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Interstitial diffuse optical tomography using an adjoint model with linear sources.

Xiaodong Zhou1, Timothy C Zhu1

  • 1Department of Radiation Oncology, University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104.

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|June 27, 2015
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Summary
This summary is machine-generated.

An improved interstitial diffuse optical tomography (iDOT) system uses linear sources for faster prostate optical property characterization during photodynamic therapy (PDT). This new system significantly speeds up data acquisition and reconstruction, making it more clinically practical.

Keywords:
diffuse optical tomographylinear sourcephotodynamic therapyprostate

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Area of Science:

  • Biomedical Optics
  • Medical Imaging
  • Optical Tomography

Background:

  • Characterizing prostate optical properties is crucial for effective photodynamic therapy (PDT).
  • Previous interstitial diffuse optical tomography (iDOT) systems used point sources, leading to slow data acquisition.

Purpose of the Study:

  • To develop and evaluate an improved iDOT system for in-vivo prostate optical property characterization during PDT.
  • To enhance system speed and practicality for clinical settings by utilizing linear light sources and detectors.

Main Methods:

  • Developed an iDOT system with multiple interstitial cylindrical linear light sources and isotropic detectors.
  • Employed a motorized system for sequential source/detector movement and a computerized attenuator for power control.
  • Solved the inverse problem of the steady-state diffusion equation using an adjoint model with Moore-Penrose scheme for 3D optical property reconstruction.

Main Results:

  • The linear source/detector iDOT system achieved data acquisition speeds at least 10 times faster than point source systems (<1 minute total acquisition time).
  • Reconstruction using linear sources/detectors was 20 times faster (30 minutes vs. 4 hours) compared to point sources on a standard PC.
  • Both linear and point source iDOT methods successfully reconstructed optical properties in phantoms, but linear sources demonstrated superior speed and practicality.

Conclusions:

  • The improved iDOT system with linear sources and detectors significantly accelerates data acquisition and reconstruction for prostate optical property mapping.
  • This linear-source/detector approach is more practical and efficient for clinical implementation compared to previous point-source iDOT methods.