Getting coronal view in each iteration

Beginner Questions
1

Hi,
I want to go through all pixels in coronal plane on the 3D image and use sliceiterator. I was wondering how I can get coronal plane in each iteration for each slice?
For instance, does the following code give me the coronal slice?
Sit2.SetFirstDirection(2);
Sit2.SetSecondDirection(0);

2

Assuming identity direction matrix, it should. But I expect that iterating like that would be slower than iterating along first index as direction 0:

Sit2.SetFirstDirection(0);
Sit2.SetSecondDirection(2);