Magnetic susceptibility of materials that are used for body implants causes much distortion in MR images. This paper deals with mapping the magnetic field induction in the vicinity of these materials. A modified spin-echo method is used, in which via inserting a time interval of a defined length the range of phase modulation is reduced below the value 2π. Even with a large B0 inhomogeneity it is not necessary to unwrap the phase jumps. The method is suitable for studying the effects of body-implant materials on MR images and for measuring their magnetic susceptibility.
The equilibrium between the solid and gas phases has been studied, using the flow method. The pressure varied from 1.3 atm up to 50 atm. The composition of the gas phase has been determined by means of the solidification of N 2 (or CO) with the aid of liquid hydrogen. The most favourable conditions for the purification of hydrogen were deduced from the experimental results with respect to the binary mixtures H 2 -="2 and H 2 -CO . The agreement between theory and experiments proved to be satisfactory. The behaviour of the ternary mixture H 2 -N 2 -CO is shown in the corresponding diagrams.
The paper deals with measuring magnetic induction by imaging techniques based on magnetic resonance (MR). It describes experimental results of mapping the magnetic induction of helical and toroidal coils performed by modified MR imaging techniques. The results are compared with the theoretical calculation and with the measurement carried out using an ordinary magnetometer. The conclusions derived from the measurement will be used in the design of a new type of coil with complex electronic control of the magnetic field.
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