Study of magnetization evolution by using composite spin-lock pulses for T₁ρ imaging

Yujia Li; Feng Zhao; Yi-Xiang Wang; Anil T Ahuja; Jing Yuan

doi:10.1109/EMBC.2012.6345954

Study of magnetization evolution by using composite spin-lock pulses for T₁ρ imaging

Annu Int Conf IEEE Eng Med Biol Soc. 2012:2012:408-11. doi: 10.1109/EMBC.2012.6345954.

Authors

Yujia Li¹, Feng Zhao, Yi-Xiang Wang, Anil T Ahuja, Jing Yuan

Affiliation

¹ Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong. yjli@cuhk.edu.hk

PMID: 23365915
DOI: 10.1109/EMBC.2012.6345954

Abstract

B(0) and B(1) field inhomogeneities may generate banding-like artifacts in T(1ρ)-weighted images and hence result in errors of T(1ρ) quantification. Several types of composite spin-lock pulses have been proposed to alleviate such artifacts. In this study, magnetization evolution with T(1ρ) and T(2ρ) relaxation by using these composite spin-lock pulses are theoretically derived. The effectiveness and limitation of each spin-lock pulse are explicitly illustrated in mathematical forms and phantom T(1ρ)-weighted images acquired by using each spin-lock pulse are presented. This study also provides a theoretical framework for T(1ρ) quantification from T(1ρ)-weighted images even with B(0) and B(1) inhomogeneity artifacts.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Humans
Image Processing, Computer-Assisted*
Magnetic Resonance Imaging / instrumentation
Magnetic Resonance Imaging / methods*
Models, Theoretical*
Phantoms, Imaging