Expansion of Sensitivity Area for Magnetic Resonance Imaging of the Hand Using Parallel-array Coil

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  • Takatsu Yasuo
    Department of Radiology, Osaka Red Cross Hospital Division of Health Sciences, Graduate School of Medical Science, Kanazawa University
  • Yamamura Kenichirou
    Division of Health Sciences, Graduate School of Medical Science, Kanazawa University Department of Radiology, Osaka Medical College Hospital
  • Miyati Tosiaki
    Division of Health Sciences, Graduate School of Medical Science, Kanazawa University
  • Kimura Tetsuya
    Department of Radiology, HIMEDIC Clinic West
  • Ueyama Tsuyoshi
    Department of Radiology, Saito Yukoukai Hospital
  • Ishikuro Akihiro
    Department of Radiology, Osaka Medical Center and Research Institute for Maternal and Child Health

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Other Title
  • 対向アレイコイルによる手部MRIの感度領域の拡張
  • 臨床技術 対向アレイコイルによる手部MRIの感度領域の拡張
  • リンショウ ギジュツ タイコウ アレイコイル ニ ヨル シュブ MRI ノ カンド リョウイキ ノ カクチョウ

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Abstract

It is difficult for Rheumatoid Arthritis (RA) patients to remain in a strenuous position for a long time during examinations. The field of view (FOV): 250 mm is needed for hand examinations from the wrist to the finger. Two channel phased array coils are effective to use when examinations of the ‘off center’ are taken for the upper and lower extremities. The area of the array coils’ sensitivity can be expanded by shifting both coil elements 40–60% in the opposite direction of the element’s diameter. This method is given credibility due to the increased signal-to-noise ratio (SNR) in the peripheral regions (shifted directions), but loses value in the central area, as indicated by the decrease in SNR. This was confirmed in the image of the hand using visual assessment including the fat suppression technique. It was verified that the sensitivity area was expanded using Scheffe’s method of paired comparison (Ura’s modified method). An application at the other regions of the body can be expected to be used in the case of using parallel positioned coils during clinical situation.

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