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Gold nanoparticles radiation

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https://www.readbyqxmd.com/read/28048930/su-f-t-54-determination-of-the-aapm-tg-43-brachytherapy-dosimetry-parameters-for-a-new-titanium-encapsulated-yb-169-source-by-monte-carlo-calculations
#1
F Reynoso, J Munro, S Cho
PURPOSE: To determine the AAPM TG-43 brachytherapy dosimetry parameters of a new titanium-encapsulated Yb-169 source designed to maximize the dose enhancement during gold nanoparticle-aided radiation therapy (GNRT). METHODS: An existing Monte Carlo (MC) model of the titanium-encapsulated Yb-169 source, which was described in the current investigators' published MC optimization study, was modified based on the source manufacturer's detailed specifications, resulting in an accurate model of the titanium-encapsulated Yb-169 source that was actually manufactured...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048528/we-h-206-01-photoacoustic-tomography-multiscale-imaging-from-organelles-to-patients-by-ultrasonically-beating-the-optical-diffusion-limit
#2
L Wang
: Lihong V. Wang: Photoacoustic tomography (PAT), combining non-ionizing optical and ultrasonic waves via the photoacoustic effect, provides in vivo multiscale functional, metabolic, and molecular imaging. Broad applications include imaging of the breast, brain, skin, esophagus, colon, vascular system, and lymphatic system in humans or animals. Light offers rich contrast but does not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution pure optical imaging (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048346/su-f-t-660-evaluating-the-benefit-of-using-dual-function-fiducial-markers-for-in-situ-delivery-of-radiosenistizing-gold-nanoparticles-during-image-guided-radiotherapy
#3
S AlMansour, J Chin, E Sajo, W Ngwa
PURPOSE: Dual-function fiducials loaded with radiosensitizers, like gold nanoparticles (GNP), offer an innovative approach for ensuring geometric accuracy during image-guided radiotherapy (IGRT) and significantly increasing therapeutic efficacy due to controlled in-situ release of the radiosensitizers. This study retrospectively investigates the dosimetric benefit of using up to two such dual-function fiducial markers instead of traditional single function fiducials during IGRT. METHODS: A computational code was developed to investigate the dosimetric benefit for 10 real patient tumor volumes of up to 6...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048216/su-f-j-220-micro-ct-based-quantification-of-mouse-brain-vasculature-the-effects-of-acquisition-technique-and-contrast-material
#4
C Tipton, M Lamba, Z Qi, K LaSance, C Tipton
PURPOSE: Cognitive impairment from radiation therapy to the brain may be linked to the loss of total blood volume in the brain. To account for brain injury, it is crucial to develop an understanding of blood volume loss as a result of radiation therapy. This study investigates µCT based quantification of mouse brain vasculature, focusing on the effect of acquisition technique and contrast material. METHODS: Four mice were scanned on a µCT scanner (Siemens Inveon)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047869/we-h-206-02-recent-advances-in-multi-modality-molecular-imaging-of-small-animals
#5
B Tsui
: Lihong V. Wang: Photoacoustic tomography (PAT), combining non-ionizing optical and ultrasonic waves via the photoacoustic effect, provides in vivo multiscale functional, metabolic, and molecular imaging. Broad applications include imaging of the breast, brain, skin, esophagus, colon, vascular system, and lymphatic system in humans or animals. Light offers rich contrast but does not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution pure optical imaging (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047205/we-h-206-03-promises-and-challenges-of-benchtop-x-ray-fluorescence-ct-xfct-for-quantitative-in-vivo-imaging
#6
S Cho
: Lihong V. Wang: Photoacoustic tomography (PAT), combining non-ionizing optical and ultrasonic waves via the photoacoustic effect, provides in vivo multiscale functional, metabolic, and molecular imaging. Broad applications include imaging of the breast, brain, skin, esophagus, colon, vascular system, and lymphatic system in humans or animals. Light offers rich contrast but does not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution pure optical imaging (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047161/tu-h-campus-tep3-01-gold-nanoparticle-enhanced-radiation-therapy-in-in-vitro-a549-lung-carcinoma-studies-in-both-traditional-monolayer-and-three-dimensional-cell-culture-models
