Timing and rasterization

ADC dwell times and acquisition durations compatible with both the ADC and the gradient raster, and the quantization of a time to a raster. Times are in s. Receiver bandwidth is 1 / dwell in Hz; bandwidth per pixel is 1 / (num_samples * dwell). Timing and rasterization describes the four rasters and the coupling between the ADC and gradient rasters.

ADC timing

Object	Input	Returns	Purpose
calc_adc_segments	Samples, dwell, system limits, shorten or lengthen	Number of segments; samples per segment	Equal-sample ADC segmentation.
calc_adc_timing	Samples, target dwell, gradient and ADC rasters	Dwell (s); acquisition duration (s)	Dwell on the ADC raster, duration on the gradient raster.
quantize_readout_timing	Samples, receiver bandwidth (Hz), rasters, minimum flat time	Dwell (s); flat time (s)	Dwell from a requested receiver bandwidth.

Raster quantization

Object	Input	Returns	Purpose
round_to_raster	Time (s), raster (s)	Nearest raster multiple (s), ties to even	Round to nearest.
ceil_to_raster	Time (s), raster (s)	Next raster multiple (s), 1e-10 relative tolerance	Round up.