Depth of penetration of the neodymium:yttrium-aluminum-garnet laser in the human prostate at various dosimetry

Shanberg, Allan M.; Lee, Ivan S.; Tansey, Larry A.; Sawyer, Donald E.; Rodgers, Lowell W.; Ahlering, Thomas E.

doi:10.1016/0090-4295(94)90141-4

Cited by 32 publications

(11 citation statements)

References 5 publications

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“…The maximum extension in the transverse plane (1.65 cm in radius) is nearly identical to the one (1.75 cm) noted by Shanberg et al [23] upon irradiation with Pro lase II® fiber. To lase the lateral lobe, Shanberg used a dose higher than 50,000 J, targetting extensively the whole surface.…”

Section: Discussionsupporting

confidence: 68%

“…In 1993, Bolton and Costello [18] first presented the histological results in human prostate after Nd:YAG laser ablation. In the following 2 years some further stud ies were published dealing in particular with the question of the extension of laser-induced changes [19][20][21][22][23] thus being conducive to establishment of fiber-specific, opti mal treatment modalities for some special light guides with respect to lasing time, applied energy and mode of application.…”

Section: Histomorphological Examination Following Laser Treatment In mentioning

confidence: 99%

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MRI-Correlated Morphological Changes after Nd:YAG Laser Treatment of the Human Prostate with the SideFocus® Fiber

Sulser

Jochum²,

Böni³

et al. 1997

Urol Int

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Optimal treatment parameters and appropriate methods of examination for Nd:YAG laser coagulation of the human prostate in dependence of power-setting and time using the SideFocus® side-firing delivery system have been determined. Transurethral free-beam laser coagulation was performed in 10 patients prior to planned radical prostatectomy or cystoprostatectomy. Thereof, 6 patients underwent transperitoneal laparoscopic lymphadenectomy and laser coagulation of the prostate between 4 and 9 days prior to open surgery. These same patients had undergone MRI examination with an endorectal coil during staging and prior to radical prostatectomy. Depth and volume of coagulated prostatic tissue of a 4-quadrant laser application were measured at power-settings of 40 W/90 s and 60 W/60 s. There was no difference in volume coagulation between the two treatment modalities. In contrast there was a significant difference in volume coagulation between those prostates removed at 4–9 days and those removed at 60–210 min after laser coagulation. In histological and MRI examination, however, there was a strong correlation with view to coagulation volume in histological and MRI examination. Using the SideFocus® side-firing laser fiber, both treatment modalities showed comparable volume coagulation. Laser-induced changes are conclusively discernible by 4 days, MRI examination with an endorectal coil thus being perfectly suitable for assessment.

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Section: Discussionsupporting

confidence: 68%

Section: Histomorphological Examination Following Laser Treatment In mentioning

confidence: 99%

MRI-Correlated Morphological Changes after Nd:YAG Laser Treatment of the Human Prostate with the SideFocus® Fiber

Sulser

Jochum²,

Böni³

et al. 1997

Urol Int

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“…VLAP can be performed using a noncontact technique [7, 8]causing deep coagulation necrosis, and by contact surface vaporization [9, 10]. …”

Section: Introductionmentioning

confidence: 99%

Treatment of a Benign Prostatic Hyperplasia by Nd:YAG Laser – Own Experience

Pypno¹,

Husiatyński²

2000

European Urology

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“…It was concluded that besides the prostate geometry and the blood perfusion, the power density at the urethral wall should be taken into account in the dosimetry for an effective BPH treatment. Shanberg et al [11] presented a study determining the depth of penetration of the laser in the human prostate at varying dosimetry. Using the Prolase II laser fiber, their data indicated that for this type of fiber there appeared to be an optimal power setting and pulse duration for the greatest depth of penetration.…”

Section: Discussionmentioning

confidence: 99%

Durability of laser fibers

et al. 1995

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In 90 patients treated with laser prostatectomy using the Urolase (n = 50) or Ultraline (n = 40) laser fiber, the fiber-tip durability was investigated. In general the Urolase fiber tips were less damaged than the Ultraline fiber tips. At visual inspection, 62% of the Urolase fiber tips were graded as minimally damaged in comparison with 28% of the Ultraline group. The Urolase fiber tips are more susceptible than the Ultraline fiber tips to damage caused by tissue contact, whereas the latter seem more fragile. Transmission measurements were performed in a laboratory setting to estimate the loss of energy output at the fiber tip due to damage. These measurements showed a major loss in almost all fibers. None of the Ultraline fibers had less than 10% transmission loss, and 18% of the Urolaser fibers had a transmission value of more than 90%. Finally, there seemed to be a poor correlation between the visual aspects of the fibers used and the changes in transmission.

show abstract

Depth of penetration of the neodymium:yttrium-aluminum-garnet laser in the human prostate at various dosimetry

Cited by 32 publications

References 5 publications

MRI-Correlated Morphological Changes after Nd:YAG Laser Treatment of the Human Prostate with the SideFocus® Fiber

MRI-Correlated Morphological Changes after Nd:YAG Laser Treatment of the Human Prostate with the SideFocus® Fiber

Treatment of a Benign Prostatic Hyperplasia by Nd:YAG Laser – Own Experience

Durability of laser fibers

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Depth of penetration of the neodymium:yttrium-aluminum-garnet laser in the human prostate at various dosimetry

Cited by 32 publications

References 5 publications

MRI-Correlated Morphological Changes after Nd:YAG Laser Treatment of the Human Prostate with the SideFocus® Fiber

MRI-Correlated Morphological Changes after Nd:YAG Laser Treatment of the Human Prostate with the SideFocus® Fiber

Treatment of a Benign Prostatic Hyperplasia by Nd:YAG Laser &ndash; Own Experience

Durability of laser fibers

Contact Info

Product

Resources

About

Treatment of a Benign Prostatic Hyperplasia by Nd:YAG Laser – Own Experience