Difference between revisions of "Projects:RegistrationLibrary:RegLib C15"

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[[Projects:RegistrationDocumentation:UseCaseInventory|Back to Registration Use-case Inventory]] <br>
 
[[Projects:RegistrationDocumentation:UseCaseInventory|Back to Registration Use-case Inventory]] <br>
  
==Slicer Registration Librar Case 15: Brain MR Alignment along AC-PC line==
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{| style="color:#bbbbbb; background-color:#333333;" cellpadding="10" cellspacing="0" border="0"
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==<small>v3.6.1</small> [[Image:Slicer3-6Announcement-v1.png‎|150px]] Slicer Registration Library Case #15: <br>Brain MR Alignment along AC-PC line==
|[[Image:RegLib_C15_Fiducials.png‎|150px|lleft|this is a set of reference landmarks. The transform is derived from these fiducials.]]  
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=== Input ===
|[[Image:Arrow_left_gray.jpg|100px|lleft]]  
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{| style="color:#bbbbbb; " cellpadding="10" cellspacing="0" border="0"
|[[Image:RegLib_C15_MRI.png‎|150px|lleft|this is the moving image to which the calculated transform is applied.]]
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|[[Image::RegLib_C15_Fiducials.png|150px|lleft|this is the fixed reference image. All images are aligned into this space]]  
|align="left"|LEGEND<br><small><small>
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|[[Image:RegArrow_Affine.png|100px|lleft]]  
[[Image:Button_red_fixed.jpg|20px|lleft]]  this indicates the reference data that determines the transform.<br>
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|[[Image:RegLib_C15_MRI.png‎|150px|lleft|this is the moving image. The transform is calculated by matching this to the reference image]]
[[Image:Button_green_moving.jpg|20px|lleft]] this indicates the moving image that is being realigned.  <br>
 
</small></small>
 
 
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|[[Image:Button_red_fixed.jpg|40px|lleft]]  Fiducials
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|fixed image/target
 
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|[[Image:Button_green_moving.jpg|40px|lleft]] T1 SPGR
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|moving image
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|2 points marking AC-PC line<br> 3+ points marking midline
 
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|1 mm isotropic<br> 256 x 256 x 116<br>RAS
 
 
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===Objective / Background ===
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=== Modules ===
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=== Keywords ===
 
=== Keywords ===

Revision as of 21:59, 29 October 2010

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v3.6.1 Slicer3-6Announcement-v1.png Slicer Registration Library Case #15:
Brain MR Alignment along AC-PC line

Input

[[Image::RegLib_C15_Fiducials.png|150px|lleft|this is the fixed reference image. All images are aligned into this space]] lleft this is the moving image. The transform is calculated by matching this to the reference image
fixed image/target moving image

Modules

Keywords

MRI, brain, head, anterior commissure, posterior commissure, AC-PC Line, Talairach, fiducial alignment

Input Data

  • Button green moving white.jpg moving: T1 MPRAGE 1x1x1 mm voxel size

Registration Challenges

  • A dedicated module for AC-PC alignment is used.
  • the only difficulty lies with accurate placement of the AC-PC fiducials. Depending on image resolution and contrast these can be difficult to find.
  • midline fiducials should be easily obtainable from axial and coronal views. 3 midline fiducials suffice; more is recommended for a more robust solution.

Key Strategies

  • this is a special case of fiducial-based alignment. Instead of aligning two sets of fiducial pairs, only one set of fiducials is aligned with a predefined orientation: The plane defined by the midline fiducials is aligned to be vertical in coronal/axial views, and the line defined by the AC-PC line is rotated to be horizontal in a sagittal view.

Registration Results

original and aligned MRI

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