... Descriptors : *ABLATION, *RESOLUTION, *MAGNETIC RESONANCE ... TEMPERATURE, MEDICINE, RADIOFREQUENCY, NEEDLES, PHASED ...

... Accession Number : ADA102234. Title : Laser Ablation and Resonance Ionization Spectroscopy (LARIS) for Trace Analysis of Solids. ...

... SOLUTION ASSISTED LASER ABLATION SYNTHESIS OF ... Page 3. Solution assisted laser ablation synthesis of discrete aluminum nanoparticles ...

We have investigated the precision of strontium isotope analysis by Laser Ablation-assisted Resonance Ionization Mass Spectrometry(LA-RIMS). We have confirmed that the mass discrimination effect on the {sup 87}Sr/{sup 86}Sr measurement was reduced by the internal correction method. For the present system, the precision of the isotope ratio of {sup ...

We have investigated the precision of strontium isotope analysis by Laser Ablation-assisted Resonance Ionization Mass Spectrometry(LA-RIMS). We have confirmed that the mass discrimination effect on the 87Sr/86Sr measurement was reduced by the internal correction method. For the present system, the precision of the isotope ratio of 87Sr/86Sr has been ...

This thesis discusses the following on resonant holographic measurements of laser ablation plume expansion: Introduction to laser ablation; applications of laser ablation; The study of plume expansion; holographic interferometry; resonant holographic inte...

Stable isotope analysis using Laser Ablation Assisted Resonant Ionization Mass Spectrometry (LA-RIMS) is discussed. For the case of the 87Sr/86Sr isotope ratio measurements with a single color two-photon excitation scheme, the mass discrimination effects, which occur in LA-RIMS, are analyzed and a precision of 0.6% was extracted. For ...

Atrial fibrillation, a cardiac arrhythmia characterized by unsynchronized electrical activity in the atrial chambers of the heart, is a rapidly growing problem in modern societies. One treatment, referred to as catheter ablation, targets specific parts of the left atrium for radio frequency ablation using an intracardiac catheter. Magnetic ...

... Descriptors : *ABLATION, *MAGNETIC RESONANCE IMAGING, *PROSTATE ... MEDICINE, PATIENTS, RADIOFREQUENCY, PHASED ARRAYS ...

Jan 22, 2011 ... Title: A combined laser-ablation resonance ionization mass spectrometer for planetary surface geochronology. Authors: Cardell, G. Taylor, M. ...

A new analytical technique has been developed for the detection of trace sodium impurity in single crystal silicon using laser ablation and resonance ionization spectroscopy. Sodium is detected in the ablated vapor by using two tunable laser probes to ind...

Magnetic Resonance imaging guided Focus Ultrasound Surgery (MRgFUS) is a highly precise method to ablate tissue non-invasively. To date, there is only one commercial MRgFUS system available and only a few are in a prototype stage. The objective of this ongoing project is to establish an MRgFUS therapy unit as add-on for a commercially available robotic ...

Breast imaging plays a significant role in treatment. Ultrasonography to drain fluid collections, vacuum-assisted biopsy to excise papillomas and fibroadenomas, and stereotactic excisional biopsy are a few examples of interventional procedures performed by radiologists in patients with breast disease. Moreover, there is a growing interest in the minimally invasive treatment of ...

... nm have been prepared by laser ablation of a metallic aluminum target submerged in dry tetrahydrofuran in the presence of 0.001 M oleic acid as ...

Ultrasmall nanopores in silver thin films with a diameter of about 2 nm have been fabricated using femtosecond laser ablation in liquid. Ultrafast laser pulse ablation generates highly nonequilibrium excitated states, from which silver thin films emerge and progressively grow with the assistance of capping agent molecules. During this ...

Laser desorption mass spectrometry is a useful method for interrogating materials and events at or near surfaces. Laser desorption/ablation combined with Resonance Ionization Mass Spectrometry (RIMS) provides a powerful tool to obtain information on chemi...

Progress in the development of an instrument for direct geochronologic measurements on rocks in situ

Controlled interaction of high-power pulsed electromagnetic radiation with plasma-exposed solid surfaces is a major challenge in applications spanning from electron beam accelerators in microwave electronics to pulsed laser ablation-assisted synthesis of nanomaterials. It is shown that the efficiency of such interaction can be potentially improved via an additional channel of ...

