[Insight-users] Confused about pixel Spacing

[Auron Ford Huton]

Thank you for your answers!!

Now I have another doubt... If I can use 0.00283 an 2.83 indifferently, why can´t I used just a pixel spacing of 1??

Not if I can explain, is really so important to used a correct pixel spacing for registration or it´s ok if I use an value of 1 for the spacing (always being consisten all over the code)?

Thank you all!

Auron.

> Date: Wed, 11 Nov 2009 15:21:59 -0500
> Subject: Re: [Insight-users] Confused about pixel Spacing
> From: kishoreraom at gmail.com
> To: auron at hotmail.es; cquammen at cs.unc.edu
> CC: insight-users at itk.org
> 
> Once you choose a certain spacing, remember to consistently use that
> in all the subsequent processing filter settings such as sigma of
> Gaussian etc. In most filters, you will have the option
> SetUseImageSpacingOn() or Off() that you should also use. The output
> at any intermediate stage will also have the same units.
> 
> It is better to use the 2.83 micrometer value since the other value
> seems very cumbersome to handle.
> 
> Kishore
> 
> On Wed, Nov 11, 2009 at 1:47 PM, Cory Quammen <cquammen at cs.unc.edu> wrote:
> > Auron,
> >
> > The units you choose for pixel spacing (meters or micrometers) do not
> > matter. It only matters that you are consistent in what unit you use
> > to set the spacing for both the fixed and moving images.
> >
> > Hope that helps,
> > Cory
> >
> > On Wed, Nov 11, 2009 at 12:58 PM, Auron Ford Huton <auron at hotmail.es> wrote:
> >> 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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> >
> >
> >
> > --
> > Cory Quammen
> > Center for Computer Integrated Systems for Microscopy and Manipulation (CISMM)
> > Department of Computer Science
> > University of North Carolina at Chapel Hill
> > http://www.cs.unc.edu/~cquammen
> > _____________________________________
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> >
> > Visit other Kitware open-source projects at
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> > http://www.kitware.com/products/protraining.html
> >
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