LASER test
Wavelength measures the distance between two corresponding points on adjacent light
waves, for example from one peak to the next, or from one trough to the next. Which is
the proper unit for measuring wavelength? - Correct answer-nanometers (nm)
t or f- Compared to healthy cells, compromised or unhealthy cells in tissues that are
injured or damaged are more 'reduced'. This means that damaged cells will more
readily absorb oxygen; and therefore damaged tissues will respond more readily to
laser therapy. - Correct answer-true
t or f- The "electromagnetic spectrum" is used to describe the entire range of radiation -
including gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, and radio
waves. Therefore, it is appropriate to refer to all of these as "electromagnetic radiation".
- Correct answer-true
In 2015 a world-wide panel of experts designated the term ____________ to describe
the therapeutic use of light. - Correct answer-photobiomodulation, or PBM
Surgical lasers cut tissue; and are used for performing surgery, removal of 'lumps and
bumps', and other ablative laser procedures. What is the mechanism of action for
surgical lasers? - Correct answer-Photothermal: the laser light has a very high power
density and causes excessive heating of water molecules, which vaporizes the water,
"explodes" the cells, and thus cuts the tissue.
Therapeutic lasers help to enhance tissue healing, and are used for pain management,
wound and injury healing, and other uses. What is the mechanism of action for
therapeutic lasers? - Correct answer-Both A and C are correct (Photochemical and
Photobiostimulative)
The term "LASER" is an acronym for: - Correct answer-light amplification by stimulated
emission of radiation
The very first therapeutic laser (of any class) received 510k market clearance from the
United States Food and Drug Administration (FDA) in _____.And the first class 4
therapy laser gained FDA clearance in _____. - Correct answer-2002 , 2003
In the late 1960's he made the observation that the hair of shaved mice grew back more
rapidly after exposure to low power laser light. As a result he is known as the 'Father of
Laser Therapy'. Who is he? - Correct answer-Dr. Endre Mester
t or f- Power is the rate of energy delivery, and Power = Energy ÷ Time (Power equals
energy divided by time)
, Proper units are: 1 Watt = 1 Joule ÷ 1 second. (One Watt equals one Joule per second.)
- Correct answer-true
Photons of laser light are absorbed by water molecules, hemoglobin, mitochondrial
enzymes and other tissue components. The general name for these components is
_______________. - Correct answer-chromophores
When therapeutic laser light is absorbed by enzymes in the mitochondria the result is an
increase in the production of ________, which leads to normalization of cell function,
pain relief, and healing. - Correct answer-adenosine tri-phosphate (ATP)
t or f- The Platinum 4 therapeutic laser delivers these wavelengths: 650, 810, 915 & 980
nanometers; and the H1 delivers these wavelengths: 650, 810 & 915 nanometers. -
Correct answer-true
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 _____. - Correct 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. - Correct answer-Coherence
The acronym "LED" stands for _____. - Correct answer-Light Emitting Diode
Which statement best describes the main difference between Laser and LED? - Correct
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
_____________ . - Correct 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." - Correct 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. - Correct answer-12
T or F- All Class 4 lasers damage tissue all of the time. - Correct 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? - Correct answer-810 nm
Wavelength measures the distance between two corresponding points on adjacent light
waves, for example from one peak to the next, or from one trough to the next. Which is
the proper unit for measuring wavelength? - Correct answer-nanometers (nm)
t or f- Compared to healthy cells, compromised or unhealthy cells in tissues that are
injured or damaged are more 'reduced'. This means that damaged cells will more
readily absorb oxygen; and therefore damaged tissues will respond more readily to
laser therapy. - Correct answer-true
t or f- The "electromagnetic spectrum" is used to describe the entire range of radiation -
including gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, and radio
waves. Therefore, it is appropriate to refer to all of these as "electromagnetic radiation".
- Correct answer-true
In 2015 a world-wide panel of experts designated the term ____________ to describe
the therapeutic use of light. - Correct answer-photobiomodulation, or PBM
Surgical lasers cut tissue; and are used for performing surgery, removal of 'lumps and
bumps', and other ablative laser procedures. What is the mechanism of action for
surgical lasers? - Correct answer-Photothermal: the laser light has a very high power
density and causes excessive heating of water molecules, which vaporizes the water,
"explodes" the cells, and thus cuts the tissue.
Therapeutic lasers help to enhance tissue healing, and are used for pain management,
wound and injury healing, and other uses. What is the mechanism of action for
therapeutic lasers? - Correct answer-Both A and C are correct (Photochemical and
Photobiostimulative)
The term "LASER" is an acronym for: - Correct answer-light amplification by stimulated
emission of radiation
The very first therapeutic laser (of any class) received 510k market clearance from the
United States Food and Drug Administration (FDA) in _____.And the first class 4
therapy laser gained FDA clearance in _____. - Correct answer-2002 , 2003
In the late 1960's he made the observation that the hair of shaved mice grew back more
rapidly after exposure to low power laser light. As a result he is known as the 'Father of
Laser Therapy'. Who is he? - Correct answer-Dr. Endre Mester
t or f- Power is the rate of energy delivery, and Power = Energy ÷ Time (Power equals
energy divided by time)
, Proper units are: 1 Watt = 1 Joule ÷ 1 second. (One Watt equals one Joule per second.)
- Correct answer-true
Photons of laser light are absorbed by water molecules, hemoglobin, mitochondrial
enzymes and other tissue components. The general name for these components is
_______________. - Correct answer-chromophores
When therapeutic laser light is absorbed by enzymes in the mitochondria the result is an
increase in the production of ________, which leads to normalization of cell function,
pain relief, and healing. - Correct answer-adenosine tri-phosphate (ATP)
t or f- The Platinum 4 therapeutic laser delivers these wavelengths: 650, 810, 915 & 980
nanometers; and the H1 delivers these wavelengths: 650, 810 & 915 nanometers. -
Correct answer-true
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 _____. - Correct 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. - Correct answer-Coherence
The acronym "LED" stands for _____. - Correct answer-Light Emitting Diode
Which statement best describes the main difference between Laser and LED? - Correct
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
_____________ . - Correct 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." - Correct 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. - Correct answer-12
T or F- All Class 4 lasers damage tissue all of the time. - Correct 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? - Correct answer-810 nm