This thesis discusses the following on resonant holographic measurements of laser ablation plume expansion: Introduction to laser ablation; applications of laser ablation; The study of plume expansion; holographic interferometry; resonant holographic interferometry; accounting for finite laser ...

The deposition techniques for polymer thin films in organic light emitting diodes are limited to wet methods since molecular pyrolysis prevents the use of dry vacuum thermal evaporation methods. Wet methods have critical limitations such as poor thickness control, drying patterns and re-dissolution of previous layers. In this work, a novel approach, Matrix-Assisted ...

The purpose of this study was to investigate the effect of liquid thickness on laser ablation efficiency. Both Q-switched Nd:YAG (yttrium aluminum garnet) and free-running Er:YAG lasers were used to ablate polymethyl-methacrylate samples in the presence of a water layer. The thickness of the liquid layer varied from 500 {mu}m to 3 mm. ...

The purpose of this study was to investigate the effect of liquid thickness on laser ablation efficiency. Both Q-switched Nd:YAG (yttrium aluminum garnet) and free-running Er:YAG lasers were used to ablate polymethyl-methacrylate samples in the presence of a water layer. The thickness of the liquid layer varied from 500 ?m to 3 mm. ...

We report on aspects of resonant laser ablation (RLA) behavior for a number of sample types: metals, alloys, thin films, zeolites and soil. The versatility of RLA is demonstrated, with results on a variety of samples and in several mass spectrometers. In addition, the application to depth profiling of thin films is described; absolute removal rates and ...

RESONANCE LASER ABLATION WITH AN OPTICAL PARAMETRIC OSCILLATOR LASER AND DETECTION BY A MICROWAVE, University of Connecticut, 55 North Eagleville Road, Storrs, CT, 06269- 3060, U.S.A. Abstract: Laser ablation of solid samples was used for the determination of trace metals by use of either a pulsed excimer laser (20

The enhancement of ion signals by the resonant laser ablation (RLA) process was investigated by using a 2-color RLA mass spectrometry for samples containing Pb and Ni. Two laser beams, a second harmonic of Nd:YAG laser (532 nm) and a UV beam of frequency tunable dye laser, were used for either simultaneous ablation by directing both ...

Image-guided thermal ablation of bone tumors is gaining acceptance in the oncology community. Computed tomography-guided radiofrequency ablation and cryoablation are widely available and are used in clinical practice. However, a potentially devastating complication of these techniques is thermal injury to the spinal cord and nerve roots in patients with ...

Resonant Laser Ablation (RLA), which combines Laser Ablation (LA) and Resonance Ionization Spectroscopy (RIS) simultaneously with a single laser, can be used as a simple analytical technique of trace elements with high sensitivity and elemental (isotopic) selectivity for solid samples. However, the elemental ...

Laser ablation of bulk high-temperature superconductor (HTS) material provides a useful means of producing high-quality HTS thin films. Mass spectrometric probes of the ablation plume provide a microscopic understanding of the ablation event and plume development as well as providing a process monitor for the thin-film production. ...

Laser ablation of bulk High Temperature Superconductor (HTS) material promises to provide a useful means of producing high quality HTS thin films. Mass spectrometric probes of the ablation plume provide a microscopic understanding of the ablation event and plume development as well as providing a process monitor for the thin film ...

Pulsed laser ablation of mold compounds for IC packaging in air and with steam assistance is investigated. It is applied to decap IC packages and expose computer CPU dies for the device failure analyses. Compared with chemical decapping, the laser ablation has advantages of being fast speed, non- contact and dry processing. Laser ...

Carious dentine and enamel from extracted human teeth were ablated using a semiconductor diode laser in conjunction with an applied dye, indocyanine green. This technique offers selective ablation with minimal risk of thermal damage to surrounding dental tissues because uptake of the dye and its irradiation by the laser together control the ...

Ever since the first report of laser action, it has been recognized that laser ablation (evaporation/volatilization) may provide a useful sampling mechanism for chemical analysis. In particular, laser ablation is rapidly gaining popularity as a method of sample introduction for mass spectrometry. Since its original description, numerous research papers and ...

