A proposal of removal method for T2 decay effects in RARE sequence

Author

Takahashi, H. ; Ogawa, K. ; Oshio, K. ; Momoshima, H.

Author_Institution

Coll. of Eng., Hosei Univ., Koganei, Japan

Volume

42

Issue

4

fYear

1995

fDate

8/1/1995 12:00:00 AM

Firstpage

1343

Lastpage

1347

Abstract

This paper 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; image enhancement; Hermitian symmetric data points; RARE images; RARE sequence; Rapid Acquisition with Relaxation Enhancement images; T2 decay effects; T2 relaxation; artifact removal; computer simulations; exponential filter; hyperbolic cosine function; inverse Fourier transformation; k-space; noise sensitivity; spatially variant T2 distribution; Data acquisition; Degradation; Educational institutions; Hospitals; Magnetization; Proposals; Pulse generation; Radiology; Signal generators; Spatial resolution;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.467860

Filename

467860