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FIG 1. A–C, Relationships between the Ki-67 labeling index and the Cho value (A), the Cho/Cr ratio (B), and the Cho/NAA ratio (C). Open circles indicate that the spectroscopic voxel is homogeneous on MR images with absent, faint, or homogeneous enhancement by contrast material. Closed circles indicate that the spectroscopic voxel is heterogeneous on MR images before or after contrast administration (cases 17–24, Table). There is a strong linear relationship between the Ki-67 labeling index and the Cho value, indicated by open circles (y = 1.24 + 0.34 * x, r = .81, P < .0001). There is a weak correlation between the Ki-67 labeling index and the Cho/Cr or Cho/NAA ratio, indicated by open circles (y = 1.22 + 0.15 * x, r = .58, P < .02 and y = 0.65 + 0.23 * x, r = .60, P < .02, respectively). Extreme data for the Cho/NAA ratio from cases 6, 13, and 25 are not shown in the graph.
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