Improvement of Brain Contrast Using Spin Echo T<sub>1</sub>-weighted Image at 3 T MRI

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  • Matsushita Toshi
    Department of Radiology, Division of Medical Technology, Okayama University Hospital
  • Fujii Shunsuke
    Department of Radiology, Division of Medical Technology, Okayama University Hospital
  • Kurozumi Akira
    Department of Radiology, Division of Medical Technology, Okayama University Hospital
  • Nagano Akira
    Department of Radiology, Division of Medical Technology, Okayama University Hospital
  • Ichiba Yoshito
    Customer Service Division, Application Service Department, Siemens Healthcare K.K.
  • Ohno Seiichiro
    Department of Radiology, Division of Medical Technology, Okayama University Hospital
  • Tahara Seiji
    Department of Radiology, Division of Medical Technology, Okayama University Hospital

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Other Title
  • 3 T MRI における SE 法頭部 T<sub>1</sub> 強調画像のコントラスト改善
  • 臨床技術 3 T MRIにおけるSE法頭部T₁強調画像のコントラスト改善
  • リンショウ ギジュツ 3 T MRI ニ オケル SEホウ トウブ T ₁ キョウチョウ ガゾウ ノ コントラスト カイゼン

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<p>Brain T1-weighted images using spin echo (SE) sequence has poor contrast at 3.0 Tesla magnetic resonance imaging (3.0 T MRI) systems from the influence of crosstalk and magnetized transfer (MT) effect, and prolongation of the T1 value. Therefore, improving of scan parameters has been reported such as excitation flip angle (FA) and interleave data acquisition. The purpose of this study was to show the effects of alterations of presaturation pulse amplitude and chemical shift selective (CHESS) pulse amplitude. Gray-to-white matter contrast increased with decreasing amplitude of presaturation pulse in whole brain imaging. Presaturation and CHESS pulse consist of radio frequency pulse. Therefore, both pulses have a similar effect on MT pulse. Manual alteration of presaturation pulse amplitude for each scan lacks versatility on clinical use. However, decreasing amplitude of presaturation pulse is equal to decreasing thickness of presaturation pulse. About CHESS pulse, it requires no manual alteration for each scan. For example, switching fat suppression mode from strong to weak increase T1 contrast. Our study demonstrated that using not only low excitation FA and interleave date acquisition but also low amplitude of presaturation and CHESS pulse increase the contrast in T1 SE brain scans at 3.0 T MRI.</p>

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