Advanced Laser-Tissue Interactions Course

New Advanced Laser-Tissue Interactions Course Finally, a course designed to outline a deeper understanding of the processes involved when applying laser/IPL energy to the skin.¬† Topics include: Light transport in tissues; Thermodynamic effects; Selective Photothermolysis; Tissue denaturation; Arrhenius damage integral…..   And more! Using recently developed computer models this course describes the more important processes… Continue reading Advanced Laser-Tissue Interactions Course

“Thermal Energy Levels” – my description of how RF operates in the skin

Article People kept asking me how radio frequency (RF) worked in the treatment of skin conditions. It’s pretty simple, really. It’s just electrical heating – nothing new! But, there appears to be a lot of, shall we call it, ‘mis-information’ out there, so I wrote this piece.   I’ve also included some info on ‘Heat… Continue reading “Thermal Energy Levels” – my description of how RF operates in the skin

Variable pulsewidth vascular system for dermatology | (1994) | Gustafsson | Publications | SPIE

via Variable pulsewidth vascular system for dermatology | (1994) | Gustafsson | Publications | Spie   ¬†This report describes the world’s first IPL system, developed by Morgan Gustafsson in the early 1990s. Back then we didn’t call it IPL – that name came later. Morgan approached me at an ASLMS conference after I gave a… Continue reading Variable pulsewidth vascular system for dermatology | (1994) | Gustafsson | Publications | SPIE

Calculation of the clinical parameters to effect removal of Port Wine Stains | (1990) | MJ Murphy | Publications | SPIE

via Calculation of the clinical parameters to effect removal of port wine stains | (1990) | Murphy | Publications | Spie   I started doing Monte Carlo and numerical thermal models in 1987 to try and figure out the ‘best’ set of laser parameters to treat PWS vessels. That was a long time ago! Since… Continue reading Calculation of the clinical parameters to effect removal of Port Wine Stains | (1990) | MJ Murphy | Publications | SPIE

Port Wine Stains: optical assessment and practical implementation of treatment | (1990) | MJ Murphy | Publications | SPIE

via Port wine stains: optical assessment and practical implementation of treatment | (1990) | Murphy | Publications | Spie   A report I co-authored with some colleagues in Strathclyde University describing our attempts to treat PWS with Candela’s original pulsed dye laser, back in the mid 1980s. We designed a PC-operated scanning system to deliver… Continue reading Port Wine Stains: optical assessment and practical implementation of treatment | (1990) | MJ Murphy | Publications | SPIE

Eggs, and their Arrhenius Parameters

  Eggs! Wonderful things. Scrambled, boiled, fried, curried…. Also, very useful to demonstrate the difference in the Arrhenius Parameters with different proteins. Eggs contain at least two sets of proteins – the yoke (also including some fat, vitamins, lecithin and minerals) and albumen (about 40 different proteins in the white). When we cook eggs we… Continue reading Eggs, and their Arrhenius Parameters

“Thermal Relaxation Times” – Body Language magazine

Article This article discusses our take on TRTs in a (relatively) non-mathematical way. It discusses tissue denaturation using the Arrhenius Damage Equation which describes the ‘change of state of one species into another’. It also introduces the concept of ‘Omega’ – a parameter which describes the amount of tissue damaged by the heating process. I… Continue reading “Thermal Relaxation Times” – Body Language magazine

“Thermal relaxation times: an outdated concept in photothermal treatments”

Article This is an article I co-authored with my good friend, PA Torstensson, about our interpretation of the idea that thermal relaxation times (TRTs) can be used to determine the pulse duration of laser energy when applied to skin conditions (hair, blood vessels etc). We disagree with this idea – as the title hints at!… Continue reading “Thermal relaxation times: an outdated concept in photothermal treatments”

How bright is your Q-switched Nd:YAG laser?

Have you ever wondered how bright your laser is? Given that it outputs millions of watts of light (in both 1064 and 532nm) you might imagine that it is quite bright…. Well I took a couple of videos to see for myself. Our laser safety glasses are rated at OD7 – that means if 10… Continue reading How bright is your Q-switched Nd:YAG laser?