摘要
目的:开发一款能在摆脱硬件设备的情况下运行的核磁共振成像(MRI)虚拟培训软件,该软件可避免高级序列对硬件的高要求,避免实验数据采集时间过长及仪器台数不足等问题。方法:首先建立本征组织模型,为后序扫描工作提供虚拟受检样品;其次通过虚拟数据的动态采集,获得MRI数据;最后,通过傅里叶变换获得图像或频谱信息,供实践者培训实践MRI技术操作。结果:设计了一套MRI虚拟数据采集与图像重建软件,该软件避免了对硬件的高要求、部分实验数据采集时间过长以及台数不足等问题,在脱离硬件设备的运行环境下,获得与硬件成像教学仪相仿的实验效果。应用该软件可实现的教学实验有:莫尔频率测定、射频脉冲角度确定、电子匀场、自由感应衰减信号的频谱测量、7种常用序列的成像实验、各种序列的权重成像、采样参数对MRI图像形状影响、IR序列的脂肪抑制成像、IR序列的水抑制成像、反弹点成像、半傅里叶扫描技术、化学位移显示、一维编码成像、截断伪影、卷褶伪影等。结论:在实际MRI实践培训过程中,与硬件仪器相比,该MRI虚拟教学软件为学习者提供了一个更快速、高效的实验实训平台。
Objective To avoid the high requirement of advanced sequences on hardware, the problem of taking too much time on experimental data acquisition, and inadequate numbers of equipment by developing a kind of magnetic resonance imaging （MRI） virtual training software which can get rid of hardware equipment. Methods An intrinsic organization model was firstly established to provide a virtual sample for scanning. Secondly, the MRI data were obtained by the dynamic acquisition of virtual data. Finally, MRI images or spectrum information were obtained by Fourier transform to help trainer observe and practice the MRI operation. Results A set of MRI virtual data acquisition and image reconstruction software was designed to avoid the high requirement on hardware, the problem of taking too much time on experimental data acquisition, and inadequate numbers of equipment. Under the operation environment without hardware, the designed soRware achieved the same experimental effect with the hardware educational instrument. Many experimental items could be carded out by using the virtual software, such as Larmor frequency measurement, radio frequency flip angle adjusting, active shimming, free induction decay signal simulation and spectrum measurement, imaging experiment of seven imaging sequences, weighted imaging of different sequences, affection to imaging with different acquisition parameters, fat or water depression imaging with IR sequence, rebound point imaging, half Fourier acquisition imaging, chemical shift of small molecule, one-dimensional en- coding imaging, truncation artifact, aliasing artifacts and so on. Condusion Compared with hardware educational instrument, MRI virtual software provides a more rapid and efficient training platform for learners.
出处
《中国医学物理学杂志》
CSCD
2016年第10期1030-1037,共8页
Chinese Journal of Medical Physics
基金
科技部重大科学仪器专项(2013YQ170463)
关键词
虚拟软件
核磁共振成像
数据采集
图像重建
virtual software
magnetic resonance imaging
data acquisition
image reconstruction
