SNMMI Procedure Standard/EANM Practice Guideline for Estrogen Receptor Imaging of Patients with Breast Cancer Using 16?-[18F]Fluoro-17?-Estradiol PET Breast ER PET procedure guidelines – page 1 SNMMI Procedure Standard/EANM Practice Guideline for Estrogen Receptor Imaging of Patients with Breast Cancer Using 16α-[18F]Fluoro-17β-Estradiol PET David Mankoff1*, Sona Balogova2,3*, Lisa Dunnwald4 , Saint Louis, MO, USA 6University of Groningen, Groningen, Netherlands 7University of Padova, Padova, Italy 8Champalimaud Center for the Unknown, Champalimaud Foundation, Lisbon, Portugal 9Leiden University Medical Center, Leiden, Netherlands 10University of Wisconsin, Madison, WI, USA 11University of Washington, Seattle, WA, USA 12Hoag Family Cancer Institute, Newport Beach, CA, USA *Both