Characterization of 18F-Fluciclovine PET Amino Acid Radiotracer in Resected Brain Metastasis

Inclusion Criteria: 1. Age ≥ 18 years 2. Performance status, Eastern Cooperative Oncology Group (ECOG) 0-3 3. Radiographic diagnosis of brain metastasis 4. Patient planned for surgical intervention for at least 1 metastasis 5. Patient planned for postoperative SRS Male or female patients of reproductive potential need to employ two highly effective and acceptable forms of contraception for at least 4 weeks prior to screening and agreement to use such a method during study participation and for an additional 1 week after post-treatment 18F-Fluciclovine PET/CT. Highly effective and acceptable forms of contraception are: * Male condom plus spermicide * Cap plus spermicide * Diaphragm plus spermicide * Copper T * Progesterone T * Levonorgestrel-releasing intrauterine system (e.g., Mirena®) * Implants * Hormone shot or injection * Combined pill * Mini-pill * Patch Postmenopausal people on the study (that will not need contraception) is defined as at least one of the following: * Amenorrhoeic for 1 year or more following cessation of exogenous hormonal treatments * Luteinizing hormone (LH) and follicle stimulating hormone (FSH) levels in the postmenopausal range for women under 50 * Radiation-induced oophorectomy with last menses \> 1 year ago * Chemotherapy-induced menopause with \>1 year interval since last menses * Surgical sterilization (bilateral oophorectomy or hysterectomy). Exclusion Criteria: 1. Prior anaphylactic reaction to 18F-Fluciclovine 2. Evidence of leptomeningeal disease 3. Prior whole-brain radiation therapy 4. Contraindication to MRI (e.g., due to safety reasons, such as presence of a pacemaker) 5. Pregnant at the expected time of 18F-fluciclovine administration 6. Expecting to be breastfeeding at the time of 18F-Fluciclovine and unwilling to stop breast-feeding for 24 hours. Temporary cessation of breastfeeding 24 hours after the time of imaging is allowed.