Task:

Load the Head MRI CISS dataset from "mri_ventricles/data/mri_ventricles_256x256x124_uint8.raw", the information about this dataset:
Head MRI CISS
Description: 1.5T MRT 3D CISS dataset of a human head that highlights the CSF (Cerebro-Spinal-Fluid) filled cavities of the head.
Data Type: uint8
Data Byte Order: little Endian
Data Spacing: 0.9x0.9x0.9
Data Extent: 256x256x124
Data loading is very important, make sure you correctly load the dataset according to their features.

Visualize the brain structures:
1. Apply volume rendering with a grayscale-to-color transfer function
2. Create a clip plane to show internal brain structures
3. Extract an isosurface for the skull or brain boundary (value around 80-120)
4. Use semi-transparent rendering (opacity 0.5-0.7) to show layers

Please think step by step and make sure to fulfill all the visualization goals mentioned above.

Finally, save the paraview state as "mri_ventricles/results/mri_ventricles.pvsm"