#7
M Oumano, W Ngwa, J Celli, M Arnoldussen, J Hanlon, J Hempstead, L Petrovic
PURPOSE: To measure the increase in in vitro radiosensitivity for A549 lung carcinoma cells due to gold nanoparticle (GNP) radiation dose enhancement in both traditional monolayer and three dimensional (3D) cell culture models. METHODS: A γH2AX immunofluorescence assay is performed on monolayer A549 cell culture and quantitatively analyzed to measure the increase in double strand breaks (DSBs) resulting from GNP dose enhancement. A clonogenic survival assay (CSA) is then performed on monolayer A549 cell culture to assess true viability after treatment...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047003/su-g-tep3-04-evaluation-of-the-dose-enhancement-with-gold-nanoparticle-in-microdosimetry-level-using-the-geant4-dna-toolkit
#8
C He, J Chow
PURPOSE: This study investigated the dose enhancement effect of using gold nanoparticles (GNP) as radiation sensitizers radiated by different photon beam energies. Microdosimetry of photon-irradiated GNP was determined by the Geant4-DNA process in the DNA scale. METHODS: Monte Carlo simulation was conducted using the Geant4 toolkit (ver. 10.2). A GNP with different sizes (30, 50, and 100nm diameter sphere) and a DNA were placed in a water cube (1µm(3) ). The GNP was irradiated by photon beams with different energies (50, 100, and 150keV) and produced secondary electrons to increase the dose to the DNA...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046495/tu-h-campus-tep3-02-in-situ-dose-painting-using-gold-nanoparticles-released-from-cylindrically-shaped-fiducials-during-external-beam-radiation-therapy
#9
R Mueller, Y Hao, J Hesser, W Ngwa
PURPOSE: Recent studies have shown that the presence of Gold Nanoparticles (GNPs) in tumor tissue can lead to significant dose enhancement (DE) during External Beam Radiation Therapy (EBRT). In this in-silico study we investigate EBRT with in-situ dose painting using GNPs released from cylindrically shaped GNP-loaded fiducials. METHODS: Reported Biologically Target/Tumor Volumes (BTVs) for 12 prostate carcinoma patients were employed in this study. Distribution of the GNPs after burst release from the fiducial (1...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046461/we-h-206-00-advances-in-preclinical-imaging
#10
Patrick La Riviere
: Lihong V. Wang: Photoacoustic tomography (PAT), combining non-ionizing optical and ultrasonic waves via the photoacoustic effect, provides in vivo multiscale functional, metabolic, and molecular imaging. Broad applications include imaging of the breast, brain, skin, esophagus, colon, vascular system, and lymphatic system in humans or animals. Light offers rich contrast but does not penetrate biological tissue in straight paths as x-rays do. Consequently, high-resolution pure optical imaging (e...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046346/su-g-tep3-05-in-vitro-demonstration-of-endothelial-dose-enhancement-due-to-gold-nanoparticles-during-low-voltage-radiotherapy
#11
S Yasmin-Karim, M Moreau, R Kumar, G M Makrigiorgos, J Hanlon, M Arnoldussen, J Hempstead, J Celli, W Ngwa
PURPOSE: Oraya Therapy uses low-voltage, stereotactic, highly targeted X-rays for the treatment of wet age-related macular degeneration (AMD) - offering a new option for patients worldwide. Neovascular endothelial cells play a crucial role in the pathogenesis of this disease. This in-vitro study investigates the potential of gold nanoparticles (GNP) to enhance endothelial cell damage during low-voltage radiotherapy towards potential applications in the treatment of wet-AMD. METHODS: Primary human umbilical cord vein endothelium cells (HUVEC) were treated with 1...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28044470/gold-nanoparticles-as-dose-enhancement-agent-for-kilovoltage-x-ray-therapy-of-melanoma
#12
So-Ra Kim, Eun-Hee Kim
PURPOSE: Melanoma is mainly treated by surgery and rarely with radiation because of the high radio-resistance of this tumor. Nevertheless, radiotherapy is the preferred treatment modality for unresectable lesions and avoiding cosmetic disfigurement caused by surgical excision. This study investigated the therapeutic advantage of gold nanoparticles (AuNPs) for kilovoltage X-ray treatment of melanoma. MATERIALS AND METHODS: Commercial AuNPs were evaluated for cytotoxicity and cellular internalization...
