PHANTOM OF NMR MACHINE AND METHOD FOR MEASURING THE CHARACTERISTICS OF A MAGNETIC FIELD USING SUCH A PHANTOM

摘要

the phantom (16 to 24) has the characteristic of being formed of an assembly of tubes (22) with resonant material in the experiment, nmr, and positioned at predetermined locations (18).it is shown that by placing the phantom inside an nmr imaging device (1), in which the image (9), (15) and comparing the image obtained in an image), we can deduce the orientation of the field inhomogeneities of the machine on the one hand, and the inhomogu00e9nu00e9i (29) of the magnetic field gradients, which are image processing, on the other hand.we will use the information to measure the inhomogeneity of the field orientation in the means (12, 14) for correcting the uniformity of the field.