Correction of Geometrical Distortions in MR-images

摘要: In MR-Fourier Imaging three different types of magnetic fields are used: a homogeneous main field, linear and orthogonal gradient fields, radiofrequency (RF) field. If these deviate from their ideal configurations, artifacts disturbances in the MR-images will occur. An inhomogeneous RF-field leads to intensity variations MR-images. Inhomogeneities field spatial nonlinearity gradients introduce geometrical image distortions. Although distortions often not obvious clinical images, it might be necessary do distortion correction order get precise information image. Precise about tumors other lesions is very important for stereotaxis future role MR-imaging nuclear therapy planning.