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Returns the coil-combined images in image domain. For Cartesian imaging, 3D
k-space (kz along z dim) must be provided. By default, pics assumes a 3D
reconstruction. For a slice-by-slice 2D reconstruction, pics can be called
in a loop. If no scaling factor is provided, pics will scale the data prior
to reconstruction. The scaling factor is calculated using the center k-space
region. This scaling will be undone before returning if the -S flag is provided
which may be important for computing quantitative parameters. Additional
dimensions such as coils, maps, and time must follow the dimension order
specified in mri.h, otherwise regularizers may be applied on the wrong
dimensions and the forward sense operator may be inaccurate. The sampling
mask is determined automatically from the provided k-space. For the sampling
mask to be calculated correctly, missing samples must be exactly zero.
Small values in k-space, perhaps from numerical errors, will cause the
sampling mask (reflected in logged acceleration factor), and the data
consistency step to be incorrect.
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