January 3, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28001308/heterogeneous-multiscale-monte-carlo-simulations-for-gold-nanoparticle-radiosensitization
#13
Martin P Martinov, Rowan M Thomson
PURPOSE: To introduce the heterogeneous multiscale (HetMS) model for Monte Carlo simulations of gold nanoparticle dose-enhanced radiation therapy (GNPT), a model characterized by its varying levels of detail on different length scales within a single phantom; to apply the HetMS model in two different scenarios relevant for GNPT and to compare computed results with others published. METHODS: The HetMS model is implemented using an extended version of the EGSnrc user-code egs chamber; the extended code is tested and verified via comparisons with recently-published data from independent GNP simulations...
December 21, 2016: Medical Physics
https://www.readbyqxmd.com/read/27991768/surface-plasmon-coupled-fluorescence-enhancement-based-on-ordered-gold-nanorod-array-biochip-for-ultrasensitive-dna-analysis
#14
Zhong Mei, Liang Tang
An innovative gold nanorod (GNR) array biochip was developed to systematically investigate the localized surface plasmon resonance (LSPR)-coupled fluorescence enhancement for signal amplification in molecular beacon detection. An ordered GNR assembly in vertical standing array on a glass surface was fabricated as plasmonic substrates, resulting in dramatically intensified LSPR between adjacent nanoparticles as compared to that from an ensemble of random nanorods. We have shown that the plasmonic response of the nanoarray can be tuned by the proper choice of GNR size to overlap the fluorophore excitation and emission wavelengths greater than 600 nm...
December 19, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27987070/local-radiation-treatment-of-her2-positive-breast-cancer-using-trastuzumab-modified-gold-nanoparticles-labeled-with-177-lu
#15
Zhongli Cai, Simmyung Yook, Yijie Lu, Dane Bergstrom, Mitchell A Winnik, Jean-Philippe Pignol, Raymond M Reilly
PURPOSE: To compare the effectiveness of trastuzumab-modified gold nanoparticles (AuNP) labeled with (177)Lu (trastuzumab-AuNP-(177)Lu) targeted to HER2 with non-targeted AuNP-(177)Lu for killing HER2-overexpressing breast cancer (BC) cells in vitro and inhibiting tumor growth in vivo following intratumoral (i.t.) injection. METHODS: AuNP (30 nm) were modified with polyethylene glycol (PEG) polymers linked to trastuzumab or to 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) chelators to complex (177)Lu...
December 16, 2016: Pharmaceutical Research
https://www.readbyqxmd.com/read/27984858/gold-nanoparticles-increases-uv-and-thermal-stability-of-human-serum-albumin
#16
Robin Capomaccio, Inês Osório, Isaac Ojea-Jiménez, Giacomo Ceccone, Pascal Colpo, Douglas Gilliland, Rohanah Hussain, Giuliano Siligardi, Francois Rossi, Sylvie Ricard-Blum, Luigi Calzolai
Ultraviolet (UV) radiation, temperature, and time can degrade proteins. Here, the authors show that gold nanoparticles significantly protect human serum albumin from denaturation when exposed to "stressing" conditions such as UV irradiation and sustained exposure in suboptimal conditions. In particular, the authors show that gold nanoparticles significantly reduce the decrease in secondary structure induced by UV irradiation or extended exposure to ambient temperature.
