This invention provides a technique that, while providing safety and quantitativity, can continuously acquire magnetic resonance images at short repeat time intervals. Magnetic resonance signals are continuously acquired by applying excitation pulses at repeat time intervals of not more than 60 sec using a magnetic resonance contrast medium containing polyethylene glycol containing 13C in a higher proportion than natural abundance, or a compound labeled with the polyethylene glycol.本發明之目的在提供一種具備安全性及定量性,同時可於較短之重複時間內連續取得磁共振影像之技術。即,使用磁共振造影劑而於60秒以下之重複時間內施加激發磁場,連續取得磁共振訊號,該磁共振造影劑包含:以天然存在比以上之比例含有13C之聚乙二醇,或是該聚乙二醇所標記之化合物。
