#$%^&*AU2013224685A120130926.pdf#####ABSTRACT An object of the invention is to provide a technique that is safe and quantitative, and is capable of continuously acquiring a magnetic resonance image with a short repetition time. 5 A magnetic resonance contrast agent comprising a polyethylene glycol containing 13C in a proportion higher than the natural abundance, or a compound labeled with the polyethylene glycol, is used to continuously acquire magnetic resonance signals by applying excitation pulses with a repetition 10 time of 60 seconds or less.