Dear skthom
No, such a function is not available in K-PACS. Usually, you won't know what kind of pixel spacing you have with non-DICOM images that you import. The only option is to calibrate such images later in the viewer. This is possible in iQ-VIEW (not K-PACS). If you have a marker of known size on such an image, you can use this marker to calibrate this image and iQ-VIEW will calculate all distance measurements based on this calibration. With the PRO version of iQ-VIEW you would even be able to store these changes as a presentation state object (PR).
Feel free to try out iQ-VIEW, our diagnostic workstation, which comes with a lot more features and also medical device certification, such as CE and FDA 510(k) among others.
I hope this helps.