Technical aspects of lasers in urology

Teichmann, Heinrich‐Otto; Herrmann, Thomas; Bach, Thorsten

doi:10.1007/s00345-007-0184-5

Cited by 131 publications

(66 citation statements)

References 14 publications

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“…6 One of the classifications of laser output in urology is continuous wave (CW); the output of the laser is continuously pumped and constantly emits light; whereas in pulsed wave (PW); it releases its energy in very short pulses which can have incredibly high peak powers, that is useful for stone fragmentation. 7 The pioneers of lasers in clinical urology were Parsons with a research in canine bladders in 1966, Staehler et al in bladder tumors in 1976 and Mulvany with experiments in calculi fragmentation in 1968. 5,8 For the last 2 decades, laser techniques have been widely used for management of pa tients with urolithiasis, bladder tumors, benign prostatic hyperplasia (BPH), urinary tract strictures or le sions of the external genitalia.…”

Section: Introductionmentioning

confidence: 99%

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Laser Application in Iran Urology: A Narrative Review

Razzaghi

Ghiasy

et al. 2017

J Lasers Med Sci

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The usage of laser in medicine is not recent, and its history in urology goes back to 40 years ago. For the last 2 decades, common uses of laser have been treatments of subjects with urolithiasis, bladder tumors, benign prostatic enlargement, le sions of the genitalia and urinary tract strictures. To evaluate laser application in urology in Iran, we reviewed all of the Iranian literature on the topic. This study was designed to retrieve all studies on laser application in urology in Iran, regardless of publication status or language, covering years 1990-2017. Twentysix articles were identified: 12 about urolithiasis, 8 about benign prostatic hyperplasia (BPH), 2 case reports, 1 paper about prostate cancer, 1 on female urethral stricture, 1 review and 1 basic sciences study. We conclude that the use of this technology has not yet found its position in Iran, especially in the field of urology. The main causes for it are the difficult accessibility and disturb of laser devices and its accessories, as well as the lack of adequate knowledge of the medical community about this modality.

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Section: Introductionmentioning

confidence: 99%

“…Due to frequent complications, the use of some types of lasers was stopped. 2,6,7 Here we review all of the Iranian publications about the application of laser in urology.…”

Section: Introductionmentioning

confidence: 99%

Laser Application in Iran Urology: A Narrative Review

Razzaghi

Ghiasy

et al. 2017

J Lasers Med Sci

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“…Once the pump was turned on, MRI acquisitions were started every 3 min until 30 min. In a second series of ex vivo experiments, a commercial semiconductor laser (RevoLix jr.30, LISA laser products OHG, Katlenburg-Lindau, Germany) with a wavelength of 2 μm was used to achieve focal heating (23,24). The laser was located outside the MRI scanner room and the thermal energy was transmitted by a thin and flexible laser fiber …”

Section: Ex Vivo Studiesmentioning

confidence: 99%

Towards MRI temperature mapping in real time—the proton resonance frequency method with undersampled radial MRI and nonlinear inverse reconstruction

Zhang

Michaelis

Frahm

2017

Quant. Imaging Med. Surg.

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IntroductionRecent developments in MRI provide a new method for real-time imaging (1) which offers so far unsurpassed diagnostic capabilities in a large variety of clinical fields. Respective applications range from cardiac MRI without ECG synchronization and during free breathing (2) to real-time studies of blood flow (3), swallowing (4), dysphagia (5), esophageal functions (6), dynamics of the temporomandibular joint (7), respiration-induced flow of the cerebrospinal fluid (8,9) as well as movements of the articulators during normal speech (10) or brass playing of patients with embouchure dystonia (11). In a technical sense, the method is based on highly undersampled radial gradient-echo sequences in combination with iterative image reconstruction by nonlinear inversion (NLINV) and temporal regularization (1). These new possibilities are expected to vastly broaden the range of clinical MRI and, in particular, to stimulate renewed interest in "interventional MRI", i.e., the use of real-time MRI for monitoring and guiding minimally invasive procedures.In this sense, true "real-time" MRI not only refers to high-speed data acquisitions, but includes (I) online Original ArticleTowards MRI temperature mapping in real time-the proton resonance frequency method with undersampled radial MRI and nonlinear inverse reconstruction

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“…24 Light interacts with tissue in four key ways: transmission, reflection, scattering, and absorption. 25 Reflection mainly depends on the optical properties of the tissue and the irritant surrounding it and reflection does not depend strongly on wavelength, so it could be neglected when evaluating a laser wavelength for a surgical application.…”

Section: Introductionmentioning

confidence: 99%

Auditory nerve impulses induced by 980 nm laser

et al. 2015

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Abstract. The discovery that a pulsed laser could trigger an auditory neural response inspired ongoing research on cochlear implants activated by optical stimulus rather than by electrical current. However, most studies to date have used visible light (532 nm) or long-wavelength near-infrared (>1840 nm) and involved making a hole in the cochlea. This paper investigates the effect of optical parameters on the optically evoked compound action potentials (oCAPs) from the guinea pig cochlea, using a pulsed semiconductor near-infrared laser (980 nm) without making a hole in the cochlea. Synchronous trigger laser pulses were used to stimulate the cochlea, before and after deafening, upon varying the pulse duration (30-1000 μs) and an amount of radiant energy (0-53.2 mJ∕cm 2 ). oCAPs were successfully recorded after deafening. The amplitude of the oCAPs increased as the infrared radiant energy was increased at a fixed 50 μs pulse duration, and decreased with a longer pulse duration at a fixed 37.1 mJ∕cm 2 radiant energy. The latency of the oCAPs shortened with increasing radiant energy at a fixed pulse duration. With a higher stimulation rate, the amplitude of the oCAPs' amplitude decreased.

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Technical aspects of lasers in urology

Cited by 131 publications

References 14 publications

Laser Application in Iran Urology: A Narrative Review

Laser Application in Iran Urology: A Narrative Review

Towards MRI temperature mapping in real time—the proton resonance frequency method with undersampled radial MRI and nonlinear inverse reconstruction

Auditory nerve impulses induced by 980 nm laser

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