Agripada police said Dr Siddhant Shah was arrested yesterday after the family of the 32-year-old victim, Rajesh Maru, told them that the radiologist was also present when the accident occurred.
Dr Shah was charged with dereliction of duty, police said, adding he was released on bail. Dr Shah's was the fourth arrest in the case.
Earlier, police had arrested three hospital staffers- Dr Saurabh Lanjekar, ward boy Vitthal Chavan and attendant Sunita Surve- for negligence causing death.
Metal objects are not allowed inside rooms having MRI machines.
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