Kejia Cai1, Mohammad Haris1, Anup Singh1, Ravi Prakash Reddy Nanga1, Ranjit Ittyerah1, Damodar Reddy1, Harish Poptani1, Hari Hariharan1, Ravinder Reddy1
1University of Pennsylvania, Philadelphia, PA, United States
The CEST effect at 2ppm (CEST@2ppm), quantified through fitting Z spectrum with Lorentzian functions, decreases in tumor compared to normal brain tissue and further reduces as tumor progresses, correlating to MRS quantification of creatine. Along with other justifications, we suggest creatine to be the major contribution to the CEST@2ppm. Our results show F98 tumors have significant lower CEST@2ppm effect compared to 9L tumors. Once validated, the high-resolution creatine mapping method could be used for grading brain tumors.