Investigation of endovenous laser ablation of varicose veins in vitro using 1.885-μm laser radiation

Belyaev, A. N.; Чабушкин, А. Н.; Khrushchalina, S.A.; Кузнецова, О. А.; Lyapin, A.A.; Romanov, Konstantin N; Ryabochkina, P. A.

doi:10.1007/s10103-016-1877-z

Cited by 28 publications

(6 citation statements)

References 31 publications

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“…The speed of the ablation catheter pullback motion is about (0.5-3 mm/s). [31][32][33][34][35][36][37] Two different frame rates of PA images were acquired. A frame rate of 500 FPS (PA) was used for fast imaging, and a frame rate of 30 FPS (PA) was used for the existing imaging system.…”

Section: Evaluating the Feasibility Of The Fast Us/pa-guided Ablation System For Catheter Tip Trackingmentioning

confidence: 99%

Efficacy of High Temporal Frequency Photoacoustic Guidance of Laser Ablation Procedures

et al. 2021

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Inaccurate placement of the ablation catheter and the inability to monitor the real-time temperature within the tissue of interest such as veins curbs the treatment efficacy of laser ablation procedures during thermal therapies. Our previous studies have validated the efficacy of photoacoustic (PA) imaging during endovenous laser ablation (EVLA) procedures. However, the PA-guided therapies suffer from low temporal resolution, due to the low pulse repetition rates of pulsed lasers, which could cause a problem during fast catheter motion and rapid temperature changes. Herein, to enhance the accuracy and sensitivity for tracking the ablation catheter tip and temperature monitoring, we proposed to develop a high frame rate (500 Hz), combined ultrasound (US), and PA-guided ablation system. The proposed PA-guided ablation system was evaluated in a set of ex vivo tissue studies. The developed system provides a 2 ms temporal resolution for tracking and monitoring the ablation catheter tip’s location and temperature, which is 50 times higher temporal resolution compared to the previously proposed 10 Hz system. The proposed system also provided more accurate feedback about the temperature variations during rapid temperature increments of 10°C per 250 ms. The co-registered US and PA images have an imaging resolution of about 200 μm and a field of view of 45 × 40 mm2. Tracking the ablation catheter tip in an excised tissue layer shows higher accuracy during a relatively fast catheter motion (0.5–3 mm/s). The fast US/PA-guided ablation system will potentially enhance the outcome of ablation procedures by providing location and temperature feedback.

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Section: Evaluating the Feasibility Of The Fast Us/pa-guided Ablation System For Catheter Tip Trackingmentioning

confidence: 99%

Efficacy of High Temporal Frequency Photoacoustic Guidance of Laser Ablation Procedures

et al. 2021

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“…Solid-state lasers at 2 µm have a variety of applications in surgery, materials processing, environmental monitoring, gas detection and as the pump sources of mid-IR optical parametric oscillators (OPOs) and generators [1][2][3][4][5][6]. Tm 3+ -or Ho 3+ -ions are the main doping ions for the laser crystals and ceramics at 2 µm [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

High efficiency in-band pumped Tm- and Ho-doped 2-μm solid-state lasers

Антипов

2023

J. Phys.: Conf. Ser.

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The expansion of laser sources operating at 2-3 μm is motivated in large by strong absorption in atmospheric gases, liquid water, and plastics, critical for applications in remote sensing, soft and hard tissue surgery, and materials processing. 2-μm novel solid-state lasers based on Tm3+-doped ceramics (Lu2O3 or Y2O3) or YAP crystals in-band pumped by a fiber laser at 1670 nm are presented in this report. CW, actively or passively Q-switch operations of the Tm3+-doped lasers are described. The Tm3+ laser characteristics are compared with parameters of an in-band fiber-laser-pumped Ho3+:YAG laser. The 2-μm output of the lasers are used to pump the Cr2+-doped ZnSe or CdSe crystals. The lasers based on the Tm3+:Lu2O3 ceramics and the Tm3+:YAP crystal are also used as pump sources for mid-IR optical parametric oscillators (OPOs) or second-harmonic generators (SHGs). The high-efficiency oscillations are obtained at 3.8-4.1 μm in the OPOs based on a fun-out PPMg:LN; the SHGs provided the repetitively-pulsed radiations at 970-983 nm.

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“…Regarding their applications, infrared laser sources are currently used in many technological applications [ 60 ], such as material processing [ 61 ], remote sensing [ 62 , 63 ], gas monitoring [ 60 ], medicine [ 64 , 65 ], and optical communication systems. All are triggered by two important properties of the infrared spectral range: first, many roto-vibrational absorption lines of various molecules are located in this range, known as the molecular fingerprint region; secondly, it contains several atmospheric transparency windows [ 66 ].…”

Section: Introductionmentioning

confidence: 99%

Achievements and Future Perspectives of the Trivalent Thulium-Ion-Doped Mixed-Sesquioxide Ceramics for Laser Applications

Pirri

Maksimov

et al. 2022

Materials

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This paper is devoted to reviewing the latest results achieved in solid-state lasers based on thulium-doped mixed-sesquioxide ceramics, i.e. (Lu,Sc,Y)2O3. The near- and mid-infrared regions are of interest for many applications, from medicine to remote sensing, as they match molecular fingerprints and cover several atmospheric transparency windows. These matrices are characterized by a strong electron–phonon interaction—which results in a large splitting of the ground state—and by a spectral broadening of the optical transition suitable for developing tunable and short-pulse lasers. In particular, the manuscript reports on the trivalent thulium laser transitions at 1.5, 1.9, and 2.3 µm, along with the thermal and optical characteristics of the (Lu,Sc,Y)2O3 ceramics, including the fabrication techniques, spectroscopic and optical properties, and laser performances achieved in different pumping regimes, such as continuous-wave (CW), quasi-CW, and pulsed modes. A comparison of the performance obtained with these mixed-sesquioxide ceramics and with the corresponding crystals is reported.

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Investigation of endovenous laser ablation of varicose veins in vitro using 1.885-μm laser radiation

Cited by 28 publications

References 31 publications

Efficacy of High Temporal Frequency Photoacoustic Guidance of Laser Ablation Procedures

Efficacy of High Temporal Frequency Photoacoustic Guidance of Laser Ablation Procedures

High efficiency in-band pumped Tm- and Ho-doped 2-μm solid-state lasers

Achievements and Future Perspectives of the Trivalent Thulium-Ion-Doped Mixed-Sesquioxide Ceramics for Laser Applications

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