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FRED project Absorbing Pore Inside Scattering Media Märta Lewander Lund 17 June 2008.

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Presentation on theme: "FRED project Absorbing Pore Inside Scattering Media Märta Lewander Lund 17 June 2008."— Presentation transcript:

1 FRED project Absorbing Pore Inside Scattering Media Märta Lewander Lund 17 June 2008

2 June 2008 Märta Lewander Background – human sinuses

3 June 2008 Märta Lewander 1. How much light gets through to the detector  The number of rays 2. How many of the detected photons carry a signal imprint  The number of rays that are detected that have passed through the sinus 3. How large is the mean absorption imprint  The length the rays have through the sinus interrogating distance Want to know

4 June 2008 Märta Lewander Model Incident Light Tissue Detected Light Sinus Approaces 1.Specified paths 2.History file 3.History script

5 June 2008 Märta Lewander Approach 1 - Paths Specify different paths -Not through sinus -1 time through sinus -2 times through sinus -... Problem: Still do not know the interrogation distance Path: Unique sequence of surfaces

6 June 2008 Märta Lewander Approach 2 – History file Advanced Raytrace FRED saves the positions at the different surfaces Saved in a file Raytrace Generated according to history file That ends up on detector

7 June 2008 Märta Lewander Approach 2 – History file

8 June 2008 Märta Lewander Approach 2 – Problem Detected Light Incident Light Problem: Need to use simplification

9 June 2008 Märta Lewander Approach 3 – History script Script Advanced raytrace nr of hits = 1 Stores the positions and the pathlength at the different surfaces Saved in a file

10 June 2008 Märta Lewander Approach 3 – History script

11 June 2008 Märta Lewander Approach 3 – Problem Problem - All the stored rays at a specific surace get new ID number - The before entity stored is always another surface  Approach 2 with simplification

12 June 2008 Märta Lewander Full scale model Simulation time: 3 h and 53 minutes Rays at start: rays Rays traced: rays Number of rays that hit the detector:1160 rays

13 June 2008 Märta Lewander Full scale model

14 June 2008 Märta Lewander Full scale model Intorragation path 50.6 mm

15 June 2008 Märta Lewander Conclusions + Easy to learn the basics nice interface many good functions -Hard to learn Frustrating when you can not output everything Time consuming

16 June 2008 Märta Lewander

17 June 2008 Märta Lewander Detection geometries Orbital – Frontal bonePalate - Cheek boneCheek – Cheek bone


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