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Nonlinear Pharmacokinetics: Causes of Nonlinearity

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Best Current Practice for Obtaining High Quality EEG Data During Simultaneous fMRI

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パルスシーケンスを用いた非線形グラディエントハードウェアによる時空間エンコーディング：原理から実証まで

Andreas Holl¹, Frank Zijlstra², Maxim Zaitsev¹

¹Division of Medical Physics, Department of Diagnostic and Interventional Radiology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.

Magnetic resonance in medicine

|February 9, 2026

まとめ

この要約は機械生成です。

非線形グラディエントを用いた時空間エンコーディング（SPEN）は、新しいMRI法を提供する。このアプローチは、チャープRFパルスの制限を克服し、特に3Dおよび高磁場イメージングにおける臨床応用を改善する。

キーワード:

MRI Pulseq SPEN 非線形グラディエント二次位相時空間エンコーディング

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科学分野:

磁気共鳴画像法（MRI）
パルスシーケンス設計

背景:

時空間エンコーディング（SPEN）は高度なMRI技術です。
従来のSPEN法はチャープRFパルスに依存することが多く、制限が生じる可能性があります。

研究の目的:

非線形グラディエントハードウェアを用いたSPENの理論的根拠と実際の実証を提供すること。
新しいSPEN法と従来の技術を比較すること。

主な方法:

二次位相生成のためのカスタム構築されたマトリックスグラディエントコイルを用いた新しいSPEN法の実装。
Pulseqを用いたスピンエコーエコー平面イメージング（SE-EPI）シーケンスへの統合。
3T MRIシステムでのファントムイメージングによる従来のチャープRFパルス法との比較。

主要な成果:

非線形グラディエントを用いたSPEN定義二次位相プロファイルの生成に成功しました。
従来の方法と同等の画質を達成しました。
チャープRFパルスに関連する特定の吸収率（SAR）および最小エコー時間（TE）の制限を克服しました。

結論:

非線形グラディエントによるSPEN二次位相の生成は、従来の代替法よりも優れた代替法です。
この非線形グラディエントアプローチは、特に3Dおよび高磁場MRIにおけるSPENの臨床的有用性を高めます。
重要な安全性およびタイミングの問題を軽減し、より広範な採用への道を開きます。