  This paper investigates the correlation between magnetic resonance
spectroscopic imaging (MRSI) and magnetic resonance fingerprinting (MRF) in
glioma patients by comparing neuro-oncological markers obtained from MRSI to
T1/T2 maps from MRF.
  Data from 12 consenting patients with gliomas were analyzed by defining
hotspots for T1, T2 and various metabolic ratios, and comparing them using
S{\o}rensen-Dice Similarity Coefficients (DSCs) and the distances between their
centers of intensity (COIDs).
  Median DSCs between MRF and the tumor segmentation were 0.73 (T1) and 0.79
(T2). The DSCs between MRSI and MRF were highest for Gln/tNAA (T1: 0.75, T2:
0.80, tumor: 0.78), followed by Gly/tNAA (T1: 0.57, T2: 0.62, tumor: 0.54) and
tCho/tNAA (T1: 0.61, T2: 0.58, tumor: 0.45). The median values in the tumor
hotspot were T1=1724 ms, T2=86 ms, Gln/tNAA=0.61, Gly/tNAA=0.28, Ins/tNAA=1.15,
and tCho/tNAA=0.48, and, in the peritumoral region, were T1=1756 ms, T2=102ms,
Gln/tNAA=0.38, Gly/tNAA=0.20, Ins/tNAA=1.06, and tCho/tNAA=0.38, and, in the
NAWM, were T1=950 ms, T2=43 ms, Gln/tNAA=0.16, Gly/tNAA=0.07, Ins/tNAA=0.54,
and tCho/tNAA=0.20.
  The results of this study constitute the first comparison of 7T MRSI and 3T
MRF, showing a good correspondence between these methods.
