Photoelectric quantitative evaluation of argon laser treatment of port wine stains

Neumann, R.; Knobler, Robert; Lindmaier, A

doi:10.1111/j.1365-2133.1991.tb00430.x

Cited by 20 publications

(14 citation statements)

References 19 publications

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“…o Discussion Both instruments used in this study are new, fully portable, easy to operate and offer objective color values quickly. Recent studies actually report the usefulness of a tristimulus colorimeter in the study of the quantitative evaluation of ultraviolet(UV)-induced erythe ma and tanning [1,5,6], intensity of irritant or allergic dermatitis [2,4], skin blanching induced by topical corticosteroid [7,8] and argon laser treatment of port wine stains [9].…”

Section: Resultsmentioning

confidence: 99%

Comparison of Narrow-Band Reflectance Spectrophotometric and Tristimulus Colorimetric Measurements of Skin Color

Takiwaki¹,

Overgaard²,

Serup³

1994

Skin Pharmacol Physiol

104

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Two types of portable reflectance instruments, tristimulus colorimeters (Chroma Meter CR-200®) and narrow-band spectro-photometers (Dermaspectrometer®), have recently become available for the quantification of skin color. In order to know the difference and the relationship between the different color systems, the CIE L*a*b* system and the erythema melanin (E/M) indices, respectively, adopted by the two, the variations in skin color were measured at 23 different anatomical sites of 10 healthy Caucasian male subjects. The reddish tint of the skin color of the face, palm and sole was readily detected by either of them in the increase in the a* value or in the E index, and a strong linear correlation (r = 0.92, p < 0.001) was noted between the two values. The fair color appearance of the trunk was detected in the high L* value and in the low M index, but the correlation between the two was much less significant (r = -0.56, p < 0.001). Although the mean b* values were highest in the trunk, they are significantly lower on the non-light-exposed side than those on the light-exposed side of the arm. The correlation between the b* value and the M index was weak.

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Section: Resultsmentioning

confidence: 99%

Comparison of Narrow-Band Reflectance Spectrophotometric and Tristimulus Colorimetric Measurements of Skin Color

Takiwaki¹,

Overgaard²,

Serup³

1994

Skin Pharmacol Physiol

104

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show abstract

“…The shape of the necrotic area was similar on all sections of all biopsies (Figs. [4][5][6][7][8]. Because of the different laser parameters, the extent varied accordingly.…”

Section: Untreated Normal Skin and Port-winementioning

confidence: 99%

Histochemical evaluation of the coagulation depth after argon laser impact on a port‐wine stain

et al. 1991

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A two-step excisional treatment of a port-wine stain (PWS) on the back of a 43-yr-old female patient was performed. Immediately before the first surgical treatment, two corresponding series of argon laser impacts were performed, each on one PWS half. Different laser parameters with irradiances ranging from 95 to 382 W/cm2 and energy fluences ranging from 19 to 114,6 J/cm2 were used. Laser spots on the first part ot be excised were biopsied 10 min after laser treatment and prepared for histochemical analysis by staining with nitro blue tetrazolium chloride (NBTC). Reduction of this redox dye by nicotinamide adenine dinucleotide diaphorase (NADH-diaphorase) leads on frozen tissue sections to an intense blue precipitate. The activity of NADH-diaphorase subsides immediately upon cell damage. All vital epidermal and dermal cells presented a dense blue granular pigment in their cytoplasm, sparing the nuclei. Laser induced arc-shaped epidermal and dermal necrosis did not stain, showing a clear demarcation from surrounding vital tissue. The depth of the thermal injury ranged from 0.28 to 0.45 mm; it did not correlate with the chosen fluences. With these penetration depths, the vast majority of PWS vessels was affected. Assessment of the remaining part of the PWS 8 months later yielded blanching of all laser-treated areas. With the NBTC method, an accurate definition of laser-induced tissue damage is feasible. It could be shown that the exposure time is the most relevant parameter influencing the penetration depth.

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“…In dermatology the description of the color of a lesion is of great importance [Neumann et al, 1991]. However, visual evaluation of erythemal intensity is subjective and less precise, especially regarding the comparison between the intensities of developed erythema [Nose and Tsurumi, 1993].…”

Section: Introductionmentioning

confidence: 99%

Percutaneous absorption and skin erythema: Quantification of capsaicin and its synthetic derivatives from gels incorporated with benzalkonium chloride by using non-invasive bioengineering methods

et al. 1997

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Photoelectric quantitative evaluation of argon laser treatment of port wine stains

Cited by 20 publications

References 19 publications

Comparison of Narrow-Band Reflectance Spectrophotometric and Tristimulus Colorimetric Measurements of Skin Color

Comparison of Narrow-Band Reflectance Spectrophotometric and Tristimulus Colorimetric Measurements of Skin Color

Histochemical evaluation of the coagulation depth after argon laser impact on a port‐wine stain

Percutaneous absorption and skin erythema: Quantification of capsaicin and its synthetic derivatives from gels incorporated with benzalkonium chloride by using non-invasive bioengineering methods

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