Clair Townsend arrived at the endoscopy center 2 days before her scheduled interventional bronchoscopy to receive an injection of a photosensitive intravenous dye that the pulmonologist explained would highlight the dysplastic tissues of her bronchi that were precancerous.He scheduled her for an ablative procedure called photodynamic therapy (PDT),where the highlighted tissues would be affected by the laser light that is color-specific for uptake of the dye.Select the laser that would be appropriate to use on this patient during a PDT bronchoscopy.

Question

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The frequency-doubled YAG (KTP)laser is often utilized for the ablation of hypertrophied prostatic tissue.An Nd:YAG beam of 1064 nm is passed through a potassium titanyl phosphate (KTP)crystal to produce an intense green laser light of 532 nm.Delivering the Nd:YAG incident beam of 1064 nm through the KTP crystal shortens the wavelength by half,to 532 nm,while doubling the beam's frequency.The 532-nm wavelength responds to tissue in the same manner as the argon beam.It is color selective and highly absorbed by hemoglobin,melanin,and other similar pigmentation.The beam is conducted to tissue through a fiber,and this wavelength can be transmitted through clear solutions and structures.The depth of penetration is approximately 1 to 2 mm.

Clair Townsend Arrived at the Endoscopy Center 2 Days Before