Presidential Greeting - American Society for Laser Medicine and ...

36 American Society for Laser Medicine and Surgery Abstracts
quantitatively assess hair reduction and side effects after using
low fluence high repetition rate 810 nm diode laser versus high
fluence low repetition rate 1,064 nm Nd:Yag laser and to
determine efficacy at 1- and 6-month follow-up after treatment.
Study: This is a prospective single-center, bilaterally paired-,
blinded-, randomized-comparison study. Fifty female volunteers
were recruited to the study. The volunteers were randomly
treated with low fluence high repetition rate 810 nm diode laser on
one side of their axilla and high fluence low repetition rate
1,064 nm Nd:YAG laser on the other side of their axilla. They
received five treatments at 4 weeks interval. Axillary hair count
and patient satisfaction rating were measured at baseline, 1-, and
6-month follow-up after complete treatment protocol. Treatment
time of each laser and pain score were also rated at 1st treatment.
Results: Until now, the study has not yet been completed. All
subjects received five treatments and attended 1-month follow-up
visit. Forty-one of the 51 subjects continued with the study
protocol. Percentage of axillary hair reduction at 1-month followup
visit after receiving 810 nm diode and 1,064 nm Nd:YAG laser
treatment were 71.0 21.1%, and 82.3 18.0%, respectively.
There was a significant difference in hair reduction and pain score
between both laser treatment (P ¼ 0.003, and P < 0.001,
respectively). However, there was no statistically significance
difference in patient satisfaction rating and treatment time
(P ¼ 0.12 and P ¼ 0.09). Side effects were mild and limited to
transient erythema and swelling. The final results will be
presented in the meeting.
Conclusion: Both low fluence high repetition rate 810 nm diode
laser and high fluence low repetition rate 1,064 nm Nd:YAG laser
are safe and effective procedures for hair removal. High fluence
low repetition rate 1,064 nm Nd:YAG laser is superior in hair
reduction. However, low fluence high repetition rate 810 nm diode
laser is less painful. And long-term follow-up is needed.
INTERNATIONAL
EXPERIENCE IN LASERS
IN DERMATOLOGY
#113
GUIDELINES ON THE SAFETY OF LIGHT-BASED
HOME-USE DEVICES FROM THE EUROPEAN
SOCIETY FOR LASER DERMATOLOGY
Godfrey Town, Caerwyn Ash, Christine Dierickx,
Merete Haedersdal, Klaus Fritz
University of Wales, Global Academy, Swansea Metropolitan
University, Swansea, United Kingdom; University Hospital
Ghent, Ghent, Belgium; Massachusetts General Hospital, Boston,
MA, Copenhagen, Denmark; European Society of Laser
Dermatology, Landau, Germany
Background: In the past 2 years since their first introduction,
there has been a rapid proliferation of light-based hair removal
and wrinkle treatment devices intended for home-use. In Europe,
sales already run into several tens of thousands of units with
multi-national companies such as Phillips, Remington and
Alliance Boots entering the market. This review is intended to
inform healthcare professionals about home-use light-based
technology and influence manufacturers wishing to sell in Europe
to adopt ‘best practice’. The study considers the risks to the eyes
and skin from optical radiation both to the consumer and persons
in the vicinity of the user.
Study: The review draws upon a preliminary study by two of the
authors investigating the technical performance of a range of
professional and home-use devices tested with particular focus
on recognized critical parameters for the safe and effective
use of light-based technology in hair removal and wrinkle
treatment.
Conclusion: There is an urgent need for regulation of intense
pulsed light and LED devices as well as lasers, which will include
manufacturing standards for both professional and home-use
devices intended for hair removal, treatment of alopecia, wrinkle
treatment, skin tone and texture, etc.
#114
INVESTIGATION AND DEVELOPMENT OF A
MEASUREMENT TECHNIQUE FOR THE SPATIAL
ENERGY DISTRIBUTION OF HOME-USE INTENSE
PULSED LIGHT SYSTEMS
Gareth Thomas, Caerwyn Ash,
Richard Hugtenburg, Michael Kiernan
Godfrey Town, Swansea University; University of Wales,
Global Academy, Swansea, United Kingdom
Background: The current annual global market for domestic
intense pulse light (IPL) hair removal has been estimated at US
$1 billion and continues to grow. It is widely recognised that there
are five key technological parameters to consider in cutaneous
photo therapy, namely wavelength, energy density, pulse
duration, spot size and spatial distribution. Uneven energy
distribution in the treatment area can result in over or under
treatment of the treated area, thus causing dissatisfaction to the
patient.
Study: This study investigates a method in measuring and
analysing spatial distributions of five commercially available
home-use IPL systems as there is no quantitative method to
conduct and compare spatial profiles. Using a CCD camera and a
phosphorescent screen to extend the pulse duration, averaged
time frames were analysed in Matlab software where dark
reference frames were taken to minimise noise. Normalised for
energy, 3-D graphical images of the data are presented to show
the spatial profile of five commercially available IPL systems.
Numerical analysis of the data was completed by two methods,
arithmetical mean roughness (Ra) and path difference (Pd) at 80%
and 13.5% of maximum value.
Results: One system has both the lowest Ra value on the 80%
border and the lowest Ra value on the 13.5% border. Two systems
have obviously poor distribution of spatial energy. Such numerical
analysis provides valuable information on treatment performance
previously unseen.
Conclusion: This study recorded two systems with clear uneven
distribution of energy across the treatment area. This could result
in over and/or under treatment at the claimed energy density that
might produce blistering, hyper pigmentation or
hypopigmentation in areas of increased fluence and paradoxical
hair growth or limited effectiveness in areas of reduced fluence.
Such clear unevenness in spatial distribution requires the
consumer to overlap treatment thus increasing treatment time
and user dissatisfaction.