1
|
Wang YJ, Chang CC, Wu YH, Huang L, Chen IL, Shih YC, Cheng H, Shen JW, Lu ME, Chiang HM, Lin BS. Activated melanocytes and senescent collagen fibers predict laser-treated melasma outcomes: An optical biopsy-based prospective cohort study. Photodiagnosis Photodyn Ther 2025:104648. [PMID: 40419099 DOI: 10.1016/j.pdpdt.2025.104648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2025] [Revised: 05/22/2025] [Accepted: 05/23/2025] [Indexed: 05/28/2025]
Abstract
BACKGROUND Melasma Area and Severity Index (MASI) score only assesses the pigmentation rather than photoaging. Picosecond alexandrite laser (PAL) with diffractive lens array (DLA) can improve photoaging and has been approved for melasma treatment. Prediction for post-laser outcome is limited. OBJECTIVE To in vivo compare the photoaging milieu altered by a PAL with DLA in melasma lesions and adjacent perilesions, and to delineate the predictive factors for outcomes. METHODS An optical biopsy with cellular resolution full-field optical coherence tomography (CRFF-OCT) was set up to evaluate the dynamic changes. Quantification was performed with the computer-aided detection (CADe) system. RESULTS The mean MASI score decreased significantly (p<0.001) in 12 of 15 patients but increased in the other three. An optical biopsy of 74,340 images showed the numbers of activated melanocytes and melanophages were significantly reduced post laser, and the basement membrane (BM) was repaired in melasma lesions, while basal lightening was noted in perilesions. The pre-treatment presence of activated melanocytes was associated with a high regional MASI score (p=0.013), while the senescent collagen fibers and activated melanocyte patterns were associated with less MASI score improvement (p=0.005). Senescent collagen fibers (p=0.002) and baseline BM damage(p=0.001) were strongly correlated to post-treatment melanophages. The baseline MASI score was not associated with activated melanocyte status or treatment outcomes. CONCLUSION Optical biopsy using CRFF-OCT revealed that patterns of activated melanocytes and senescent collagen fibers can serve as predictive markers for post-laser treatment outcomes. The photoaging characteristics of melasma were improved through the reduction of activated melanocytes and the repair of the BM.
Collapse
Affiliation(s)
- Yen-Jen Wang
- Department of Dermatology, MacKay Memorial Hospital, Taipei, Taiwan; Department of Cosmetic Applications and Management, MacKay Junior College of Medicine, Nursing, and Management, New Taipei City, Taiwan
| | - Chang-Cheng Chang
- Department of Cosmeceutics, China Medical University, Taichung, Taiwan; Institute of Imaging and Biomedical Photonics, National Yang Ming Chiao Tung University, Tainan, Taiwan; School of medicine, College of medicine, China medical university, China Medical University Hospital, Taichung, Taiwan; Aesthetic medical center, China Medical University Hospital, Taichung, Taiwan.
| | - Yu-Hung Wu
- Department of Dermatology, MacKay Memorial Hospital, Taipei, Taiwan; Department of Medicine, Mackay Medical College, New Taipei City, Taiwan
| | - Ling Huang
- Apollo Medical Optics Ltd., Taipei, Taiwan
| | | | | | | | - Jia-Wei Shen
- Department of Cosmeceutics, China Medical University, Taichung, Taiwan
| | - Meng-En Lu
- Department of Cosmeceutics, China Medical University, Taichung, Taiwan
| | - Hsiu-Mei Chiang
- Department of Cosmeceutics, China Medical University, Taichung, Taiwan
| | - Bor-Shyh Lin
- Institute of Imaging and Biomedical Photonics, National Yang Ming Chiao Tung University, Tainan, Taiwan
| |
Collapse
|
2
|
Zhu J, Chang R, Han Y, Xi Q, Jiang S, Shang Y, Lyu D, Yu W, Lin X. Comparison of Intense Pulsed Light With Nonablative Fractional Laser and Picosecond Alexandrite Laser With Diffractive Lens Array for Noninvasive Facial Rejuvenation. Lasers Surg Med 2025; 57:195-203. [PMID: 39950332 DOI: 10.1002/lsm.23879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2024] [Revised: 10/21/2024] [Accepted: 12/26/2024] [Indexed: 02/22/2025]
Abstract
