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Wahabi JM, Abdul Aziz QA, Ng KH, Rahmat K, Ung NM, Mahdiraji GA, Ding Wong JH. Feasibility of determining mammography dose using LuSy dosimeter. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sosu E, Boadu M, Mensah S. Determination of dose delivery accuracy and image quality in full - Field digital mammography. JOURNAL OF RADIATION RESEARCH AND APPLIED SCIENCES 2019. [DOI: 10.1016/j.jrras.2018.02.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E.K. Sosu
- Medical Radiation Physics Centre, Radiological and Medical Science Research Institute, GAEC, P.O. Box LG 80, Legon, Accra, Ghana
- Medical Physics Department, School of Nuclear and Applied Science, University of Ghana, Atomic Campus, P.O. Box AE 1, Accra, Ghana
- Physics Department, University of Cape Coast, Cape Coast, Ghana
| | - M. Boadu
- Medical Radiation Physics Centre, Radiological and Medical Science Research Institute, GAEC, P.O. Box LG 80, Legon, Accra, Ghana
- Medical Physics Department, School of Nuclear and Applied Science, University of Ghana, Atomic Campus, P.O. Box AE 1, Accra, Ghana
| | - S.Y. Mensah
- Physics Department, University of Cape Coast, Cape Coast, Ghana
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Fedon C, Caballo M, Longo R, Trianni A, Sechopoulos I. Internal breast dosimetry in mammography: Experimental methods and Monte Carlo validation with a monoenergetic x-ray beam. Med Phys 2018; 45:1724-1737. [DOI: 10.1002/mp.12792] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 12/05/2017] [Accepted: 01/19/2018] [Indexed: 11/12/2022] Open
Affiliation(s)
- Christian Fedon
- Department of Radiology and Nuclear Medicine; Radboud University Medical Center; PO Box 9101 6500 HB Nijmegen The Netherlands
- Istituto Nazionale di Fisica Nucleare (INFN); sezione di Trieste; 34127 Trieste Italy
| | - Marco Caballo
- Department of Radiology and Nuclear Medicine; Radboud University Medical Center; PO Box 9101 6500 HB Nijmegen The Netherlands
| | - Renata Longo
- Istituto Nazionale di Fisica Nucleare (INFN); sezione di Trieste; 34127 Trieste Italy
- Dipartimento di Fisica; Università degli Studi di Trieste; 34127 Trieste Italy
| | - Annalisa Trianni
- Medical Physics Department; Azienda Sanitaria Universitaria Integrata (ASUIUD) - Presidio Ospedaliero “S. Maria della Misericordia”; p.le S. Maria della Misericordia, 15 33100 Udine Italy
| | - Ioannis Sechopoulos
- Department of Radiology and Nuclear Medicine; Radboud University Medical Center; PO Box 9101 6500 HB Nijmegen The Netherlands
- Dutch Expert Center for Screening (LRCB); PO Box 6873 6503 GJ Nijmegen The Netherlands
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Abstract
The estimation of the mean glandular dose to the breast (MGD) for x-ray based imaging modalities forms an essential part of quality control and is needed for risk estimation and for system design and optimisation. This review considers the development of methods for estimating the MGD for mammography, digital breast tomosynthesis (DBT) and dedicated breast CT (DBCT). Almost all of the methodology used employs Monte Carlo calculated conversion factors to relate the measurable quantity, generally the incident air kerma, to the MGD. After a review of the size and composition of the female breast, the various mathematical models used are discussed, with particular emphasis on models for mammography. These range from simple geometrical shapes, to the more recent complex models based on patient DBCT examinations. The possibility of patient-specific dose estimates is considered as well as special diagnostic views and the effect of breast implants. Calculations using the complex models show that the MGD for mammography is overestimated by about 30% when the simple models are used. The design and uses of breast-simulating test phantoms for measuring incident air kerma are outlined and comparisons made between patient and phantom-based dose estimates. The most widely used national and international dosimetry protocols for mammography are based on different simple geometrical models of the breast, and harmonisation of these protocols using more complex breast models is desirable.
