[Insight-users] Confused about pixel Spacing

[Auron Ford Huton]

Hello ITK!!

I am working in microscopy image registration and I doubt how to express my pixel spacing (I think all my problems came from that...). I know that my pixel spacing is about 2.83 micrometres (0.00283mm). 
I am using .raw image so I used a .mhd to acces them... What of the following lines I should use to set my spacing?

ElementSpacing = 0.00283 0.00283

or

ElementSpacing = 2.83 2.83


Thank you in advance.

Auron.
 		 	   		  
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