BACKGROUND Both nonablative fractional (NAFL) laser combined with intense pulsed light (IPL) and picosecond alexandrite laser (PSAL) with diffractive lens array (DLA) have been documented for their efficacy in facial rejuvenation. OBJECTIVE To observe the safety and efficacy of PSAL-DLA and IPL-NAFL in the rejuvenation of Chinese individuals. METHODS Each subject (n = 18) received three treatments on half of their face, with 1-month interval between treatments. One side of the face was randomly treated with PSAL-DLA, and the other side with IPL-NAFL. Quantitative data of wrinkles, pores, brown spots, and red areas were calculated using the VISIA-CR imaging system 3 months after the final treatment. Secondary outcomes included a 10-point VAS for patient-rated pain sensation, incidence of post-inflammatory hyperpigmentation (PIH), erythema and edema, and overall satisfaction. Adverse events were recorded after each treatment and at each follow-up. RESULTS A total of 17 Chinese female patients aged 28.2 ± 4.3 years completed the study and the 3-month follow-up. The IPL-NAFL side showed a statistically significant improvement in pores compared to baseline (p < 0.05); the PSAL-DLA side showed a statistically significant improvement in brown spots compared to baseline (p < 0.01). Compared to PSAL-DLA, the improvement in enlarged pores was better for IPL-NAFL (81.8 ± 128.1 vs. 20.8 ± 132.4, p < 0.01). In terms of pain, IPL-NAFL was more painful than PSAL-DLA (6 ± 1 vs. 4 ± 1, p < 0.01), a longer recovery time for erythema and edema (5 ± 1 vs. 2 ± 1, p < 0.001), and a higher incidence of PIH (58.8% vs. 23.5%, p < 0.05). Patient satisfaction was higher for PSAL-DLA than for IPL-NAFL (3 ± 1 vs. 4 ± 0.5, p < 0.01). CONCLUSION Our study results indicated that both IPL-NAFL and PSAL-DLA could improve the photoaging, but within the same number of treatments, IPL-NAFL was slightly more effective for enlarged pores than PSAL-DLA, while PSAL-DLA was more effective for brown spots than IPL-NAFL. Patients were more satisfied with PSAL-DLA, with a shorter postoperative recovery period and a lower incidence of PIH.
Collapse
Affiliation(s)
- Jiafang Zhu
- Department of Laser and Aesthetic Medicine, affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Rui Chang
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
| | - Yue Han
- Department of Laser and Aesthetic Medicine, affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Qianwen Xi
- Department of Assisted Reproduction, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine Shanghai, People's Republic of China
| | - Shutian Jiang
- Department of Assisted Reproduction, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine Shanghai, People's Republic of China
| | - Ying Shang
- Department of Laser and Aesthetic Medicine, affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Dongze Lyu
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
| | - Wenxin Yu
- Department of Laser and Aesthetic Medicine, affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiaoxi Lin
- Department of Laser and Aesthetic Medicine, affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
- Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
| |
Collapse
|
3
|
Tao J, Hashemi DA, Bajaj S, Wang JV, Geronemus RG. Paired Treatment Using Radiofrequency Microneedling and 755-nm Picosecond Laser With Fractionated Lens Array for Facial Rejuvenation. Dermatol Surg 2024; 50:1163-1166. [PMID: 38924506 DOI: 10.1097/dss.0000000000004302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2024]
Abstract
BACKGROUND Patients frequently complain about fine lines, wrinkles, dyschromia, and photoaging, for which lasers and energy-based devices can treat each of these. Pairing various devices in a single treatment session can be safe and effective, but different technologies, mechanisms, histologies, parameters, and techniques must be considered. OBJECTIVE To examine the utility of a paired treatment regimen using radiofrequency microneedling and 755-nm picosecond laser with fractionated lens array to improve the clinical appearance of facial wrinkles and photoaging. MATERIALS AND METHODS A prospective clinical study investigated this paired treatment regimen using 4 monthly sessions. RESULTS Twenty-five subjects were enrolled, while 18 subjects completed 3-month follow-up. The mean age was 54 years, and 92% were women. Fitzpatrick Skin Types I to IV were represented. Assessments compared baseline with the 3-month follow-up. Two of 3 blinded reviewers agreed in identifying pretreatment and post-treatment photographs for 94.4% of cases. For physician Global Aesthetic Improvement Scale, 100% of subjects had clinical improvement. Overall, 88.9% of subjects were considered to be satisfied with their treatment. No serious or unanticipated adverse events occurred. CONCLUSION Paired treatment using radiofrequency microneedling and 755-nm picosecond laser with fractionated lens array can safely and effectively improve facial wrinkles and photoaging.
