medical physics use of laser multiple choices questions Q16- Use the data in que

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medical physics use of laser

multiple choices questions

Q16- Use the data in questions 15s and calculate the laser power at which thermal damage startsoccurring inretina?

A.5.64 x 10-6W

B.1.41 x10-6W

C.4.72 x 10-2W

D.9.42 x 10-2W

E.none of the above

Q17- Which of the following statement makes sense during eye surgery?

A) CO2lasers should be used as they emit at a long wavelength and they are focused on a larger spot size

B) ArF lasers are good laser to use because they emit at short wavelength

C) Er: Yag laser emitting at 3m should be used.

D) A Laser with a good penetration aqueous media is desirable

E) Any laser focused on the cornea can be used.

Q18- We want to diagnose a lesion in which hematoporphyrin derivative (HPD) is greatly concentrated. We also want to generate light to photoactivate the compound concentrated into the lesion. An endoscope must be used during the procedure simultaneously. Which steps below would you recommend to achieve this procedure successfully?

A). Use a CO2laser to diagnose the lesion, a Kr laser to photoactivate HPD and an endoscope made with focused silica fibers.

B). Use a red HeNelaser to diagnose to lesion, a Kr laser to photoactivate HPD and an endoscope made with fused silica fibers.

C). Use a Kr laser to diagnose the lesion, a red HeNe laser to photoactivate endoscope make with fused silica fibers.

D). Use a Kr laser to diagnose the lesion, a red HeNe laser to photoactivate HPD and an endoscope made with chalcogenide glass fibers.

E). Use an excimer laser to diagnose the lesion and photoactivate HPD. Use an endoscope made with sapphire sibers

Q19 which of the following statements is false?

A). The process of fluorescence is used to excite exogenous fluorophores

b). Er:Yag laser radiation is strongly absorbed by tissue.

C). The penetration of Er:Yag laser is very small in tissue.

D). FREDDY Nd:Yag can be used in lithotripsy

E). Ho:Yag cannot be used in lithotripsy

Explanation / Answer

There is no enough information to provide answers for question 16. So, I have answered question 17.

17) In ophthalmology all types of lasers are used. CO2 lasers have a greater wavelength and are focussed on a larger spot size. They are used in glaucoma surgery. ArF lasers having shorter wavelengths are used to treat retinal pathologies. Er:Yag lasers are used in cataract surgeries. Therefore, any laser with good penetration in aqueous media can be used. (option D)

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