Abstract
We report the detection of an object inside a phantom tissue using a spatial filter and a 5 mW He-Ne Laser. The phantom tissue is composed of 8% scattering Polystyrene spheres (particle size 579 nm) and is diluted to different concentrations in water. The solution is placed inside of a cuvette of length 5 cm and width 5 cm. The spatial filter, composed of a 4 cm plano-convex lens and a 10 urn pinhole, is able to extract ballistic and quasi-ballistic photons from the transmitted light. A photomultiplier tube is used for detection, and a lock-in amplifier is used to reduce the amount of noise in the signal. We are able to detect the object in a phantom tissue of 20 mean free paths [mfp) (concentration .016%) with a contrast of 99.0%. The contrast in a tissue with 30 mfp (concentration .024%) is 22.7%.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 200-208 |
| Number of pages | 9 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 2135 |
| DOIs | |
| State | Published - May 19 1994 |
| Externally published | Yes |
| Event | Advances in Laser and Light Spectroscopy to Diagnose Cancer and Other Diseases 1994 - Los Angeles, United States Duration: Jan 23 1994 → Jan 29 1994 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering