Title :
Elimination of T2 artifacts caused by RARE sequence in MRI
Author :
Takahashi, H. ; Ogawa, K. ; Oshio, K. ; Momoshima, H.
Author_Institution :
Dept. of Electr. Eng., Hosei Univ., Tokyo, Japan
fDate :
30 Oct-5 Nov 1994
Abstract :
Proposes a new method which removes artifacts due to T2 relaxation in Rapid Acquisition with Relaxation Enhancement (RARE) images. The method removes the artifacts by dividing the average of two Hermitian symmetric data, points in k-space by a hyperbolic cosine function prior to inverse Fourier transformation. In order to evaluate the effectiveness of the method, computer simulations were done in which T2 distribution was spatially variant. The results showed that the proposed method worked well for spatially variant T2 decay and was less sensitive to noise than the conventional method using the geometric mean of two symmetric points and that using an exponential filter. In addition, the method yielded good results for a wide range of T2 values
Keywords :
biomedical NMR; medical image processing; spin-spin relaxation; Hermitian symmetric data; MRI; RARE sequence; T2 artifacts elimination; computer simulations; exponential filter; hyperbolic cosine function; inverse Fourier transformation; k-space points; magnetic resonance imaging; medical diagnostic imaging; rapid acquisition with relaxation enhancement images; spatially variant T2 distribution; symmetric points; Data acquisition; Degradation; Educational institutions; Hospitals; Magnetic resonance imaging; Magnetization; Pulse generation; Radiology; Signal generators; Spatial resolution;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record
Conference_Location :
Norfolk, VA
Print_ISBN :
0-7803-2544-3
DOI :
10.1109/NSSMIC.1994.474582