Spectroscopic and analytical properties of a trace analytical method using multi-step resonance ionization at high laser intensities (>kW/cm2) have been investigated with gadolinium as a test element. Strongly saturated transitions are observed, which have been used for a temperature determination of the atoms in the laser ablated plume. Regimes of ...

The unified web presence for the NASA Astrobiology Program which includes the NASA Astrobiology Institute (NAI), Astrobiology Science and Technology for ...

Jul 1, 1992... ALUMINUM OXIDES; BARIUM OXIDES; COPPER OXIDES; LASER ABLATION; MAGNETRON SPUTTERING; MIXED OXIDES; Q FACTORS; RESONANT FREQUENCIES; ...

Theory and results are presented for RIMS diagnostics of a variety of laser-materials interactions. 5 refs. 3 figs.

In this study, we investigated the role of water spray. To ablate human enamel tissue, a long-pulsed Er,Cr:YSGG laser was used at various radiant exposures. During dental ablation, distilled water was sprayed to the sample surface. Desiccated samples were also tested with direct irradiation for comparison. In order to identify dominant ...

Resonant laser ablation (RLA), which combines laser ablation (vaporization) and resonance ionization spectroscopy simultaneously with a single laser, can be used as a simple analytic technique of trace elements with high sensitivity and elemental (isotopic) selectivity for solid samples. To predict typical RLA ...

This study investigates the potential of using gold nanoshells to mediate a thermally induced modulation of tumor vasculature in experimental prostate tumors. We demonstrate that after passive extravasation and retention of the circulating nanoshells from the tumor vasculature into the tumor interstitium, the enhanced nanoshells absorption of near-infrared irradiation over normal vasculature, can ...

Interventional techniques using ultrasound guidance, such as Radio Frequency Ablation (RFA) of liver lesions, are the domain of the radiologist. However, real time ultrasound imaging as performed by the sonographer, is critical in monitoring the successful insertion and placement of the RFA needle. RFA is used to create a localised and controlled application of heat in order ...

The study of metals in biological systems is an emerging scientific field, receiving great attention as a new frontier, because it brings together researchers from many areas, including biology, chemistry, geology, medicine, physics and pharmacy. New possibilities in terms of strategies and instrumentation (microwave-assisted extraction, laser ablation ...

The module has three sections: 1) Introduction, 2) Series resonance, and 3) Parallel resonance. After an introduction to resonance the module presents series and parallel resonance in electric circuits made of resistors, capacitors, inductors, and active elements. The subject is discussed in terms of elements' ...

Laser ablation of polymers has become an established technique in the electronic industry and the large number of studies published annually indicates that this is still an attractive area of research. Several new approaches with new techniques and materials have given new insights in the ablation process. One of these approaches is the development of ...

... Title : Photon-Assisted Resonant ... STRUCTURES, SUPERLATTICES, TRANSPORT, OPTICAL ... ALUMINUM ALLOYS, PHOTONS, OPTICAL ...

... Title : Photon-Assisted Resonant Tunneling Through a GaAs/AlGaAs ... engineering techniques to tailor the perpendicular transport characteristics ...

We developed a method for compound host film synthesis and in situ doping based on plasma assisted pulsed laser deposition by coablation of two targets with two pulsed laser beams. The feasibility of this method was demonstrated by the preparation of Er-doped GaN films. In the reactive nitrogen environment and with the assistance of nitrogen plasma ...

Slow pathway (SP) ablation is an acceptable, standard method for atrioventricular nodal re-entrant tachycardia (AVNRT) ablation. The exact role of SP in the human heart and the possible negative implications of SP ablation are unknown. The current case report describes an unusual, brief, functional heart block, following radiofrequency ...

...884.6200 Assisted reproduction laser system. (a) Identification . The assisted reproduction laser system is a device that images, targets, and controls the power and pulse duration of a laser beam used to ablate a small...

OBJECTIVES: To assess the ablative effectiveness, the oncological and cosmetic efficacy of image-guided percutaneous cryoablation in the treatment of single breast nodules with subclinical dimensions after identification with ultrasonography (US), mammography, magnetic resonance (MRI) and characterization by vacuum assisted biopsy. ...

Time resolved shadowgraph images were recorded of shockwaves and particle ejection from silicon during laser ablation. Particle ejection and expansion were correlated to an internal shockwave resonating between the shockwave front and the target surface. The number of particles ablated increased with laser energy and was related to the ...

