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Sparse sequence gridding

Jonathan Weine requested to merge sparse_sequence_gridding into main

Instead of always requiring the sequence to be gridded adhering to raster time, for some applications returning the inflection points and sampling points in a joint array might be desired.

To this end, three new methods in cmrseq.Sequence are added:

  • combined_gradients()
  • combined_rf()
  • combined_adc()

each of them providing the array-representation of their corresponding sequence part in a sparse "grid". Adhering to the output of dense gridding.

The new methods are used in the cmrseq.plotting.plot_sequence(...) funtion to accellarate plotting of long sequences.

In addition a new method to validate temporal overlap of contained acqusition blocks is added

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