Collapse
Affiliation(s)
- Joy Tao
- All authors are affiliated with the Laser & Skin Surgery Center of New York, New York, New York
| | | | | | | | | |
Collapse
|
4
|
Ninghua L, Cao L, Song N, Zhang J. Evaluation of 755-nm Picosecond Alexandrite Laser With a Focus Lens Array for the Treatment of Enlarged Facial Pores. J Craniofac Surg 2024; 35:1552-1554. [PMID: 38819149 DOI: 10.1097/scs.0000000000010379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2024] [Accepted: 05/06/2024] [Indexed: 06/01/2024] Open
Abstract
OBJECTIVES This study aims to evaluate the use of 755-nm picosecond alexandrite laser with a focus lens array to treat facial pores. METHODS Laser treatment was performed on 129 patients between January 2021 and October 2022. VISIA imaging system was used for photographic assessments, the total average number and pore index was calculated, the physicians' assessment score and patient satisfaction score were collected, and the incidence of disadvantage effects was also documented. RESULTS The mean patient age was 35.2±6.4 years (21-45 y). The total average number of facial pores was 1614.1±412.8, and the total average number decreased to 1262.6±356.2 three months after the last treatment. The pretreatment baseline of pore index was 26.1±4.5, while the pore index was 21.3±3.7 three months after the last treatment. The physicians' assessment score was 2.7 on the 0-to-4 scale, and patient satisfaction score was 3.5 on the 1-to-5 scale. There were no adverse events, such as hyperkeratosis, scarring, and hypo-or hyperpigmentation. CONCLUSIONS 755-nm picosecond alexandrite laser with a focus lens array was safe and effective in the treatment of facial pores with relatively few unanticipated adverse events. LEVEL OF EVIDENCE Level IV-observational study without controls.
Collapse
Affiliation(s)
- Liu Ninghua
- Department of Facial Plastic and Reconstructive Surgery, Eye & ENT Hospital of Fudan University, Shanghai
| | - Luhong Cao
- Department of Otolaryngology Head and Neck Surgery, Sichuan Academy of Medical Science, Sichuan Provincial People's Hospital, Chengdu, China
| | - Nan Song
- Department of Facial Plastic and Reconstructive Surgery, Eye & ENT Hospital of Fudan University, Shanghai
| | - Jing Zhang
- Department of Facial Plastic and Reconstructive Surgery, Eye & ENT Hospital of Fudan University, Shanghai
| |
Collapse
|
5
|
Shi J, Zeng Q, Wang P, Chang Q, Huang J, Wu M, Wang X, Wang H. A novel chlorin e6 derivative-mediated photodynamic therapy STBF-PDT reverses photoaging via the TGF-β pathway. Photodiagnosis Photodyn Ther 2023; 41:103321. [PMID: 36738905 DOI: 10.1016/j.pdpdt.2023.103321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/01/2023] [Accepted: 02/01/2023] [Indexed: 02/05/2023]
Abstract
OBJECTIVE Photoaging is characterized by wrinkles in the skin and the deterioration of the skin barrier function, mainly caused by long-term exposure to ultraviolet (UV) radiation. Photodynamic therapy (PDT) has been shown to treat photoaging. The novel photosensitizer ShengTaiBuFen(STBF) is a derived substance of Chlorin e6(Ce6) that can exert photodynamic effects directly. In this study, we investigated the availability and the mechanism of STBF-PDT in the treatment of photoaging. METHODS Fluorophotometer was used to determine therapeutic parameters for in vivo experiments. Camera photographs, dermoscopy, HE and Masson staining, skin pH, trans epidermal water loss (TEWL), epidermal water content, and sebum testing were used together to evaluate the results of the treatment. Dark toxicity and therapeutic parameters for in vitro experiments were determined by CCK8 analysis. Scratch assay was used to identify the cell migration of STBF-PDT on HaCaT cells. qPCR and Western blot were used to evaluate the TGF-β/Smad signaling pathway in human dermal fibroblast (HDF) cells. RESULTS We investigated the optimal STBF concentration and time of incubation in vivo and in vitro experiments. STBF-PDT improved the skin phenotype of photoaged mice. The skin of photoaged mice treated with 80 J/cm2 STBF-PDT became smooth, while skin flakes were reduced. The epidermis of STBF-PDT-treated mice was thinner, and the cells were neatly arranged, with increased dermal collagen. In vitro, STBF-PDT promoted the migration of HaCaT cells below a light dose of 0.1 J/cm2. HDF cells co-cultured with HaCaT cells treated with low-dose STBF-PDT showed activation of the TGF-β pathway. CONCLUSION As a novel photosensitizer, STBF-mediated low-dose PDT could reverse photoaging via the TGF-β pathway.