Here we describe a Resonance Ionization Mass Spectroscopy system which includes a Nd:YAG laser microprobe, multiphoton resonance ionization, a time-of-flight mass spectrometer, and a novel data acquisition system. With this system we have measured the rel...

The objective of this study was to understand the dominant mechanism(s) for dental enamel ablation with the application of water spray. A free-running Er,Cr:YSGG (yttrium, scandium, gallium, garnet) laser was used to ablate human enamel tissue at various radiant exposures. During dental ablation, distilled water was sprayed on the ...

The objective of this study was to understand the dominant mechanism(s) for dental enamel ablation with the application of water spray. A free-running Er,Cr:YSGG (yttrium, scandium, gallium, garnet) laser was used to ablate human enamel tissue at various radiant exposures. During dental ablation, distilled water was sprayed on the ...

We describe experiments on resonant infrared laser ablation of poly(ethylene glycol) (PEG) at two different resonant excitation wavelengths and for different molecular weights of PEG. The two resonant wavelengths correspond to different stretching vibrations of the polymer and have absorption coefficients that ...

We describe experiments on resonant infrared laser ablation of poly(ethylene glycol) (PEG) at two different resonant excitation wavelengths and for different molecular weights of PEG. The two resonant wavelengths correspond to different stretching vibrations of the polymer and have absorption coefficients that ...

technologies for: minimally invasive surgeries, energy-based interventions such as RF ablation, robotically assisted surgical systems, integration of imaging and interventional...

... We have grown " thin films by laser ablation of powdered PIN compressed into a pellet. ... pellet, but for some later runs the substrate was placed ...

In this manuscript we review briefly the history of Resonant Laser Ablation (RLA), and discuss some current ideas regarding sample preparation, laser parameters, and mechanisms. We also discuss current applications including spectral analysis of trace components, depth profiling of thin films and multilayer structures, and the use of RLA with the Ion Trap ...

Using reactive pulsed laser deposition assisted by electron cyclotron resonance (ECR) plasma, we have synthesized GaN thin films from a polycrystalline GaAs target at low temperatures. This was achieved by ablating the GaAs target in the reactive environment of a nitrogen plasma generated from ECR microwave discharge in pure nitrogen ...

PA1-06 Surface Plasmon Resonance Assisted Optical Imaging By: Cheng Ka Fai, Eddie (04116510) Lee-06 Surface Plasmon Resonance-assisted Optical Imaging Preparation DeviceLEDLaserBackgroundIntroduction #12;Objective Final Year Project 2007 PA1-06 Surface Plasmon Resonance-assisted Optical Imaging To develop

For selected indications laser ablation and cutting of biological tissues is clinical practice. Preferentially lasers with emission wavelengths in the far UV and the mid IR are used, for which tissue absorption is very high. Morphologically the ablation sites look surprisingly similar for the two wavelength ranges, despite of the very different prim y ...

We have developed an extreme sensitive trace element detection technique that has been labeled Laser ablation atomic fluorescence (LAAF) spectroscopy, and applied to a nanometer-scale solid surface analysis. The absolute weight of the detection limit of 870 ag (10-18g) and high depth resolution of 3.6 nm had been demonstrated in trace sodium detection of ...

Nanoparticle-assisted photo-thermal (NAPT) ablation has become a new and attractive modality for the treatment of cancerous tumors. This therapy exploits the passive accumulation of intravenously delivered optically resonant metal nanoparticles into tumors, however, the circulating bioavailability of these particles is often unknown. ...

The novel hybrid technique, Ablation Plasma Ion Implantation (APII), has been characterized and optimized for ion implantation and/or thin film deposition. In APII, a solid target is ablated by a laser; the resulting plasma plume is the source of ions, which are accelerated to high energy by a negative bias voltage imposed on the substrate. The ions are ...

The Radio Frequency Ablation Segmentation Tool (RFAST) is a software application developed using NIH's Medical Image Processing Analysis and Visualization (MIPAV) API for the specific purpose of assisting physicians in the planning of radio frequency ablation (RFA) procedures. The RFAST application sequentially leads the physician ...

The purpose of this study was to investigate the effect of liquid environments upon laser bone ablation. A long-pulsed Er,Cr:YSGG laser was employed to ablate bovine bone tibia at various radiant exposures under dry, wet (using water or perfluorocarbon) and spray environmental conditions. Energy loss by the application of liquid during laser irradiation ...

