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Propagate FOV

Application Tip
Springorum, Rudolf Philips Healthcare Philips Global
van den Heuvel, Martina Philips Healthcare Philips Global

The function 'Propagate FOV' facilitates planning in many applications as typical imaging parameters are taken over from scan to scan.

Features of 'Propagate FOV'

Scans with the same geometry name within an ExamCard share

  • the number of stacks
  • the off-center values for each stack
  • the angulations for each stack

 

If the function 'Propagate FOV' is enabled, the scans also share:

  • Field of View (FOV)
  • Rectangular FOV (RFOV) 
  • fold-over direction
  • the slice coverage respective to the imaging volume in slice direction.

 

Depending on the type of scan, the slice coverage is propagated in different ways.

Propagation of slice coverage

In order to achieve the same slice coverage, the following actions are automatically performed.

 

3D SCANS 

The imaging parameter "Number of slices" will be adapted.

 

 

2D SCANS

The imaging parameter "Slice thickness" will remain unchanged and thus the slice coverage will not be propagated with 2D scans.

Only the FOV, RFOV and fold-over direction will be propagated.

 

 

M2D en MS SCANS

The propagation mechanism depends on the scan mode of the initial scan.

 

Propagation 3D scan -> M2D / MS scan

The imaging parameter "Number of slices" will be adapted.

 

Propagation M2D / MS scan -> M2D / MS scan

The imaging parameter "Number of slices" will always be kept the same. This is to ensure that slices can easily be compared between scans. 

 

The propagation with respect to the imaging parameters "Slice thickness" and "Slice gap" depends on the initial slice thickness of the scans.

 

  • If initially the slice thickness of the scans is the same, it will stay the same:

   changes of this parameter will be taken over.

     

   Example: when increasing the slice thickness from 5 mm to 6 mm, the slice thickness of

   the other scans will also be set to 6 mm - if their initial value has been 5 mm. Also the slice

   gap will be adapted.

  • If initially the slice thickness of the scans is not the same, slice gap and slice thickness will be adapted to the new slice distance (distance between center of adjacent slices). 

   In such a way, the slice thickness / slice gap ratio will remain unchanged.

     

   Example: when changing the slice thickness from 5 mm to 4 mm, in a scan with initially

   4 mm / 0.8 mm will change to 4.58 mm / 0.92 mm. This is done in such a way with respect

   to IR scans where typically a slice gap of 20% of the slice thickness is used.

 

Applications 'Propagate FOV'

When using 'Propagate FOV', always be aware of the fact that the fold-over direction is taken over. This can be an advantage in many applications, but also a disadvantage in other applications.

 

If scans with the same geometry (same geometry name) have purposely been set up with different fold-over directions e.g. for best image quality, don't use Propagate FOV as the fold-over direction would be affected and could affect image quality.

Enabling 'Propagate FOV'

  • Right click on an item (scan) within the ExamCard.
  • Select 'Propagate FOV' from the drop-down menu or press |Ctrl| F.


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Release 1, Release 10, Release 11, Release 9
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