LASER test 49 Questions and Answers
The term "LASER" is an acronym for: -
Ans 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 _____. -
Ans 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? -
Ans Dr. Endre Mester
In 2015 a world-wide panel of experts designated the term ____________ to describe the
therapeutic use of light. -
Ans 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? -
Ans 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? -
Ans Both A and C are correct (Photochemical and Photobiostimulative)
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? -
Ans 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. -
Ans 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". -
Ans true
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.) -
Ans true
Photons of laser light are absorbed by water molecules, hemoglobin, mitochondrial enzymes and
other tissue components. The general name for these components is _______________. -
Ans 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. -
Ans 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. -
Ans 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 _____. -
Ans 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. -
The term "LASER" is an acronym for: -
Ans 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 _____. -
Ans 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? -
Ans Dr. Endre Mester
In 2015 a world-wide panel of experts designated the term ____________ to describe the
therapeutic use of light. -
Ans 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? -
Ans 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? -
Ans Both A and C are correct (Photochemical and Photobiostimulative)
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? -
Ans 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. -
Ans 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". -
Ans true
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.) -
Ans true
Photons of laser light are absorbed by water molecules, hemoglobin, mitochondrial enzymes and
other tissue components. The general name for these components is _______________. -
Ans 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. -
Ans 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. -
Ans 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 _____. -
Ans 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. -