Collapse
Affiliation(s)
- Jingjuan Shi
- Department of Dermatology, Huadong Hospital, Fudan University, Shanghai 200040, China
| | - Qingyu Zeng
- Institute of Photomedicine, Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200050, China
| | - Peiru Wang
- Institute of Photomedicine, Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200050, China
| | - Qihang Chang
- Institute of Photomedicine, Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200050, China
| | - Jianhua Huang
- Department of Dermatology, Huadong Hospital, Fudan University, Shanghai 200040, China
| | - Minfeng Wu
- Department of Dermatology, Huadong Hospital, Fudan University, Shanghai 200040, China
| | - Xiuli Wang
- Institute of Photomedicine, Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200050, China.
| | - Hongwei Wang
- Department of Dermatology, Huadong Hospital, Fudan University, Shanghai 200040, China.
| |
Collapse
|
6
|
Han HS, Hong JK, Park SJ, Park BC, Park KY. A Randomized, Prospective, Split-Face Pilot Study to Evaluate the Safety and Efficacy of 532-nm and 1,064-nm Picosecond-Domain Neodymium:Yttrium-Aluminum-Garnet Lasers Using a Diffractive Optical Element for Non-Ablative Skin Rejuvenation: Clinical and Histological Evaluation. Ann Dermatol 2023; 35:23-31. [PMID: 36750455 PMCID: PMC9905855 DOI: 10.5021/ad.22.070] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 07/07/2022] [Accepted: 10/12/2022] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND The advent of fractionated picosecond (ps) lasers has provided an opportunity to explore new ways of creating microinjuries in the skin to induce skin rejuvenation. OBJECTIVE To compare the efficacy and safety of diffractive optical element (DOE)-assisted ps neodymium: yttrium-aluminum-garnet (Nd:YAG) lasers with 532-nm and 1,064-nm wavelengths (532-nm and 1,064-nm Nd:YAG P-DOE) using a novel fractional handpiece for the treatment of photoaged skin. METHODS An ex vivo guinea pig skin experiment was performed by evaluating the histology of the skin after 532-nm Nd:YAG P-DOE irradiation. A randomized, prospective, split-face study was performed on eight subjects with 532-nm and 1,064-nm Nd:YAG P-DOE. RESULTS Based on the histological evaluation using ex vivo guinea pig skin, a reasonable safety profile and the potential to generate effective skin rejuvenation was observed using the 532-nm Nd:YAG P-DOE. Results demonstrated that both 532- and 1,064-nm Nd:YAG P-DOE were similarly effective in improving skin texture and skin pores; however, 532-nm Nd:YAG P-DOE was more effective in treating dyspigmentation. CONCLUSION At a preliminary level, this study revealed that 532-nm and 1,064-nm ps Nd:YAG lasers using DOE fractional technology may improve photoaged skin. In conclusion, 532-nm Nd:YAG P-DOE may be especially beneficial for skin with epidermal pigmentary lesions.
Collapse
Affiliation(s)
- Hye Sung Han
- Department of Dermatology, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Jun Ki Hong
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea
| | - Su Jung Park
- Department of Dermatology, Chungnam National University Sejong Hospital, Sejong, Korea
| | - Byung Cheol Park
- Department of Dermatology, College of Medicine, Dankook University, Cheonan, Korea
| | - Kui Young Park
- Department of Dermatology, Chung-Ang University College of Medicine, Seoul, Korea.
| |
Collapse
|
7
|
Zhou Y, Hamblin MR, Wen X. An update on fractional picosecond laser treatment: histology and clinical applications. Lasers Med Sci 2023; 38:45. [PMID: 36658259 PMCID: PMC9852188 DOI: 10.1007/s10103-022-03704-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 12/29/2022] [Indexed: 01/21/2023]
Abstract
Picosecond lasers have a very short pulse duration and a high peak power density. When fractional optical delivery systems are attached to picosecond lasers, they generate an array of concentrated microspots with a high fluence surrounded by areas with a low fluence. This article discusses the histologic characteristics and clinical applications of fractional picosecond laser treatment. Fractional picosecond laser produces laser-induced optical breakdown (LIOB) and laser-induced cavitation (LIC) in the epidermis and dermis respectively, and can encourage skin regeneration and dermal remodeling. It has been shown that fractional picosecond laser has a positive effect on facial photoaging, enlarged facial pores, dyspigmentation, wrinkles, and atrophic scars. Further research is still needed to confirm the benefits of fractional picosecond lasers.
Collapse
Affiliation(s)
- Yanjun Zhou
- Department of Dermatology, West China Hospital, Sichuan University, No.37 Guoxue Road, Chengdu, 610041, China
- Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Michael R Hamblin
- Laser Research Centre, Faculty of Health Science, University of Johannesburg, Doornfontein, 2028, South Africa
| | - Xiang Wen
- Department of Dermatology, West China Hospital, Sichuan University, No.37 Guoxue Road, Chengdu, 610041, China.
