Metabolite Mapping with Extended Brain Coverage Using a Fast Multisection MRSI Pulse Sequence and a Multichannel Coil

Figure 2

Simulated echo with 256 data points and its spectrum obtained with 1024 data points (upper). The time and frequency domain fitting algorithms can fully recover each of them. However, when fitting the spectrum with 256 data points, or when the spectrum was zero-filled from 256 to 1024 data points, sizeable errors are evident as a consequence of either low spectral resolution or truncation effects, which manifest as wiggles in the spectrum after zero-filling (lower).