Parallel Imaging with Simultaneous Multiple Slice RF Pulse Excitation
Date Issued
2004
Date
2004
Author(s)
Yeh, Chun-Chieh
DOI
zh-TW
Abstract
Abstract
Keywords： Simultaneous Multi Slice RF pulse Excitation；
Ultrafast MRI；Parallel Imaging
MRI (Magnetic Resonance Imaging) has been used in clinical diagnosis and scientific research because of its non-invasive and variety of tissue contrast mechanism . In order to get dynamic image in real time, temporal resolution should be improved . So it is important to break through the present speed limitation of magnetic resonance.
Our research focus on the development of Simultaneous Multi Slice RF pulse Excitation to raise the frequency band efficiency and combined with sensitivity encoding.
Simultaneous Multi Slice RF pulse Excitation and mixed slices separation has been verified on phantom and fruit.We also use multicoil arrays for separation of signal from multiple slices simultaneously excited;Tikhonov regularization was introduced to mitigate the noise amplification in SENSE reconstruction.
The result of our study established on NTUEE Bruker 3T,we use body coil to excite duoslice RF pulse and received by two channel cardiac phased array.The temporal resolution was improved four times.
With high temperature superconductive coil array,eddy current compensation,spiral pulse sequence and optimized scanning parameter,we expect to enhance one order of MRI acquisition. Futhermore, this result is applied on micro-image, and genome image.
Subjects
多截面射頻脈衝激發
平行磁振成像
Parallel Imaging
Simultaneous Multi Slice RF pulse Excitation
Ultrafast MRI
Type
thesis