Comparison of 810 nm and 1064 nm wavelengths for interstitial laser photocoagulation in rabbit brain

Wyman, D. R.; Schatz, Stanley W.; Maguire, John A.

doi:10.1002/(sici)1096-9101(1997)21:1<50::aid-lsm8>3.0.co;2-x

Cited by 14 publications

(11 citation statements)

References 16 publications

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“…Early animal work with 810‐nm diode lasers has found them capable of deep, extensive thermal damage similar to Nd:YAG lasers because of poor tissue absorption and therefore unpredictable amounts of reflection or deep absorption with scatter causing widespread thermal injury. 158 …”

Section: History Of Stapes Surgerymentioning

confidence: 99%

Laser‐Assisted Endoscopic Stapedectomy: A Prospective Study

Poe

2000

The Laryngoscope

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Objective: To improve the techniques required to perform a stapedotomy without prosthesis (stapedioplasty). Study Design: New infrared lasers were evaluated for potential use in otological surgery in guinea pigs. A prospective human trial of 34 primary stapes operations using the Argon ion laser was performed, with 11 stapedioplasties and 23 conventional stapedotomies as controls. Methods: Laser-tissue interactions were evaluated for temporal bone and live guinea pig tissues, measuring crater histology and labyrinthine temperature elevations. Patients undergoing stapedioplasty had Argon ion laser cuts with endoscopic assistance made in the anterior crus and footplate to mobilize the posterior segment of the stapes while the anterior portion remained fixed. Results: Diode laser (808-nm) vaporization craters and temperature elevations in the vestibule were suitable for clinical use. Overall, stapedioplasty patients' hearing was improved with air-bone gap closure to a mean of 8.3 dB (SD ؎ 9.8 dB). Conclusions: Patients with anterior footplate otosclerosis are candidates for stapedioplasty preserving the annular ring and stapes tendon and eliminating prosthesis complications. High-resolution small endoscopes, coupled with Argon ion or diode lasers promise to improve stapes visualization, enhancing the ability to perform minimally invasive surgery on the stapes footplate.

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Section: History Of Stapes Surgerymentioning

confidence: 99%

Laser‐Assisted Endoscopic Stapedectomy: A Prospective Study

Poe

2000

The Laryngoscope

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“…For deposition of optical energy, Q L ‫ס‬ a . Note that Q L is the term that links the mathematical descriptions of optical propagation (1) and heat transfer (2).…”

Section: Theorymentioning

confidence: 99%

“…Small unresectable tumors can be destroyed thermally using interstitial laser photocoagulation [1,2]. This minimally invasive technique involves coupling continuous-wave laser energy to optical fibers implanted in a tumor volume.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modeling of interstitial laser photocoagulation: Implications for lesion formation in liver in vivo

Whelan

Wyman

1999

Lasers Surg. Med.

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Background and Objective Interstitial Laser Photocoagulation (ILP) is a minimally invasive cancer treatment technique, whereby optical energy from implanted optical fibers is used to therapeutically heat small, solid tumors. In this work, the potential of ILP without tissue charring is investigated. Study Design/Materials and Methods Optical diffusion and bioheat transfer equations were used to develop dynamic models of interstitial laser heating in liver in vivo. Modifications in the optical properties due to tissue coagulation (T ⩾ 60°C) were incorporated into the physical description. In addition, the effect of three different blood perfusion patterns on temperature distributions was explored. Model‐predicted temperatures were used as an index for thermal damage based on an accumulated temperature injury (Arrhenius) model. Thermal damage dimensions were determined with tissue temperatures constrained to remain below 100°C, so as to minimize the potential for tissue charring and smoke production. Results The model predicts that increases in scattering due to coagulation and choice of perfusion pattern affect substantially thermal damage dimensions. The results indicate that, for single fiber ILP at 2.55 W for 600 s, the maximum achievable thermal damage diameter in liver, without charring, is 9.6 mm. In addition, ILP performed with high‐low power ramping may have an advantage over constant power treatments, in that, larger volumes of thermal damage can be realized earlier in an irradiation. Conclusions For ILP performed with a single spherical emitting fiber, optimal irradiation parameters exist such that thermal lesions in liver up to approximately 10 mm in diameter can be induced while the maximum tissue temperature remains below 100°C, avoiding tissue charring. Lasers Surg. Med. 24:202–208, 1999. © 1999 Wiley‐Liss, Inc.

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“…A number of previous studies have explored the use of 1,064-nm Nd:YAG and 810-nm diode lasers for LITT [1,[19][20][21]. At these wavelengths, water (which is a major component of tissue) exhibits an absorption coefficient of 0.144 cm À1 and 0.0219 cm À1 , respectively [22], and therapies may last up to 30 minutes in some cases [10,13,23,24].…”

Section: Discussionmentioning

confidence: 99%

“…Laser interstitial thermal therapy (LITT) is a particularly promising technique since small and flexible applicators are readily available, and the means of heating may be controlled to some extent by selection of an appropriate source wavelength and/or applicator [1,2]. However, for effective LITT treatment of focal malignant tumors, accurate prediction of achieved thermal damage is required.…”

Section: Introductionmentioning

confidence: 99%