The collection contains the records of the Radiologic Imaging Laboratory (RIL) of the University of California, San Francisco (UCSF) from its initial funding by Pfizer, Inc. through its operation as a unit of Diasonics, Inc. and Toshiba America MRI (TAMI). Material relates to the RIL's development and sale of medical imaging technology, including magnetic resonance imaging (MRI). The collection includes administrative and marketing material and the professional papers of lab members. Notable material related to the lab's research includes corporate correspondence, MRI machine designs and engineering drawings, system operation binders, photographs of early scans, machine prototype artifacts, and laboratory research notebooks. Material related to the lab’s administration and product marketing includes grant records, trade show slides and advertising brochures, marketing photographs and audiovisual recordings, large conference posters, and vendor and purchasing records. Restricted material in the collection includes court documents, patent records, and patient records.