[Insight-users] mi registration problem

[Lydia Ng]

Hi John,

Is the bar easy to segment out? If so, one way might be to mask it out
and replace it with some background intensity.

- Lydia

> -----Original Message-----
> From: Dill, John [mailto:john-dill at uiowa . edu]
> Sent: Wednesday, October 08, 2003 8:38 AM
> To: 'insight-users at itk . org'
> Subject: [Insight-users] mi registration problem
>=20
> I have been having a problem with registering portfilm and drr images.
In
> my case, the algorithm registers the lateral projections just fine,
but in
> ap cases, I get mis-registrations.  The problem seems to be from the
fact
> that when the patient is on the treatment table, there is a metal bar
> attached to the table which is present in the portfilm, but not in the
CT,
> so the DRR doesn't have the corresponding bar in its projection.  The
bar
> shows up as roughly 10-15 pixels wide, and as tall as the image.  I
have
> tried some different filtering ideas, but can not come up with a good
> registration.  Does anyone have ideas on how to reduce this bar's
effects
> (automatically if possible)?
>=20
> Thanks,
> John
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