Calculated T1 images derived from a partial saturation-inversion recovery pulse sequence with adiabatic fast passage.
作者： C.J. Hardy , W.A. Edelstein , D. Vatis , R. Harms , W.J. Adams
DOI: 10.1016/0730-725X(85)90247-4
关键词:
摘要: Calculated T1 images of the head and abdomen have been obtained using an alternating partial saturation-inversion recovery pulse sequence. Timing parameters were adjusted to yield optimum contrast-to-noise ratio for this sequence range studied. Adiabatic fast passage (AFP) was implemented nonselective inverting pulse, reduce sensitivity measurement RF static field inhomogeneity. A nonlinear frequency sweep used improve efficiency AFP pulse. The effect on calculation slice selection during pi/2 pulses also determined corrected in image reconstruction algorithm. T1's by method show a standard deviation less than 10%, good agreement with literature.
elsevier.com
sci-hub.se 参考文章(9)
G Johnson, T Redpath, W A Edelstein, J M S Hutchison, Spin warp NMR imaging and applications to human whole-body imaging. Physics in Medicine and Biology. ,vol. 25, pp. 751- 756 ,(1980) , 10.1088/0031-9155/25/4/017
J M S Hutchinson, W A Edelstein, G Johnson, A whole-body NMR imaging machine Journal of Physics E: Scientific Instruments. ,vol. 13, pp. 947- 955 ,(1980) , 10.1088/0022-3735/13/9/013
Paul A. Bottomley, Thomas H. Foster, Raymond E. Argersinger, Leah M. Pfeifer, A review of normal tissue hydrogen NMR relaxation times and relaxation mechanisms from 1-100 MHz: Dependence on tissue type, NMR frequency, temperature, species, excision, and age Medical Physics. ,vol. 11, pp. 425- 448 ,(1984) , 10.1118/1.595535
I L Pykett, P Mansfield, A line scan image study of a tumorous rat leg by NMR Physics in Medicine and Biology. ,vol. 23, pp. 961- 967 ,(1978) , 10.1088/0031-9155/23/5/012
Ray Freeman, Stewart P. Kempsell, Malcolm H. Levitt, Radiofrequency pulse sequences which compensate their own imperfections Journal of Magnetic Resonance. ,vol. 213, pp. 247- 273 ,(1980) , 10.1016/J.JMR.2011.08.032
Jeffrey L Evelhoch, Joseph J.H Ackerman, NMR T1 measurements in inhomogeneous B1 with surface coils Journal of Magnetic Resonance (1969). ,vol. 53, pp. 52- 64 ,(1983) , 10.1016/0022-2364(83)90069-0
I L Pykett, B R Rosen, F S Buonanno, T J Brady, Measurement of spin-lattice relaxation times in nuclear magnetic resonance imaging Physics in Medicine and Biology. ,vol. 28, pp. 723- 729 ,(1983) , 10.1088/0031-9155/28/6/012
W. A. Edelstein, P. A. Bottomley, H. R. Hart, L. S. Smith, Signal, Noise, and Contrast in Nuclear Magnetic Resonance (nmr) Imaging Journal of Computer Assisted Tomography. ,vol. 7, pp. 391- 401 ,(1983) , 10.1097/00004728-198306000-00001
I. R. Young, D. R. Bailes, M. Burl, A. G. Collins, D. T. Smith, M. J. McDonnell, J. S. Orr, L. M. Banks, G. M. Bydder, R. H. Greenspan, R. E. Steiner, Initial clinical evaluation of a whole body nuclear magnetic resonance (NMR) tomograph. Journal of Computer Assisted Tomography. ,vol. 6, pp. 1- 18 ,(1982) , 10.1097/00004728-198202000-00001