S.J. Riederer, D.G. Kruger, A.J. Madhuranthakam, H. Hu, and J.F. Glockner (USA)
Image Acquisition; Medical Imaging; Tracking
A method is presented for formation of a magnetic reso nance image of an arbitrarily long object. This is done by translating the object continuously through the magneti cally homogeneous volume of the MRI scanner, acquiring data throughout the table motion, and then accounting during the reconstruction for the relative displacement of the object for each measurement. Lateral spatial resolu tion is inversely proportional to the table velocity. The method can be used for 2D and 3D imaging. Results are demonstrated which show the need to correct for dis placement at the sub-pixel level of accuracy. If this is done there is no apparent degradation of image quality due to table motion. The method is applied to MR imag ing of the blood vessels of the abdomen, pelvis, and legs using the intravenous administration of contrast material. In this application there is a critical balance between ade quately high table velocity to track the moving contrast bolus and adequately low velocity to allow sufficient spa tial resolution. Real-time reconstruction allows the opera tor to dynamically track the flow of contrast material through the legs and in the future to potentially adjust the table velocity interactively.
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