Journal of Northeastern University(Natural Science) ›› 2021, Vol. 42 ›› Issue (1): 147-152.DOI: 10.12068/j.issn.1005-3026.2021.01.022

• Biologic Engineering • Previous Articles    

A Method to Correct Stimulated Echo Artifact for Fast Spin Echo

WANG Yan-fei1, TAN Wen-jun2, YANG Jin-zhu2,3, KANG Yan1,4   

  1. 1. College of Medicine and Biomedical Information Engineering, Northeastern University, Shenyang 110169, China; 2. School of Computer Science & Engineering, Northeastern University, Shenyang 110169, China; 3. Key Laboratory of Intelligent Computing in Medical Image,Ministry of Education, Northeastern University, Shenyang 110169, China; 4. College of Health Science and Environmental Engineering, Shenzhen Technology University, Shenzhen 518118, China.
  • Online:2021-01-15 Published:2021-01-13
  • Contact: KANG Yan
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Abstract: The principle of fast spin echo (FSE) producing stimulated echo and the relationship between stimulated echo and the phase angle of radio frequency pulse were investigated. For fast spin echo pulse sequence, a stimulated echo artifact correction method was proposed. The spin echo and stimulated echo were separated by two times of excitations, then the area of dispersion gradient was adjusted to make the center of stimulated echo coincide with that of the spin echo, and the phase angle of 180° refocusing pulse was modified to make the phase of stimulated echo and spin echo consistent. The correction method was tested and validated on a 1.5T superconducting MRI scanner. After stimulated echo artifact was corrected, the signal to noise ratio of the FSE image was improved by 57.08%, while the image artifact was reduced by 76.12%. The experimental results showed that the proposed method can effectively suppress stimulated echo artifacts on FSE image and improve the image quality.

Key words: MRI(magnetic resonance imaging); FSE(fast spin echo); stimulated echo; radio frequency pulse; artifact correction

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