Usefulness of the Principle of Selective Excitation Technique Non-electrocardiogramgated 3D-TOF Method in Lower-extremity MRA Using a Whole-body Coil

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  • Nakamura Yasunori
    Division of Radiology, Department of Medical Technology, Kyoto Prefectural University of Medicine, University Hospital
  • Nakagawa Toshiaki
    Division of Radiology, Department of Medical Technology, Kyoto Prefectural University of Medicine, University Hospital
  • Sakai Koji
    Department of Radiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine
  • Mizuta Masayoshi
    Department of Radiological Technology, Faculty of Medical Science, Kyoto College of Medical Science

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Other Title
  • Whole body coil を用いた下肢MRA における principle of selective excitation technique non-electrocardiogram-gated 3D-TOF 法の有用性の評価
  • 臨床技術 Whole body coilを用いた下肢MRAにおけるprinciple of selective excitation technique non-electrocardiogram-gated 3D-TOF法の有用性の評価
  • リンショウ ギジュツ Whole body coil オ モチイタ カシ MRA ニ オケル principle of selective excitation technique non-electrocardiogram-gated 3D-TOFホウ ノ ユウヨウセイ ノ ヒョウカ

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Abstract

<p>Purpose: Generally, non-contrast, lower-extremity, magnetic resonance angiography (MRA) uses electrocardiography; thus, examination is difficult in patients who exhibit arrhythmia. However, the use of electrocardiography can be avoided by using the selective excitation technique in non-electrocardiogram-gated three-dimensional time-of-flight (TOF) (pNon-Gate) MRA. Therefore, patients who exhibit arrhythmia can be examined with pNon-Gate MRA. The purpose of this study was to assess the usefulness of pNon-Gate MRA by using a whole-body coil. Methods: Images acquired using pNon-Gate MRA were compared with images acquired using electrocardiogram-gated two-dimensional TOF (Gate) MRA. Comparisons comprised visual evaluation, as well as comparisons of contrast-to-noise ratio and imaging time. Results: In visual evaluation of the pelvic region, Gate MRA showed better results than pNon-Gate MRA. In terms of contrast-to-noise ratio, there were no significant differences in either region. Imaging time showed no significant differences between the two methods. However, it exceeded 30 minutes frequently for Gate MRA, but rarely for pNon-Gate MRA. Conclusions: pNon-Gate MRA is useful in patients with frequent arrhythmia and in those with difficulty in maintaining long-term postures. By using a whole-body coil, pNon-Gate MRA enables easier patient positioning and setting. Therefore, pNon-Gate MRA can be used in routine examinations.</p>

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