METHOD FOR CORRECTING PHASE AND SHADING OF NUCLEAR MAGNETIC RESONANCE IMAGE PICK-UP APPARATUS

摘要

PURPOSE:To attain to enhance the image quality of a re-constituted image, by simultaneously correcting the phase strain inherent to a system including even place dependent phase strain and concn. strain due to the sensitivity irregu larity of a receiving coil. CONSTITUTION:A correction phantom is arranged in a magnet assembly 1 and scanned so that actual scanning and a slice thickness or a slice position are made same while the obtained echo signal is subjected to two-dimensional Fourier inverse conversion and the image Cij of the result thereof is preliminarily preserved in a calculator in a state of a complex number. Next, an actual subject is measured in the same time and data processing is performed to obtain an image Oij. Correction is performed by the operation Sij=Oij/Cij of a complex number. At last, only the actual part of Sij is taken to obtain an image Pij according to Pij=Re[Sij].