the original web access to dicom® persistent objects (wado) standard was a joint effort by dicom® and an iso working group and was released in 2003 as dicom® supplement 85 and iso 17432. the word "persistent" in the name was later dropped. the iso standard has not been maintained as dicom® ps3.18 has evolved over time. the suffix "-uri" was later added to distinguish what is now called wado-uri from the newer services. wado-uri became popular for providing access to both original dicom® files and server side rendered versions of them, and accordingly was included in the ihe xds-i.b profile as one of its required transport mechanisms,