Data preparation for MAISI tutorial is wrong for non-RAS data

[xygorn]

tutorials/generation/maisi/scripts/diff_model_create_training_data.py

Line 199 in 8b90a16

int(plain_transforms({"image": os.path.join(args.data_base_dir, filepath)})["image"].meta["dim"][_i])

In the data preparation, the plain_transforms uses monai.transforms.Orientationd(keys="image", axcodes="RAS"), to reorient the image, but the new dimension is set using plain_transforms({"image": os.path.join(args.data_base_dir, filepath)})["image"].meta["dim"][_i] which has the original dimension, not the new dimension.

[Can-Zhao]

@dongyang0122 Maybe Dong could evaluate this issue. Thank you!