The purpose of this study was to investigate the effect of liquid environments upon laser bone ablation. A long-pulsed Er,Cr:YSGG laser was employed to ablate bovine bone tibia at various radiant exposures under dry, wet (using water or perfluorocarbon) and spray environmental conditions. Energy loss by the application of liquid during laser irradiation ...

We present a method towards optimization of multiple ablation probe placement to provide efficient coverage of a tumor for thermal therapy while respecting clinical needs such as limiting the sites of probe insertions at the pleura/liver surface, choosing secure probe trajectories and locations, avoiding ablation of critical structures, reducing ...

The influence of pulsed laser ablation of an aluminum target on the nitrogen plasma produced by electron cyclotron resonance (ECR) microwave discharge has been studied by optical emission spectroscopy (OES) with time and space resolution. The continuous wave (CW) feature of the optical emissions from the ECR nitrogen plasma turns to vary with time and ...

The detection of radio-frequency ablation lesions has been shown to be feasible using delayed enhancement magnetic resonance imaging (MRI). However, it is the determination of the lesion patterns that is of import for correlation with clinical outcome and location of gaps. Visualisation of ablation patterns on two-dimensional (2D) MR ...

The use of focused energy delivery in robotic assisted surgery for atrial fibrillation requires accurate prescription of ablation paths. In this paper, an original framework based on fusing human and machine vision for providing gaze-contigent control in robotic assisted surgery is provided. With the proposed method, binocular eye ...

Femtosecond lasers have proved to be effective tools for micromachining silicon carbide material. In the drilling process, however, when the debris around the hole was not removed efficiently, the depth of hole would not increase further. In this paper, alcohol-assisted photoetching of 6H silicon carbide was investigated using a femtosecond laser. Machining in the presence of ...

Method for measuring lead concentrations in blood. The present invention includes the use of resonant laser ablation to analyze .ltoreq.1 .mu.L (or equivalent mass) samples of blood for lead content. A typical finger prick, for example, yields about 10 .mu.L. Solid samples may also readily be analyzed by resonant laser ...

A charge-exchange cell based on pulsed-laser ablation has been developed and applied to collinear resonance ionization spectroscopy. A fast lithium ion beam has been neutralized in the charge-exchange cell and resonance ionization spectra of the 2s2S1/2- 2p2P01/2.3/2 transitions of lithium have been successfully observed. The ...

Radiofrequency ablation is one of the alternatives in the management of liver tumors, especially in patients who are not candidates for surgery. The aim of this article is to review applicability of radiofrequency ablation achieving complete tumor destruction, utility of imaging techniques for patients' follow-up, indications for local ...

Thermal ablation is an established treatment for tumor. The merging of newly developed imaging techniques has allowed precise targeting and real-time thermal mapping. This article provides an overview of the image-guided thermal ablation techniques in the treatment of uterine fibroids. Background on uterine fibroids, including epidemiology, histology, ...

Computed tomography is the standard imaging modality to minimize the extent of surgical or ablative treatment in osteoid osteomas. In the last 15 years, since a description of thermal ablation of osteoid osteomas was first published, this technique has become a treatment of choice for this tumor. We report the case of a 20-year-old man with an osteoid ...

BACKGROUND: Cutting bony tissue using short-pulsed laser ablation enables contact-free processing in arbitrary shapes and with considerably smaller incision widths compared with mechanical tools. This precise method necessitates assistance by robotic surgery. METHODS: Using a prototype system for robot assisted laser bone ...

Improvements to the Aerotherm Charring Material Thermal Response and Ablation Program (CMA) code have been made to resolve deficiencies that were identified during the Galileo spacecraft reentry/ablation studies for a Venus-Earth-Earth-Gravity-Assist (VEEGA) trajectory. They include several new algorithms to merge the Hunter carbon ...

Irradiation effects at low and high laser fluence on 2,5-dihydroxybenzoic acid large crystals were investigated. Contrary to what was observed for matrices as cinnamic acid derivatives, no chemical degradation of matrix is evidenced and continuous ablation as well as ion production resulted of extended irradiation in all the fluence range corresponding to classical ...

