NIfTILoader (Preclinical)
=========================

**Purpose.** Load a NIfTI/Analyze file into the pipeline context as either ``AbsData`` or ``Image``.

Context I/O
-----------

- **Writes:**  
  - If ``target="AbsData"`` → (X,Y,N)  
  - If ``target="Image"``   → (X,Y,Z,NR,1)  
  - Also sets ``savedir`` (creates if needed)

Parameters
----------

=================  ===================  ==========================================
Key                Type / Default       Meaning
=================  ===================  ==========================================
``path``           str / *required*     Path to .nii/.nii.gz or .hdr/.img
``target``         str / ``AbsData``    ``AbsData`` or ``Image``
``squeeze_last``   bool / ``True``      When ``AbsData``, flatten trailing dims to N
``savedir``        str / ``results``    Output directory
=================  ===================  ==========================================

YAML example
------------

.. code-block:: yaml

    modules:
      - name: NIfTILoader
        params:
          path: ./input/asl.nii.gz
          target: Image
          savedir: ./results/asl_case1