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| 2. |
- Weis, J, et al.
(författare)
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Gradient amplifier imperfections in NMR imaging.
- 1992
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Ingår i: Magnetic Resonance Imaging. - 0730-725X .- 1873-5894. ; 10:3, s. 461-4
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes the influence of the transition distortion of gradient amplifiers on direct Fourier NMR imaging techniques. We demonstrate artifacts arising in the real measurement of the spin density images. Image artifacts are compared with artifacts obtained by computer simulations of the transition distortion of gradient amplifiers.
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| 3. |
- Weis, J, et al.
(författare)
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Measurement of magnetic susceptibility and MR contrast agent concentration
- 1994
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Ingår i: Magnetic Resonance Imaging. - 0730-725X .- 1873-5894. ; 12:6, s. 859-864
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Tidskriftsartikel (refereegranskat)abstract
- This paper describes an MR imaging method for determining magnetic susceptibility constants of solutions containing paramagnetic contrast agents. The method's validity is demonstrated on Gd(DTPA) and Dy(DTPA) water solutions. The method can be used for measurement of the volume magnetic susceptibility or concentration of contrast agents in biological tissues.
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| 4. |
- Weis, J, et al.
(författare)
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Simulation of the influence of magnetic field inhomogeneity and distortion correction in MR imaging.
- 1990
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Ingår i: Magnetic Resonance Imaging. - 0730-725X .- 1873-5894. ; 8:4, s. 483-9
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Tidskriftsartikel (refereegranskat)abstract
- We describe a technique for simulation and correction of the effects of an arbitrary distribution of undesired components of the static and gradient magnetic fields. This technique is applicable to direct Fourier NMR imaging. The mathematical basis and details of this technique are fully described. Computer simulation demonstrates the effectiveness of this method.
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