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List: insight-users
Subject: [Insight-users] registration of images with missing data
From: Matthias Schabel <mschabel () ucair ! med ! utah ! edu>
Date: 2007-09-27 17:56:43
Message-ID: 92951B4E-1E91-488A-85E6-4862C58ACFDD () ucair ! med ! utah ! edu
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I'm interested in performing image registration on float/double
images in which NaN entries indicate missing or bad data. I guess
this falls into the more general sphere of registering images that
have been masked - I wasn't able to find any information on this
particular problem in the User's Guide. Any suggestions on how to do
this efficiently? Specifically, I have two 3D images - one is a map
of T1 measurements and the other is a map of mean intensity. In some
cases it is not possible to get sensible values of T1 from the
algorithm we are using, in which case the entry is set to NaN. The
mean intensity map has no missing entries (but, in principle, I might
want to register with an image having a different mask). Clearly,
interpolation will potentially create 3x3 holes around each NaN
entry, but other than that, I think the actual algorithms should work
fine if there is a way to tell the image metric calculation to ignore
NaNs...
Matthias
----------------------------------------------------------------
Matthias Schabel, Ph.D.
Assistant Professor, Department of Radiology
Utah Center for Advanced Imaging Research
Center for Advanced Medical Technologies
Room 2120
729 Arapeen Drive
Salt Lake City, UT 84108
801-587-9413 (work)
801-585-3592 (fax)
801-706-5760 (cell)
801-484-0811 (home)
matthias dot schabel at hsc dot utah dot edu
----------------------------------------------------------------

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<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: \
after-white-space; ">I'm interested in performing image registration on float/double \
images in which NaN entries indicate missing or bad data. I guess this falls into the \
more general sphere of registering images that have been masked - I wasn't able to \
find any information on this particular problem in the User's Guide. Any suggestions \
on how to do this efficiently? Specifically, I have two 3D images - one is a map of \
T1 measurements and the other is a map of mean intensity. In some cases it is not \
possible to get sensible values of T1 from the algorithm we are using, in which case \
the entry is set to NaN. The mean intensity map has no missing entries (but, in \
principle, I might want to register with an image having a different mask). Clearly, \
interpolation will potentially create 3x3 holes around each NaN entry, but other than \
that, I think the actual algorithms should work fine if there is a way to tell the \
image metric calculation to ignore NaNs... <DIV><BR \
class="khtml-block-placeholder"></DIV><DIV>Matthias</DIV><DIV><SPAN \
class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; \
color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; \
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widows: 2; word-spacing: 0px; "><DIV><BR \
class="khtml-block-placeholder"></DIV><DIV>----------------------------------------------------------------</DIV><DIV>Matthias \
Schabel, Ph.D. </DIV><DIV>Assistant \
Professor, Department of Radiology</DIV><DIV>Utah Center for Advanced Imaging \
Research</DIV><DIV>Center for Advanced Medical Technologies</DIV><DIV>Room \
2120</DIV><DIV>729 Arapeen Drive</DIV><DIV>Salt Lake City, UT \
84108</DIV><DIV>801-587-9413 (work)</DIV><DIV>801-585-3592 \
(fax)</DIV><DIV>801-706-5760 (cell)</DIV><DIV>801-484-0811 (home)</DIV><DIV>matthias \
dot schabel at hsc dot utah dot \
edu</DIV><DIV>----------------------------------------------------------------</DIV><DIV><BR></DIV><BR \
class="Apple-interchange-newline"></SPAN><SPAN></SPAN></DIV></BODY></HTML>
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