The Department of Commerce, specifically the National Institute of Standards and Technology (NIST), is seeking proposals for the service and upgrade of two MRI system phantoms, which are critical for maintaining calibration properties in medical imaging research. The procurement includes the requirement for a 1K helium-4 sorption cooler that must deliver a minimum of 250uW of cooling for 24 hours, along with the replacement of specific arrays and validation of upgrades through imaging and measurement. This initiative underscores the importance of precision medical imaging tools in advancing research capabilities within the laboratory. Interested vendors should contact de Ionne Jones at deionne.jones@nist.gov for further details, with all service work expected to be completed within five months of order placement.