Which term describes the molecule that selectively absorbs light to target tissue?

Which term describes the molecule that selectively absorbs light to target tissue?

• A. Chromophore
• B. Delivery System
• C. Optical Cavity
• D. TRT

Answer: (A)

Chromophores are the molecules that absorb light at specific wavelengths, which lets us target tissue selectively. When a laser or light source is used, the chromophore in the target tissue absorbs the photons and converts that energy into heat (or, in photodynamic therapy, reactive species). This absorption confines the effect to the areas containing the chromophore, enabling selective damage to the target while sparing surrounding tissue. The other terms describe different roles: a delivery system is what carries the chromophore to the site, an optical cavity is a device component that helps shape or hold the light, and TRT refers to a concept not describing the absorbing molecule.

Chromophores are the molecules that absorb light at specific wavelengths, which lets us target tissue selectively. When a laser or light source is used, the chromophore in the target tissue absorbs the photons and converts that energy into heat (or, in photodynamic therapy, reactive species). This absorption confines the effect to the areas containing the chromophore, enabling selective damage to the target while sparing surrounding tissue. The other terms describe different roles: a delivery system is what carries the chromophore to the site, an optical cavity is a device component that helps shape or hold the light, and TRT refers to a concept not describing the absorbing molecule.