Siemens Aktiengesellschaft

Siemens Healthcare Gmbh

Jing An

Thorsten Feiweier

Kecheng Liu

De He Weng

Qiong Zhang

Fang Dong

Tiejun Zhao

Zhi Guo Sun

YongMing Dai

In a method and magnetic resonance (MR) apparatus for heart diffusion imaging, when an ECG trigger signal by a computer that operates an MR scanner, the MR scanner is operated to acquire a navigator echo before a stimulated echo sequence, in order to detect diaphragm position information. When the first diaphragm position information is not located in an acquisition window, the stimulated echo sequence is not executed, and the computer waits to receive the next ECG trigger signal. The detection time of the navigator echo after the stimulated echo sequence as well as the acquisition time of the stimulated echo sequence, are thus eliminated when the first diaphragm position information does not meet requirements, so can significantly reduce scanning time, and increase the image SNR.

Stimulated echo sequence scanning magnetic resonance method and apparatus for heart diffusion imaging

In a magnetic resonance angiography method and apparatus, a time-of-flight sequence is used to acquire and enter k-space data, and a magnetic resonance angiography image is reconstructed from the k-space data. The time-of-flight sequence includes at least one saturation radio frequency pulse and multiple excitation radio frequency pulses. At least two of the excitation radio frequency pulses directly follow the saturation radio frequency pulse, and part of the k-space data is collected after each of the excitation pulses. Scanning time can thus be decreased, scanning efficiency can be improved, the electromagnetic absorption ratio can be reduced, and a venous magnetic resonance signal is still suppressed.

Magnetic resonance angiography method and apparatus

An apparatus and method for obtaining diffusion weighted magnetic resonance images (DW-MRI) is described. The properties of the diffusion tensor in tissue are measured by applying a diffusion weighting gradient oriented along a plurality of measurement axes. The value of the magnetic field is increased by using as many of the magnetic gradient coils as are effective in contributing the gradient field strength along the axis being. In regions where the magnetic field gradient is increased, the echo time (TE) may be decreased, increasing the signal-to-noise ratio of the measurements. Alternatively, the number of measurements than are averaged to achieve a particular image quality may be decreased, reducing the patient exposure time.

Method and apparatus for diffusion tensor magnetic resonance imaging

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Beijing, China

Jing An