Q20- which of the following statement is true is tattoo removals? Excimer lasers
ID: 3278079 • Letter: Q
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Q20- which of the following statement is true is tattoo removals?
Excimer lasers are used in tattoo removals
Alexandrite and Ruby lasers cannot be used in tattoo removal
Selective process occurs when tattoos are being removed
The colours of the tattoo have nothing to do with the choices of laser to be removed
An endoscope a CO2laser is often used in tattoo removal procedures.
Q22- what limits the application of a CO2 laser with endoscopes?
The technology of endoscope design is not suitable for low infrared sources.
CO2 lasers emit at low power
CO2 lasers are not used very much in medical applications.
The poor choices of fibres available for the CO2 laser are not suitable for medical applications
All the above.
Q35- which two amongst the five-following statement are true?
Chalcogenide glass is used to make fibres that transmit the radiation from a CO2laser
Chalcogenide glass fibre have good mechanical properties
Chalcogenide glass fibres are soluble in an aqueous medium (issue with toxicity) thus they are not desirable in medical applications.
Fused-silica glass fibres are efficiently transmitting the radiation from a CO2laser
Diffusers used in photodynamic therapy are always well polished.
Q36- Which two amongst the five-following statement are wrong?
A Stent can be used to treat restenosis
A lysis of the lumen by rotational ablation is desirable before inserting astent
a catheterwith very large outer diameter must be used in angioplasty
Devices sure as expandable balloons are never used in angioplasty before inserting a stent
XeCl excimer laser has never been used clinically to remove atherosclerotic plaque in angioplasty
Er: Yag radiation is used to cut tissue. Assume that the absorption coefficient alpha = 10000 cm^-1 and K = 10^-3 cm^2 s^-1. To vaporize tissue, the surface temperature T_s must reach 100 degree C. Assume T_b = 37 degree C. Calculate T (z, t) at z = 0.001 mm and t = 10 mu s after the laser is switched on. a) 89 degree C b) 99 degree C c) 67 degree C d) 45 degree C e) none of the aboveExplanation / Answer
20] third option is correct.
Excimer lasers are used to treat ecazema and white scars, not tattos.
Alexandrite and Ruby lasers can be used in tattoo removal.
The choices of laser to be used depends on colour of tatto to be removed.
CO2 lasers are not endoscope.
Selective process occurs in tatto removal.
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