PLUS Tutorial: How to build an fCal calibration phantom www.assembla.com/spaces/plus Author: Andras Lasso.

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Presentation transcript:

PLUS Tutorial: How to build an fCal calibration phantom Author: Andras Lasso

Print the phantom Download the phantom model from the repository: nk/PlusLib/data/CADModels/fCalPhantom/FCal_1.2.stl# nk/PlusLib/data/CADModels/fCalPhantom/FCal_1.2.stl# You can have a look at the model if you open it in Paraview or 3D Slicer Print the STL file using a regular 3D rapid prototyping printer Laboratory for Percutaneous Surgery (The Perk Lab) – Copyright © Queen’s University, 2011

Insert fiducial lines into the phantom Fiducial line material: regular fishing line or ice fishing line (ice fishing line has a visibility from a wider angle range) The endpoints of the fiducial lines shall correspond to the description in the device set configuration XML file, such as: ml ml The automatic calibration method in fCal supports a fiducial line structure containing two parallel N patterns. Laboratory for Percutaneous Surgery (The Perk Lab) – Copyright © Queen’s University, 2011 Back The 3D coordinates of the EndPoints are defined in the Phantom coordinate system. The Phantom coordinate systems origin is the endpoint of the A4 hole inside the box. See the image on the right or the coordinate system definition model here for more information: Phantom mode: fCal_1.0, Wiring: wiring_1.0:...

Example Phantom mode: fCal_1.0, Wiring: wiring_1.0 Laboratory for Percutaneous Surgery (The Perk Lab) – Copyright © Queen’s University, 2011 E3 (wire 1) e3 (wire 1) F3 (wire 2) j3 (wire 2) K3 (wire 3) k3 (wire 3) E4 (wire 4) e4 (wire 4) J4 (wire 5) f4 (wire 5) K4 (wire 6) k4 (wire 6) Front

Line alignment The fiducial line has a much smaller diameter than the printed holes, therefore it makes a big difference which side of the hole the line is aligned to All the lines are aligned to the same side of the holes. This ensures that the distance between the lines remain the same. By convention, we always align the lines to the left side of the holes for parallel wires (wire 1, 3, 4, 6) Due to the thickness of the phantom wall, the diagonal wires (wire 2, 5) can only be aligned in one way (towards the center of the phantom) Laboratory for Percutaneous Surgery (The Perk Lab) – Copyright © Queen’s University, 2011 Front ← → ← → ← ← ← ← ← ← ← ← Align to the left

Line stretching The fiducial lines should be stretched enough to be completely straight (the stretching has negligible effect on the line visibility, so it is enough to stretch it just so that it is straight) You can stretch the fiducial lines by using a rubber band as it is shown in the picture below Laboratory for Percutaneous Surgery (The Perk Lab) – Copyright © Queen’s University, 2011 Stretching