2. If a bleeding gastric ulcer is seen through an endoscope, which laser(s) could be used to caut...
2. If a bleeding gastric ulcer is seen through an endoscope, which laser(s) could be used to cauterize the tissue? (a) Argon ion (b) Nd:YAG (c) CO2 (d) XeF (excimer laser) (e) Er:YAG 3. What material compbses the core of high-quality optical fibres used to transmit lasers with wavelengths in the visible spectrum? (a) Silicate glass (b) Sapphire (c) Hollow waveguides (d) Chalcogenide glass 4. Choose the incorrect option about a typical fibre-optic delivery unit: (a) It is a subsystem of a laser-fibre integrated system. (b) It contains the coupling between a laser and the optical fibre. (c)It usually carries a cooling system to refrigerate the optical fibres because of heating by the laser. (d) It delivers the photo-sensitizer for PDT thoughout the body. 5. To which class of lasers do the common laser pointers used in classrooms and/or pre- sentations belong? (a) Class 1orI (b) Class 2 or II (c) Class 3 or III (d) Class 4 or IV
2. If a bleeding gastric ulcer is seen through an endoscope, which laser(s) could be used to cauterize the tissue? (a) Argon ion (b) Nd:YAG (c) CO2 (d) XeF (excimer laser) (e) Er:YAG 3. What material compbses the core of high-quality optical fibres used to transmit lasers with wavelengths in the visible spectrum? (a) Silicate glass (b) Sapphire (c) Hollow waveguides (d) Chalcogenide glass 4. Choose the incorrect option about a typical fibre-optic delivery unit: (a) It is a subsystem of a laser-fibre integrated system. (b) It contains the coupling between a laser and the optical fibre. (c)It usually carries a cooling system to refrigerate the optical fibres because of heating by the laser. (d) It delivers the photo-sensitizer for PDT thoughout the body. 5. To which class of lasers do the common laser pointers used in classrooms and/or pre- sentations belong? (a) Class 1orI (b) Class 2 or II (c) Class 3 or III (d) Class 4 or IV