How well do you know lasers & IPLs now?

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Quiz Questions

1.
What is fluence?
- A.
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  Energy Density
- B.
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  Colour of light
- C.
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  Speed of light
2.
A Class 4 laser has a power output greater than...
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- A.
  1 mW
- B.
  5 mW
- C.
  500 mW
3.
Fresnel reflections are...
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- A.
  Surface reflections
- B.
  Back-scattered light
- C.
  A combination of the above two
4.
The Fitzpatrick skin typing protocol was originally developed for the purpose of
- A.
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  accurate determination of skin colour to faclicitate laser/IPL treatments
- B.
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  estimation of how tolerant different skin types are to UVB radiation exposure
- C.
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  estimation and differentiation of the ethnicity of humans
5.
What is monochromaticity?
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- A.
  the frequency of light
- B.
  the divergence of a laser
- C.
  the single wavelength of a laser
6.
What is Selective Photothermolysis?
- A.
  Photo bio-stimulation of tissue with selected colour of light to reduce inflammation
- B.
  Skin rejuvenation by laser resurfacing
- C.
  Selective coagulation of local tissue structures by utilising specific colour of light that has high absorption in the common skin chromophores
7.
What can induce more dermal scattering?
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- A.
  Light energy
- B.
  Repetition rate
- C.
  Scar tissue
8.
The MPE is...
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- A.
  the maximum permissible fluence
- B.
  the maximum permissible wavelength
- C.
  the maximum permissible pulsewidth
9.
The human skin is optically opaque which implicates that a collimated beam of light (like a laser) will be
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- A.
  kept collimated through the epidermis/dermis
- B.
  focused in the lower dermis due to the high refractive index of collagen
- C.
  scattered strongly and a substantial part of the radiation will leave the skin in the backward direction
10.
Depth of penetration depends on...
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- A.
  Repetition rate
- B.
  Fluence
- C.
  Spot diameter
11.
What is scattering?
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- A.
  absorption followed by emission of a photon
- B.
  absorption followed by heating of an atom
- C.
  absorption followed by reflection of a photon
12.
'Optical density' is
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- A.
  Energy/time
- B.
  The optical thickness of safety glasses
- C.
  The optical properties of a laser crystal
13.
At what temperature is pain felt in the skin?
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- A.
  40 degrees Celsius
- B.
  45 degrees Celsius
- C.
  50 degrees Celsius
14.
For a given pulse duration the peak power depends on :
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- A.
  Wavelength
- B.
  Energy
- C.
  Spot diameter
15.
Which colours of light is reflected when a red object is illuminated with white light (i.e. contains all colours)
- A.
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  Blue and green
- B.
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  Yellow and orange
- C.
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  Red
16.
Clinically Useful Penetration Depth must include
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- A.
  Wavelength
- B.
  Spot diameter
- C.
  Fluence
17.
IPL spots can be overlapped...
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- A.
  Yes
- B.
  No
- C.
  It doesn't matter
18.
What is the thermal relaxation time?
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- A.
  It is the pulse duration of the laser
- B.
  It is the heating time of the targets
- C.
  It is the cooling time of the targets
19.
What is 'fluence'?
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- A.
  Energy/time
- B.
  Energy/wavelength
- C.
  Energy/spot size
20.
A typical IPL system might emit:
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- A.
  300 - 600 nm
- B.
  500 - 1500 nm
- C.
  400 - 1200 nm
21.
Which laser spot diameter will penetrate furthest into the dermis?
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- A.
  2 mm
- B.
  4 mm
- C.
  6 mm
22.
The energy density of laser/IPL equipment is called fluence. What is the correct unit for fluence?
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- A.
  W/cm^2
- B.
  J/cm^2
- C.
  J
23.
The pulse duration determines
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- A.
  Absorption
- B.
  Peak temperatures
- C.
  Fluence
24.
Which wavelength penetrates the deepest in to the dermis?
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- A.
  1064 nm
- B.
  532 nm
- C.
  755 nm
25.
The peak temperature in the tissue at a fixed fluence of a laser /IPL will
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- A.
  Increase if the pulse duration is made longer
- B.
  Increase if the pulse duration is made shorter
- C.
  Not change for different pulse durations as the peak temperature only depends on the fluence
26.
Loss of fluence in the skin is caused by?
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- A.
  wavelength
- B.
  spot size
- C.
  scattering
27.
A Q-switch is a device which...
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- A.
  changes the wavelength of a laser
- B.
  changes the spot size of a laser
- C.
  changes the pulse duration of a laser
28.
The human retina is most sensitive to
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- A.
  Blue
- B.
  Green
- C.
  Infra-red
29.
Invisible light energy cannot image the human retina
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- A.
  Yes
- B.
  No
- C.
  It depends on the wavelength
30.
Power Density involves
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- A.
  wavelength
- B.
  spot diameter
- C.
  repetition rate

Quiz Outcomes

1.
You definitely need some further training!! Please go back through the book...
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2.
You are in the 'mid range'!! You probably should go through the book again!!
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You will surely benefit from our new book...
3.
You are very knowledgeable but could know more...
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You know your stuff!!! But we think you might learn more from our new book...
4.
You are in the top 5% of laser operators!! Well done.
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How well do you know lasers & IPLs now? - Quiz 2

This quiz has been designed to test your knowledge of lasers and IPL systems and some of their applications

Quiz Questions

Quiz Outcomes

How well do you know lasers &amp; IPLs now? - Quiz 2

This quiz has been designed to test your knowledge of lasers and IPL systems and some of their applications

Quiz Questions

Quiz Outcomes

How well do you know lasers & IPLs now? - Quiz 2