@lifetraveler I looked to see if my Cancer Ctr. does PEM, but guess not. There are few out there. There is a clinical trial going on at Memorial Sloan Kettering: https://clinicaltrials.gov/study/NCT01864083 . And there is supposedly some use or former trial of PEM at Swedish Hospital in Seattle, but it looks like they mostly use PET/CT scans.
I found the NIH article you mention, but even though it says it can be helpful for those who struggle to use an MRI machine, the "PEM cannot provide the anatomical detail that is provided by MRI", & uses a lot of radiation. So it doesn't look like it's going to be as helpful as we'd hoped. Thanks for the info!