December 16, 2016: Biointerphases
https://www.readbyqxmd.com/read/27942672/fret-enhancement-close-to-gold-nanoparticles-positioned-in-dna-origami-constructs
#17
Nesrine Aissaoui, Kasper Moth-Poulsen, Mikael Käll, Peter Johansson, L Marcus Wilhelmsson, Bo Albinsson
Here we investigate the energy transfer rates of a Förster resonance energy transfer (FRET) pair positioned in close proximity to a 5 nm gold nanoparticle (AuNP) on a DNA origami construct. We study the distance dependence of the FRET rate by varying the location of the donor molecule, D, relative to the AuNP while maintaining a fixed location of the acceptor molecule, A. The presence of the AuNP induces an alteration in the spontaneous emission of the donor (including radiative and non-radiative rates) which is strongly dependent on the distance between the donor and AuNP surface...
December 12, 2016: Nanoscale
https://www.readbyqxmd.com/read/27921518/increased-radio-toxicity-in-two-cancerous-cell-lines-irradiated-by-low-and-high-energy-photons-in-the-presence-of-thio-glucose-bound-gold-nanoparticles
#18
Shokouhozaman Soleymanifard, Atefeh Rostami, Seyed Amir Aledavood, Maryam Moghadam Matin, Ameneh Sazgarnia
PURPOSE: Gold nanoparticles modified by thio-glucose have been believed to increase the toxicity of radiotherapy in human malignant cells. We report the effect of thio-glucose-bound gold nanoparticles (Glu-G nanoparticles), 16 nm in size, on two human lung (QU-DB) and breast (MCF7) cancer cell lines combined with kilo and megavoltage X-rays. MATERIALS AND METHODS: The shape and surface characteristics, the size distribution and light absorption spectrum of the prepared nanoparticles were measured by transmission electron microscopy, dynamic light scattering, and Ultraviolet-Visible spectrophotometry, respectively...
December 6, 2016: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/27917407/microwave-heating-of-synthetic-skin-samples-for-potential-treatment-of-gout-using-the-metal-assisted-and-microwave-accelerated-decrystallization-technique
#19
Salih Toker, Zainab Boone-Kukoyi, Nishone Thompson, Hillary Ajifa, Travis Clement, Birol Ozturk, Kadir Aslan
Physical stability of synthetic skin samples during their exposure to microwave heating was investigated to demonstrate the use of the metal-assisted and microwave-accelerated decrystallization (MAMAD) technique for potential biomedical applications. In this regard, optical microscopy and temperature measurements were employed for the qualitative and quantitative assessment of damage to synthetic skin samples during 20 s intermittent microwave heating using a monomode microwave source (at 8 GHz, 2-20 W) up to 120 s...
November 30, 2016: ACS Omega
https://www.readbyqxmd.com/read/27916516/local-dose-enhancement-of-proton-therapy-by-ceramic-oxide-nanoparticles-investigated-with-geant4-simulations
#20
Sally McKinnon, Susanna Guatelli, Sebastien Incerti, Vladimir Ivanchenko, Konstantin Konstantinov, Stéphanie Corde, Michael Lerch, Moeava Tehei, Anatoly Rosenfeld
Nanoparticles (NPs) have been shown to enhance X-ray radiotherapy and proton therapy of cancer. The effectiveness of radiation damage is enhanced in the presence of high atomic number (high-Z) NPs due to increased production of low energy, higher linear energy transfer (LET) secondary electrons when NPs are selectively internalized by tumour cells. This work quantifies the local dose enhancement produced by the high-Z ceramic oxide NPs Ta2O5 and CeO2, in the target tumour, for the first time in proton therapy, by means of Geant4 simulations...
December 2016: Physica Medica: PM
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