- Laboratory of Dermatology, Clinical Institute of Inflammation and Immunology, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu, 610041, China.
| |
Collapse
|
8
|
Liu Z, Zhou N, Zhu Z, Yi Z, Wu L, Tao J, Yang B. Objective Short-term Efficacy of Monopolar Radiofrequency Application in Facial Rejuvenation. J Cosmet Dermatol 2022; 21:5298-5300. [PMID: 35509126 DOI: 10.1111/jocd.15043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 04/12/2022] [Accepted: 05/02/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Zhenfeng Liu
- Southern Medical University Dermatology Hospital, Guangzhou, Guangdong, 510091, People's Republic of China
| | - Na Zhou
- Guangdong Medical University, Zhanjiang, Guangdong, 524023, People's Republic of China.,Southern Medical University Dermatology Hospital, Guangzhou, Guangdong, 510091, People's Republic of China
| | - Zhenlai Zhu
- Southern Medical University Dermatology Hospital, Guangzhou, Guangdong, 510091, People's Republic of China
| | - Zhen Yi
- Southern Medical University Dermatology Hospital, Guangzhou, Guangdong, 510091, People's Republic of China
| | - Linshan Wu
- Southern Medical University Dermatology Hospital, Guangzhou, Guangdong, 510091, People's Republic of China
| | - Jingjing Tao
- Southern Medical University Dermatology Hospital, Guangzhou, Guangdong, 510091, People's Republic of China
| | - Bin Yang
- Guangdong Medical University, Zhanjiang, Guangdong, 524023, People's Republic of China.,Southern Medical University Dermatology Hospital, Guangzhou, Guangdong, 510091, People's Republic of China
| |
Collapse
|
9
|
Efficacy and safety of 755-nm picosecond alexandrite laser with topical tranexamic acid versus laser monotherapy for melasma and facial rejuvenation: a multicenter, randomized, double-blinded, split-face study in Chinese patients. Lasers Med Sci 2022; 37:2879-2887. [PMID: 35501519 DOI: 10.1007/s10103-022-03566-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 04/22/2022] [Indexed: 02/05/2023]
Abstract
To compare the efficacy and safety of 755-nm picosecond alexandrite laser and topical tranexamic acid (TTA) combination therapy with laser monotherapy, for the treatment of melasma and facial rejuvenation. This multicenter, randomized, double-blinded, split-face study enrolled 37 patients who presented with melasma and photoaging. Facial halves were randomized to receive either laser and TTA combination therapy or laser monotherapy. Three treatments were delivered at 4-5 weeks intervals. Patients were followed up for 1, 3, and 6 months post-final treatment and evaluated by blinded investigators for hemi-Melasma Area and Severity Index (hemi-MASI), facial dyschromia, skin texture, laxity, and rhytids. Daily diaries rating healing progress for 7 days posttreatment and satisfaction grading were performed by all patients. Adverse events were recorded. Thirty-six patients completed the follow-up. Compared with the baseline, hemi-MASI, dyschromia, and skin texture on both halves improved significantly through the follow-up (p = 0.000). A significant difference in hemi-MASI and dyschromia between combination therapy halves and monotherapy halves was noticed at 1- and 3-month follow-ups (p < 0.05). The laser monotherapy halves displayed significantly less redness and sensitivity during the 7-day posttreatment recovery period (p < 0.05). Patients' satisfaction ratings for the combination therapy halves were higher than the monotherapy halves at 1-month follow-up (p < 0.05). No severe adverse events were observed. The picosecond alexandrite laser and TTA combination therapy demonstrated synergistic efficacy for hemi-MASI and dyschromia improvements over laser monotherapy. The optimization of the picosecond laser and TTA combination regimen needs further investigation.
Collapse
|
10
|
Moon B, An YJ, Kim YS, Lee JH, Ju BK, Jhon YM. Cavity-dumped mode-locked Alexandrite laser oscillator with 100 mJ pulses stabilized by using a double trigger system. OPTICS EXPRESS 2022; 30:3516-3523. [PMID: 35209607 DOI: 10.1364/oe.446008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
We report a mode-locked Alexandrite single pulse laser with cavity dumping. Mode locking was achieved by using an AOM and an EOM was used for Q-switching and cavity dumping. The instability of the single pulse laser energy output was reduced down to a tenth of that of the conventional single trigger system by introducing a novel double trigger system. The single pulse laser energy and pulse width were 100 mJ and 475 ps in multiple mode and 12.5 mJ and 275 ps in single mode, obtained without a laser amplifier.
Collapse
|