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Proceedings Paper

Lesion size produced by interstitial laser coagulation: cylindrical diffuser versus bare-tip fiber
Author(s): Joos Heisterkamp; Richard van Hillegersberg; Jan N. M. IJzermans
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Paper Abstract

Interstitial laser coagulation is a new method of localized tissue destruction that may be used to eliminate solid tumors, such as hepatic metastases, an in-vitro study was performed to compare a cylindrical diffusing-tip (length 2 cm) with a bare-tip fiber. Fiber ends were positioned between two porcine liver slabs (37 degrees Celsius) and Nd:YAG laser light (1064 nm) was guided through either fiber with an output of 3 - 9 W and exposure times of 6 - 18 minutes. Lesions produced by the cylindrical diffuser-tip were significantly larger and more predictable at a higher laser output (greater than 6 W). With the diffuser tip lesions up to 36 mm in length and 23 mm in width could be produced at 7 W and 9 min without any central charring. Lesions produced with the bare-tip fiber were up to 32 mm in length and 20 mm in width at 6 W and 9 min with massive charring. These results indicate that at optimal laser settings the diffuser of 2 cm length produces a larger coagulation volume than a point light source and that charring should be avoided in interstitial laser coagulation.

Paper Details

Date Published: 19 January 1996
PDF: 7 pages
Proc. SPIE 2623, Medical Applications of Lasers III, (19 January 1996); doi: 10.1117/12.230336
Show Author Affiliations
Joos Heisterkamp, Erasmus Univ. and Univ. Hospital Rotterdam (Netherlands)
Richard van Hillegersberg, Erasmus Univ. and Univ. Hospital Rotterdam (Netherlands)
Jan N. M. IJzermans, Erasmus Univ. and Univ. Hospital Rotterdam (Netherlands)


Published in SPIE Proceedings Vol. 2623:
Medical Applications of Lasers III
Stephen G. Bown; Herbert J. Geschwind; Raimund Hibst; Frederic Laffitte; Giulio Maira; Roberto Pini; Hans-Dieter Reidenbach; Hans H. Scherer; Pasquale Spinelli, Editor(s)

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