Question

Question 23 (1 point) A lesion on skin has been identified. You want to generate a photochemical reaction on this region. Assume that the lesion is concentrated with hematoporphyrin derivative (HPD). What is the best method for triggering the photochemical reaction in the lesion? Expose the tumour directly with an Nd:Yag laser emitting at 1 = lum O Insert diffusers into the lesion in order to scatter red light at X = 633 nm in all directions Use an Argon laser (green light) and use an endoscope to deliver the energy to the lesion Insert diffusers into the lesion in order to scatter blue light in all directions Shine any laser source over the lesion

Answer 1

23) Use argon laser and use an endoscope to deliver energy to lasion. This is the best method for treatment and triggering photo chemical reaction in lasion.

21). Choosing largest core diameter decrease illumination and increase resolution. You should choose fibre with core diameter d within 100-200 micrometer and cladding thickness within 3 to 5 micrometer.