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Figure 3. A ¹H-MRS (a) short echo time and (b) long echo time spectrum from a locally advanced rectal cancer. The sensitivity of MRS to different local magnetic fields generated in the molecule's electron valency clouds results in chemical species resonating at different frequencies. This is the basis for the different peaks illustrated in this example and allows investigators to probe the metabolism of cancers in vivo. Reprinted from [35].

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