methods, and requires only one single-echo acquisition. THEORY AND METHODS: The proposed method uses spectrally selective dual-band excitation in combination with CAIPIRINHA to generate separate images of fat and water simultaneously. Spatially selective excitation without cross-contamination is made possible by the use of spatial-spectral pulses. Fat and water images can either be visualized separately, or the fat images can be corrected for chemical shift displacement and, in gradient echo imaging, for chemical shift-related phase discrepancy, and recombined with water images, generating fat-water images free of chemical shift effects. Gradient echo and turbo spin echo sequences were developed based on this Simultaneous Multiple Resonance Frequency imaging (SMURF) approach and their performance was assessed at 3Tesla in imaging of the knee, breasts, and abdomen. RESULTS: The proposed method generated well-separated fat and water images with minimal unaliasing artefacts or cross-excitation, evidenced by the near absence of water signal attributed to the fat image and vice versa. The separation achieved was similar to or better than that using separate acquisitions with water- and fat-saturation or Dixon methods. The recombined fat-water images provided similar image contrast to conventional images, but the chemical shift effects were eliminated. CONCLUSION: Simultaneous Multiple Resonance Frequency imaging is a robust fat-water imaging technique that offers a solution to imaging of body regions with significant amounts of fat.
... Relaxation -- Principles of magnetic resonance imaging -- Principles of magnetic resonance imaging -- Pulse ... ... of magnetic resonance imaging - 2, 39 -- 5.1 Frequency selective excitation, 39 -- 5.2 Composite pulses ... ... techniques, 56 -- 5.9 Phased-array coils, 58 -- 5.10 Parallel acquisition methods, 60 vi Contents -- 6 Pulse ... ... Extrinsic parameters, 89 -- 7.3 Parameter tradeoffs, 91 -- 8 Signal suppression techniques, 94 -- 8.1 Spatial ... ... spectroscopy, 162 -- 13.1 Additional concepts, 162 -- 13.2 Localization techniques, 167 -- 13.3 Spectral ...
Fifth edition xii, 232 stran : ilustrace, tabulky ; 25 cm
- Konspekt
- Patologie. Klinická medicína
- NLK Obory
- radiologie, nukleární medicína a zobrazovací metody
- NLK Publikační typ
- kolektivní monografie
... RF Field 41 -- 3.2.1 Polarization 42 -- 3.2.2 Quadrature 43 -- 3.3 Resonance Condition and the RF Pulse ... ... ^x\' 62 -- 4.5.2 Short-Lived RF Pulses 63 -- 4.5.3 Long-Lived RF Pulses 64 -- 5 The Quantum Mechanical ... ... Structures 126 -- 8.3.1 The FID Signal from Repeated RF Pulse Structures 127 -- 8.3.2 The Spin Echo ... ... Signal from Repeated RF Pulse Structures 129 -- 8.4 Inversion Recovery and Ti Measurements 131 -- 8.4.1 ... ... ID-Spectral Method 200 -- 10.5.2 A 3D-Spatial, ID-Spectral Method 204 -- 11 The Continuous and Discrete ...
Second edition xxxii, 944 stran : ilustrace ; 29 cm
- Konspekt
- Patologie. Klinická medicína
- NLK Obory
- radiologie, nukleární medicína a zobrazovací metody
- NLK Publikační typ
- kolektivní monografie
... editing and two-dimensional NMR -- Spectral quantification -- Hardware. ... ... 233 -- 5.1 Introduction 233 -- 5.2 Square RF Pulses 233 -- 5.3 Selective RF Pulses 239 -- 5.3.1 Sine ... ... Pulses 239 -- 5.3.2 Gaussian and Hermitian Pulses 243 -- 5.3.3 Multifrequency RF Pulses 246 -- 5.4 Pulse ... ... RF Pulses 255 -- 5.7 Adiabatic RF Pulses 258 -- 5.7.1 Rotating Frames of Reference 259 -- 5.7.2 Adiabatic ... ... RF Pulses 283 -- 5.11 Spectral-spatial RF Pulses 289 -- 5.12 Exercises 290 -- References 292 -- 6 Single ...
2nd ed. xxi, 570 s., [8] s. obr. příl. : il. ; 25 cm
... Zhou) 84 -- CHAPTER 4 -- Spectral Radiofrequency Pulses -- 4.1 Composite Radiofrequency Pulses (K.F. ... ... Bernstein) -- 4.3 Spectrally Selective Pulses (X J. ... ... Zhou) 115 -- CHAPTER 5 -- Spatial Radiofrequency Pulses -- 5.1 Multidimensional Pulses (M.A. ... ... Bernstein) 138 -- 5.3 Spatial Saturation Pulses (K.F. ... ... King) 148 -- 5.4 Spatial-Spectral Pulses (M.A. Bernstein) 153 -- 5.5 Tagging Pulses (XJ. ...
1st ed. xxii, 1017 s.
... Montazerolghaem (Iran) 14 -- Stabilization of C02 laser short pulse oscillation by tickle pulse for dot ... ... Starovoitov (Russia).130 -- Spectral and thermodynamic effects in pulsed RF excited C02 slab-waveguide ... ... Kudryashov (Russia).149 -- Pulse stretcher for chirped pulse amplification with a high power- and spectral ... ... Zhang (China) 181 -- Pulsed laser welding of cylindrical profiles -- R. Čtvrtlík, M. ... ... Tonisi (Italy) 190 -- Pulsed HF laser ablation of dentin -- E. Papagiakoumou, D. N. ...
1st ed. 209 s. ; 30 cm
1st ed. xxi, 508 s.
- MeSH
- nukleární magnetická rezonance biomolekulární MeSH
- Publikační typ
- monografie MeSH
- Konspekt
- Lékařské vědy. Lékařství
- NLK Obory
- radiologie, nukleární medicína a zobrazovací metody