Laser ablation of (GeTe)(85)Sn(15) thin films as a function of atmospheric exposure was monitored in real time by transient reflectivity. The observed optical changes were correlated with microstructural analysis. Among the key findings were that the presence of water in the atmosphere during laser irradiation of a thin-film structure reduced the incident laser power required ...

The in vitro bone- and cartilage-ablation characteristics of the solid-state erbium:yttrium aluminum garnet laser were compared to those of the carbon dioxide laser. Ablations of fresh, frozen cadaver septal cartilage and maxillary sinus bone were performed using total energies between 1 and 6 J. Specimens were studied using hematoxylin and eosin stain and ...

Radiofrequecy ablation is the most widely used local ablative therapy for both primary and metastatic liver tumours. However, it has limited application in the treatment of large tumours (tumours >3cm) and multicentric tumours. In recent years, many strategies have been developed to extend the application of radiofrequency ablation ...

... by a Microwave Radiation Assisted Procedure CC ... 11 - Study of a microwave ferrite resonator antenna ... IET Microwaves, Antennas & Propagation, 3(8 ...

Microstrip ring resonators operating at 35 GHz were fabricated from laser ablated YBCO films deposited on lanthanum aluminate substrates. They were measured over a range of temperatures and their performances compared to identical resonators made of evaporated gold. Below 60 Kelvin the superconducting strip performed better than the ...

Microstrip ring resonators operating at 35 GHz were fabricated from laser ablated YBCO thin films deposited on lanthanum aluminate substrates. They were measured over a range of temperatures and their performance compared to identical resonators made of evaporated gold. Below 60 Kelvin the superconducting strip performed better than ...

We describe experiments on both resonant and non-resonant infrared pulsed laser of polystyrene across time scales varying from microseconds to picoseconds for the purpose of determining the ways in which the rate of energy deposition changes the response of both the ablated material and the residual substrate. RIR-PLD has been shown to ...

Percutaneous CT- and ultrasound-guided radiofrequency ablation of renal cell carcinoma (RCC) has been shown to have very promising medium-term results. We present a unique case of recurrent RCC after partial nephrectomy in a patient with a single kidney and impaired renal function. This tumor could not be visualized either with CT or with ultrasound. A combination of magnetic ...

Percutaneous CT- and ultrasound-guided radiofrequency ablation of renal cell carcinoma (RCC) has been shown to have very promising medium-term results. We present a unique case of recurrent RCC after partial nephrectomy in a patient with a single kidney and impaired renal function. This tumor could not be visualized either with CT or with ultrasound. A combination of magnetic ...

-253, 1988. [3] I. A. Chang and U. D. Nguyen, "Thermal modeling of lesion growth with radiofrequency ablation-weighted MRI sequences were suggested and tested for the monitoring of hyperthermia and thermal ablations of abdomino-pelvic T 1-weighted real-time thermal mapping of laser ablation," Journal of Magnetic ...

Mechanical and thermodynamic responses of biomaterials after impulsive heat deposition through vibrational excitations (IHDVE) are investigated and discussed. Specifically, we demonstrate highly efficient ablation of healthy tooth enamel using 55 ps infrared laser pulses tuned to the vibrational transition of interstitial water and hydroxyapatite around 2.95 microm. The peak ...

The Holmium:YAG laser was used to assist in 36 rhinologic procedures including surgery for chronic sinus disease, chronic dacryocystitis, recurrent choanal stenosis, and a sphenoid sinus mucocele. There were no laser related complications. The laser permitted controlled ablation of bone and soft tissue in all cases with satisfactory results. The Ho:YAG ...

BACKGROUND AND PURPOSE: Our aim was to investigate whether magnetic resonance imaging (MRI) with ferucarbotran administered prior to radiofrequency ablation could accurately assess ablative margin when compared with enhanced computed tomography (CT) with iodized oil marking. MATERIALS AND METHODS: We enrolled 27 patients with 32 ...

Laser ablation and resonance ionization have been used to monitor superconductive film preparation. From the desorption spectra, trapped O{sub 2} in high-{Tc} superconductors was found to play an important role in superconductivity.

We are developing a laser ablation (LA) resonance ionization (RI) mass spectrometer (MS) under PIDDP to make in-situ measurements of rock age and geochemistry on bodies with rocky surfaces.