METHOD AND MAGNETIC RESONANCE APPARATUS FOR SPEED-COMPENSATED DIFFUSION-BASED DIFFUSION IMAGING

摘要

In a magnetic resonance imaging system and operating method for generating magnetic resonance image data of an object under examination, in order to acquire magnetic resonance raw data, an operating sequence is determined that has an excitation wherein an RF excitation pulse is radiated, and a readout procedure for receiving RF signals. In addition, a diffusion contrast gradient pulse sequence is generated that includes an uneven number of 2n+1 diffusion contrast gradient pulses switched in chronological succession, with the sum of the zero gradient moments of the diffusion contrast gradient pulses having the value zero and the sum of the first gradient moments of the diffusion contrast gradient pulses having the value zero. An RF refocusing pulse is switched between two of the diffusion contrast gradient pulses.

主权项

1. A method for operating a magnetic resonance (MR) data acquisition scanner of a magnetic resonance imaging apparatus comprising:
while an examination subject is situated in the MR data acquisition scanner, exciting nuclear spins in the subject by radiating a radio-frequency (RF) excitation pulse in the MR data acquisition scanner, and thereby causing said nuclear spins to emit RF signals; in a readout procedure that follows radiation of said RF excitation pulse, detecting said RF signals and subsequently converting the detected RF signals into MR raw data; between radiation of said RF excitation pulse and said readout procedure, effecting diffusion sensitization of said nuclear spins by operating said MR data acquisition scanner with a diffusion contrast gradient pulse sequence that comprises an uneven number of 2n+1 diffusion contrast gradient pulses that are activated in chronological succession, with a sum of respective zero gradient moments of the diffusion contrast gradient pulses having a value of zero and a sum of first gradient moments of said diffusion contrast gradient pulses having a value of zero, and radiating an RF refocusing pulse between two of said diffusion contrast gradient pulses; and in a computer, reconstructing image data of the examination subject from said raw MR data, and making the image data available from the computer in electronic form as a data file.