3.0T MRI 装置を用いた 3D Double IR FSPGR 法による血液のアーチファクトの低減

• Published in: 日本放射線技術学会雑誌 Vol. 63; no. 11; pp. 1239 - 1245
• Main Authors: 松田, 豪, 林, 弘之, 山口, 功, 大谷, 友梨子, 石森, 佳幸, 大越, 優祐, 木村, 浩彦, 宮地, 利明, 藤原, 康博
• Format: Journal Article
• Language: Japanese
• Published: 公益社団法人 日本放射線技術学会 20.11.2007
• Subjects: 3.0 Tesla; magnetic resonance (MR); three-dimensional fast spoiled gradient recalled acquisition in the steady state (3D IR FSPGR); vascular
• ISSN: 0369-4305; 1881-4883
• DOI: 10.6009/jjrt.63.1239

The purpose of this study was to decrease vascular artifacts caused by the in-flow effect in three-dimensional inversion recovery prepared fast spoiled gradient recalled acquisition in the steady state (3D IR FSPGR) at 3.0 Tesla. We developed 3D double IR FSPGR and investigated the signal characteristics of the new sequence. The 3D double IR FSPGR sequence uses two inversion pulses, the first for obtaining tissue contrast and the second for nulling vascular signal, which is applied at the time of the first IR period at the neck region. We have optimized scan parameters based on both phantom and in-vivo study. As a result, optimized parameters (1st TI=700 ms, 2nd TI=400 ms) successfully have produced much less vessel signal at reduction than conventional 3D IR FSPGR over a wide imaging range, while preserving the signal-to-noise ratio (SNR) and gray/white matter contrast. Moreover, the decreased artifact was also confirmed by visual inspection of the images obtained in vivo using those parameters. Thus, 3D double IR FSPGR was a useful sequence for the acquisition of T1-weighted images at 3.0 Tesla.