Study of Laser Interstitial Thermal Therapy (LITT) Treatment Response Assessment With Fluciclovine PET MR

Primary Objectives -To estimate the accuracy of F18 Fluciclovine PET MR for laser interstitial thermal therapy (LITT) treatment response assessment as determined by T1 post-contrast MR brain imaging. Secondary Objectives * To assess changes in F18 Fluciclovine defined disease with LITT. * To assess the volume change of the idealized quantitative T1 values of lesions compared -To assess the volume change of idealized quantitative T2 values of lesions compared to -Chemical Exchange Saturation Transfer (CEST) MRI - To assess the ability of CEST imaging to differentiate treatment change from residual disease in brain malignancy following LITT. * Multiple B Value Diffusion Imaging (Adv Diff) - To assess whether Adv Diff can differentiate treatment changes from residual disease in brain malignancy following LITT. * Gradient- and Spin-Echo DSC perfusion imaging - To assess whether GESE DSC improves differentiation of treatment change from residual disease in brain malignancy -Adv ASL perfusion imaging - To assess the ability of Adv ASL to differentiate treatment change from residual disease in brain malignancy following radiation therapy. * Exploratory Objectives * To assess the relationship between post-LITT enhancing brain tissue and F18 -To assess changes in regional homogeneity (ReHo) values after LITT.