LASER TEST QUESTIONS WITH REVISED ANSWERS (ALREADY GRADED A+)
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Course
LASER
Institution
LASER
LASER TEST QUESTIONS WITH REVISED ANSWERS (ALREADY GRADED A+)
The level of laser radiation to which a person may be exposed without hazardous effects or adverse biological changes in the eye or skin is the _____. - Answer- Maximum Permissible Exposure (MPE)
___________ is one of the unique pr...
LASER TEST QUESTIONS WITH
REVISED ANSWERS (ALREADY
GRADED A+)
The level of laser radiation to which a person may be exposed without hazardous
effects or adverse biological changes in the eye or skin is the _____. - Answer-
Maximum Permissible Exposure (MPE)
___________ is one of the unique properties of laser light. It arises from the stimulated
emission process which provides the amplification. Since a common stimulus triggers
the emission events which provide the amplified light, the emitted photons are "in step"
and have a definite phase relation to each other. - Answer- Coherence
The acronym "LED" stands for _____. - Answer- Light Emitting Diode
Which statement best describes the main difference between Laser and LED? -
Answer- Laser light is coherent, LED light is not.
The space within which the level of direct, reflected or scattered radiation during normal
operation exceeds the applicable maximum permissible exposure is the
_____________ . - Answer- Nominal Hazard Zone (NHZ)
Although a debate continues over the coherency of laser light once it interacts with
tissue, a pioneer in the field of laser therapy, Dr. Jan Tuner pointed out, "Whenever LED
and LASERs have been compared in studies (13 studies found), _______ has come out
on top." - Answer- LASERS
One watt is equal to a joule per second. Therefore, when set to an average power of 12
Watts, a therapy laser delivers _____ Joules per second. - Answer- 12
T or F- All Class 4 lasers damage tissue all of the time. - Answer- false
Given that all other factors are equal, which wavelength will penetrate more deeply into
the body, and is also at the peak of absorption for the cytochrome c oxidase enzyme in
the mitochondria? - Answer- 810 nm
Laser energy is measured in __________. - Answer- joules, J
, Energy = Power x time
How much energy does an 12 watt laser produce in 5 minutes? - Answer- 12 W x 5 min
x 60 sec = 3600 joules
__________ indicates the concentration of the laser light. It is measured in watts per
centimeter squared (W/cm2). For surgical lasers, this number is greater than 1000.For
therapy lasers, this number is less than 10. - Answer- Power Density
The recommended dosage for the treatment of superficial wounds is ________. -
Answer- 2-4 joules per square centimeter
A therapy laser delivers 2400 joules, which is applied to an area of 400 square
centimeters. Calculate the energy density, in J/cm2. - Answer- 2400 ÷ 400 = 6
If the power is kept constant, what is the relationship between spot size and power
density? - Answer- Smaller spot size = higher power density (Greater risk of burning.)
t or f- With Class IV lasers, the laser technician and the patient are the only ones in the
treatment area that must wear safety goggles. Everyone else in the room does not need
to wear eye protection. - Answer- false
t or f- Protection is provided by proper protective eyewear against the primary beam, so
it is OK to look directly into the primary beam when you are wearing protective goggles.
- Answer- false
t or f- Class 4 laser therapy does not cause significant deep heating, and high doses of
infrared laser have been shown to have no adverse effect on open epiphyseal plates.
Therefore, it is safe to use class 4 laser therapy on young patients with open growth
plates. - Answer- true
t or f- When treating the neck, it is safe to treat to posterior, lateral, and antero-lateral
surfaces of the neck. But it is not recommended to treat directly over the thyroid gland. -
Answer- true
t or f- Regarding laser therapy on patients with an active cancer:
- Human patients: It is recommended that you should not treat at all, anywhere,
primarily due to medico-legal considerations.
- Animal patients: It is recommended that you should not treat directly over the cancer
tumors, treating distant from the tumor is OK. - Answer- true
t or f- According to the FDA 510k Clearance, class 4 therapy lasers from Summus
Medical Laser are "intended to emit energy in the infrared spectrum to provide topical
heating for the purpose of elevating tissue temperature for the temporary relief of minor
muscle and joint pain, arthritis, muscle spasm, relieving stiffness and promoting
relaxation of the muscle tissue." - Answer- true
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