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Affiliation(s)
- David R Dance
- National Co-ordinating Centre for the Physics of Mammography (NCCPM), Royal Surrey County Hospital, Guildford GU2 7XX, United Kingdom and Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom
| | - Ioannis Sechopoulos
- Department of Radiology and Nuclear Medicine, Radboud University Medical Centre, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands and Dutch reference centre for screening (LRCB), PO Box 6873, 6503 GJ Nijmegen, The Netherlands
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Manninen AL, Kotiaho A, Nikkinen J, Nieminen MT. Validation of a MOSFET dosemeter system for determining the absorbed and effective radiation doses in diagnostic radiology. RADIATION PROTECTION DOSIMETRY 2015; 164:361-367. [PMID: 25213263 DOI: 10.1093/rpd/ncu283] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 08/13/2014] [Indexed: 06/03/2023]
Abstract
This study aimed to validate a MOSFET dosemeter system for determining absorbed and effective doses (EDs) in the dose and energy range used in diagnostic radiology. Energy dependence, dose linearity and repeatability of the dosemeter were examined. The absorbed doses (ADs) were compared at anterior-posterior projection and the EDs were determined at posterior-anterior, anterior-posterior and lateral projections of thoracic imaging using an anthropomorphic phantom. The radiation exposures were made using digital radiography systems. This study revealed that the MOSFET system with high sensitivity bias supply set-up is sufficiently accurate for AD and ED determination. The dosemeter is recommended to be calibrated for energies <60 and >80 kVp. The entrance skin dose level should be at least 5 mGy to minimise the deviation of the individual dosemeter dose. For ED determination, dosemeters should be implanted perpendicular to the surface of the phantom to prevent the angular dependence error.
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Affiliation(s)
- A-L Manninen
- Department of Diagnostic Radiology, Oulu University Hospital, PO Box 50, Oulu FI-90029, Finland Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - A Kotiaho
- Department of Diagnostic Radiology, Oulu University Hospital, PO Box 50, Oulu FI-90029, Finland Department of Physical Sciences, Biophysics, University of Oulu, PO Box 3000, Oulu FI-90014, Finland Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
| | - J Nikkinen
- Department of Diagnostic Radiology, Oulu University Hospital, PO Box 50, Oulu FI-90029, Finland Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland Department of Oncology and Radiotherapy, Oulu University Hospital, PO Box 22, Oulu FI-90029, Finland
| | - M T Nieminen
- Department of Diagnostic Radiology, Oulu University Hospital, PO Box 50, Oulu FI-90029, Finland Department of Radiology, University of Oulu, PO Box 5000, Oulu FI-90014, Finland Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
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Cavagnetto F, Taccini G, Rosasco R, Bampi R, Calabrese M, Tagliafico A. 'In vivo' average glandular dose evaluation: one-to-one comparison between digital breast tomosynthesis and full-field digital mammography. RADIATION PROTECTION DOSIMETRY 2013; 157:53-61. [PMID: 23734057 DOI: 10.1093/rpd/nct120] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We analysed 300 patients X rayed with digital breast tomosynthesis (DBT), full-field digital mammography (FFDM) and 'COMBO' (single view both in FFDM and DBT in a single breast compression)-Hologic Selenia Dimension-W/Rh-Ag-Al: three different anode-filter combinations-automatic exposure control modalities. Examination parameter data collection (EPDC) and 'in vivo' dosimetry using metal oxide semiconductor field effect transistor (MOSFET) were utilised to determine and compare entrance skin air kerma (ESAK) and average glandular dose (AGD) from a radioprotection viewpoint in the DBT and COMBO modalities. MOSFET has been tested to be introduced in clinical routine. EPDC of DBT underlines increase in ESAK and AGD compared with FFDM (p < 0.05). The mean percentage increase was 34 % (+17 %) in ESAK and 46 % (+16 %) in AGD. In the COMBO modality, the mean percentage increase in ESAK was 162 % (+41 %) and in AGD was 202 % (+61 %). Differences between MOSFET measurement and calculated values were <8 % for breasts thicker than 30 mm; otherwise, the errors are >15 %. DBT increases ESAK and AGD, due to the 3D acquisition modality. MOSFET may be considered in DBT as a routine check.
