Photodynamic Therapy (Bio-Photonics SBE 3049)
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Questions and Answers

What is the primary mechanism of Photodynamic Therapy?

  • Using light energy alone to damage abnormal tissues
  • Directly inducing apoptosis in tumor cells
  • Stimulating the host immune response through chemical reactions
  • Combining light energy with a photosensitizer to activate its toxic effects (correct)

    • What is the effect of light activation on the photosensitizer?

  • It has no effect on the photosensitizer's properties
  • It increases the photosensitizer's toxicity to normal tissues
  • It makes the photosensitizer inert
  • It makes the photosensitizer toxic to the targeted tissue (correct)

    • What is one of the indirect cellular effects of Photodynamic Therapy?

  • Vascular damage during or after light treatment (correct)
  • Autophagy of normal cells
  • Direct oxidation of tumor cells
  • Stimulation of the host immune response through apoptosis

    • What is one of the approved areas of usage for Photodynamic Therapy?

    <p>Obstructive esophageal cancer</p> Signup and view all the answers

    What is a major challenge facing Photodynamic Therapy?

    <p>Tissue optical properties and photosensitizer distribution</p> Signup and view all the answers

    What is the effect of light absorption and scattering in tissues on fluence rates?

    <p>It decreases the fluence rates</p> Signup and view all the answers

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