Reduction of CSF artifacts on FLAIR images by using adiabatic inversion pulses.

The purpose of this study was to investigate the possibility that some artifactual high signals produced in CSF with fluid-attenuated inversion-recovery MR sequences could be due to inhomogeneity in the amplitude of the initial inversion pulse, and that this problem could be reduced or eliminated by the use of adiabatic inversion pulses. Studies with four volunteers showed dependence of high CSF signals in the posterior fossa on radiofrequency pulse amplitudes and that these signals could be eliminated by the use of adiabatic inversion pulses. Two illustrative clinical cases are included.

[1]  Glyn Johnson,et al.  A whole-body NMR imaging machine , 1980 .

[2]  M. S. Silver,et al.  Highly selective {π}/{2} and π pulse generation , 1984 .

[3]  W. Edelstein,et al.  Calculated T1 images derived from a partial saturation-inversion recovery pulse sequence with adiabatic fast passage. , 1985, Magnetic resonance imaging.

[4]  Alan R. Rath,et al.  Magnetic resonance imaging with adiabatic pulses using a single surface coil for RF transmission and signal detection , 1989, Magnetic resonance in medicine.

[5]  R. London,et al.  Quantitative determination of the partial oxygen pressure in the vitrectomized rabbit eye in Vivo using 19F NMR , 1991, Magnetic resonance in medicine.

[6]  H. Weinmann,et al.  A new lipophilic gadolinium chelate as a tissue‐specific contrast medium for MRI , 1991, Magnetic resonance in medicine.

[7]  C. Segebarth,et al.  Excitation characteristics of adiabatic half-passage RF pulses used in surface coil MR spectroscopy. Application to 13C detection of glycogen in the rat liver. , 1992, Physics in medicine and biology.

[8]  J V Hajnal,et al.  MR of the brain using fluid-attenuated inversion recovery (FLAIR) pulse sequences. , 1992, AJNR. American journal of neuroradiology.

[9]  J. Mugler,et al.  Csf‐suppressed t2‐weighted threel‐dimensional mp‐rage MR imaging , 1995, Journal of magnetic resonance imaging : JMRI.

[10]  Single‐shot, B1‐insensitive slice selection with a gradient‐modulated adiabatic pulse, BISS‐8 , 1996, Magnetic resonance in medicine.

[11]  J. Pauly,et al.  Background suppression with multiple inversion recovery nulling: Applications to projective angiography , 1997, Magnetic resonance in medicine.

[12]  G J Barker,et al.  3D fast FLAIR: a CSF-nulled 3D fast spin-echo pulse sequence. , 1998, Magnetic resonance imaging.

[13]  G. Barker,et al.  Optimisation of unenhanced MRI for detection of lesions in multiple sclerosis: a comparison of five pulse sequences with variable slice thickness , 1998, Neuroradiology.

[14]  R. Bakshi,et al.  Intraventricular CSF pulsation artifact on fast fluid-attenuated inversion-recovery MR images: analysis of 100 consecutive normal studies. , 2000, AJNR. American journal of neuroradiology.

[15]  M. Bock,et al.  Contrast optimization of fluid‐attenuated inversion‐recovery (FLAIR) MR imaging in patients with high CSF blood or protein content , 2000, Magnetic resonance in medicine.