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FIG 1. Images of patient 1.
A, Axial view fat-suppressed T2-weighted MR image shows the position of the volume of interest for spectroscopy represented by the white square placed within the primary NPC tumor.
B, Spectrum acquired at 1H MR spectroscopy with TE 136 from the primary NPC tumor shown in A. The nominal voxel volume was 3.9 cm3. Prominent peaks detected were Cho (3.2 ppm), Cr (3.03 ppm), and lipids (1.30 ppm).
C, Lipids were removed from the original spectrum shown in B with the use of Hankel-Lanczos singular value decomposition filtering before spectral fitting was performed (bottom trace). The fitted spectrum performed in the time domain is shown by the middle trace, and the top trace represents the residual signal intensity.
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