Magnetic resonance imaging (MRI) is a new technique that affords anatomic images in multiple planes and may provide information on tissue characterization. This document describes how MR images are obtained and discusses how they differ from those produced by x-rays. The major portion of this report covers a conference held in October, 1987, which was designed to deal with safety and efficacy of the MRI method. The report provides evidence that was presented at the conference regarding the following questions: (1) are there contraindications to or risks of MRI? (2) what are the technological advantages and limitations (and disadvantages of MRI)? (3) what are the clinical indications for MRI, and how does it compare to other diagnostic modalities? and (4) what are the directions for future research in MRI? (TW)