ColonCa – Medical Background ColonCa – Medical Background 3. Most common Ca 3. Most common Ca 2. Common Ca leading to death 2. Common Ca leading to death 11% of all new cancers/year 11% of all new cancers/year Sequence Adenoma – Carcinoma Sequence Adenoma – Carcinoma accepted accepted Colonoskopy = gold standard – Colonoskopy = gold standard – BUT: BUT:
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ColonCa – Medical Background 3. Most common Ca 2. Common Ca leading to death 11% of all new cancers/year Sequence Adenoma – Carcinoma accepted.
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ColonCa – Medical ColonCa – Medical BackgroundBackground
ColonCa – Medical ColonCa – Medical BackgroundBackground 3. Most common Ca3. Most common Ca
2. Common Ca leading to death2. Common Ca leading to death 11% of all new cancers/year11% of all new cancers/year Sequence Adenoma – Carcinoma Sequence Adenoma – Carcinoma
acceptedaccepted Colonoskopy = gold standard – Colonoskopy = gold standard –
BUT:BUT:
3D Visualization of the 3D Visualization of the Colon:Colon:
3D Visualization of the 3D Visualization of the Colon:Colon:
Post processing of cross Post processing of cross sectional data:sectional data:- time consumingtime consuming- hardware intensiv (expensive!)hardware intensiv (expensive!)- specialized staff necessaryspecialized staff necessary
Path planning for automated Path planning for automated „fly through“ complicated and „fly through“ complicated and even operator dependenteven operator dependent
Endoscopic view display just a Endoscopic view display just a small proportion of the colonic small proportion of the colonic surface -> Ante and - surface -> Ante and - retrograde views necessaryretrograde views necessary
What do you wanna have What do you wanna have for CT - colonoscopy?for CT - colonoscopy?
What do you wanna have What do you wanna have for CT - colonoscopy?for CT - colonoscopy? Inspection of total colonic Inspection of total colonic
surface surface Fast toolFast tool Minimal interactionMinimal interaction No operator influenceNo operator influence Easy and quick to reportEasy and quick to report (Hardware independent)(Hardware independent)
„„Virtual Virtual dissection“dissection“
„„Virtual Virtual dissection“dissection“
Stretch the colon and cut it Stretch the colon and cut it along it‘s longitudinal axis along it‘s longitudinal axis similiar to the pathologist‘s similiar to the pathologist‘s tabletable
„„Virtual Virtual dissection“dissection“
„„Virtual Virtual dissection“dissection“
„„Virtual dissection“ Virtual dissection“ - How to do?- How to do?
„„Virtual dissection“ Virtual dissection“ - How to do?- How to do?
Data aquisitionData aquisition Segmentation - Fuzzy Segmentation - Fuzzy
connectedconnected Extraction of the centerline Extraction of the centerline
(Skeletonisation - Thining)(Skeletonisation - Thining) Calculation of the cross Calculation of the cross
sectionssections „ „Remapping“ to 2DRemapping“ to 2D
Virt.Diss. - Data AquisitionVirt.Diss. - Data AquisitionVirt.Diss. - Data AquisitionVirt.Diss. - Data Aquisition
- Surface Sampled uniformally.Surface Sampled uniformally.- No missing elements. If No missing elements. If
sample step small enough.sample step small enough.- Area Preservation.Area Preservation.- Deformation in the y direction-Deformation in the y direction-
ShrinkingShrinking- Deformation increasing with Deformation increasing with
distance to the vertical center distance to the vertical center line.line.