自旋回波序列扫描需要几分钟
时间: 2023-10-15 07:05:43 浏览: 37
The spin echo sequence scanning typically takes several minutes. However, the exact duration can vary depending on various factors such as the desired image resolution, the size of the scanning area, and the specific imaging parameters used.
In general, spin echo sequence scanning involves the excitation of nuclear magnetic resonance signals using a 90° radiofrequency pulse. This is followed by a period of signal evolution and the application of a 180° radiofrequency pulse to reverse the magnetization direction. After another period of signal evolution, the resulting signals are detected and processed to generate the desired image.
The total scanning time includes the time needed for signal evolution and the waiting time for magnetization reversal. The duration of these periods can be adjusted based on the specific imaging requirements and desired image quality.
It's worth noting that there are techniques available to accelerate MRI scans, such as parallel imaging and compressed sensing, which can reduce the scanning time while maintaining acceptable image quality. However, the actual duration of a spin echo sequence scan can vary depending on the specific MRI system and protocol used.