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Affiliation(s)
- Francesca Cavagnetto
- Department of Medical Physics and Radiology, S.C.Fisica Medica e Sanitaria, A.O.U. IRCCS San Martino-IST, Largo R Benzi 10, Genova 16132, Italy
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Bassinet C, Huet C, Baumann M, Etard C, Réhel JL, Boisserie G, Debroas J, Aubert B, Clairand I. Characterization of MOSFET detectors for in vivo dosimetry in interventional radiology and for dose reconstruction in case of overexposure. HEALTH PHYSICS 2013; 104:379-384. [PMID: 23439141 DOI: 10.1097/hp.0b013e31827e10f3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
As MOSFET (Metal Oxide Semiconductor Field Effect Transistor) detectors allow dose measurements in real time, the interest in these dosimeters is growing. The aim of this study was to investigate the dosimetric properties of commercially available TN-502RD-H MOSFET silicon detectors (Best Medical Canada, Ottawa, Canada) in order to use them for in vivo dosimetry in interventional radiology and for dose reconstruction in case of overexposure. Reproducibility of the measurements, dose rate dependence, and dose response of the MOSFET detectors have been studied with a Co source. Influence of the dose rate, frequency, and pulse duration on MOSFET responses has also been studied in pulsed x-ray fields. Finally, in order to validate the integrated dose given by MOSFET detectors, MOSFETs and TLDs (LiF:Mg,Cu,P) were fixed on an Alderson-Rando phantom in the conditions of an interventional neuroradiology procedure, and their responses have been compared. The results of this study show the suitability of MOSFET detectors for in vivo dosimetry in interventional radiology and for dose reconstruction in case of accident, provided a well-corrected energy dependence, a pulse duration equal to or higher than 10 ms, and an optimized contact between the detector and the skin of the patient are achieved.
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Affiliation(s)
- Céline Bassinet
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), BP17, 92262 Fontenay-aux-Roses cedex, France.
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Development of an Adjustable Model Breast for Mammographic Dosimetry Assessment in Taiwanese Women. AJR Am J Roentgenol 2011; 196:W476-81. [DOI: 10.2214/ajr.09.3700] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Huda W, Nickoloff EL, Boone JM. Overview of patient dosimetry in diagnostic radiology in the USA for the past 50 years. Med Phys 2009; 35:5713-28. [PMID: 19175129 DOI: 10.1118/1.3013604] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
This review covers the role of medical physics in addressing issues directly related to patient dosimetry in radiography, fluoroscopy, mammography, and CT. The sections on radiography and fluoroscopy radiation doses review the changes that have occurred during the last 50 to 60 years. A number of technological improvements have contributed to both a significant reduction in patient and staff radiation doses and improvements to the image quality during this period of time. There has been a transition from film-screen radiography with hand dip film processing to electronic digital imaging utilizing CR and DR. Similarly, fluoroscopy has progressed by directly viewing image intensifiers in darkened rooms to modern flat panel image receptor systems utilizing pulsed radiation, automated variable filtration, and digitally processed images. Mammography is one of the most highly optimized imaging procedures performed, because it is a repetitive screening procedure that results in annual radiation exposure. Mammography is also the only imaging procedure in the United States in which the radiation dose is regulated by the federal government. Consequently, many medical physicists have studied the dosimetry associated with screen-film and digital mammography. In this review, a brief history of mammography dose assessment by medical physicists is discussed. CT was introduced into clinical practice in the early 1970s, and has grown into one of the most important modalities available for diagnostic imaging. CT dose quantities and measurement techniques are described, and values of radiation dose for different types of scanner are presented. Organ and effective doses to adult patients are surveyed from the earliest single slice scanners, to the latest versions that include up to two x-ray tubes and can incorporate as many as 256 detector channels. An overview is provided of doses received by pediatric patients undergoing CT examinations, as well as methods, and results, of studies performed to assess the radiation absorbed by the conceptus of pregnant patients.
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Affiliation(s)
- Walter Huda
- Department of Radiology, Medical University of South Carolina, Charleston, South Carolina 29425-3230, USA.
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Benevides LA, Huston AL, Justus BL, Falkenstein P, Brateman LF, Hintenlang DE. Characterization of a fiber‐optic‐coupled radioluminescent detector for application in the mammography energy range. Med Phys 2007; 34:2220-7. [PMID: 17654923 DOI: 10.1118/1.2736788] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Fiber-optic-coupled radioluminescent (FOC) dosimeters are members of a new family of dosimeters that are finding increased clinical applications. This study provides the first characterization of a Cu doped quartz FOC dosimeter at diagnostic energies, specifically across the range of x-ray energies and intensities used in mammographies. We characterize the calibration factors, linearity, angular dependence, and reproducibility of the FOC dosimeters. The sensitive element of each dosimeter was coupled to a photon counting photomultiplier module via 1 m long optical fibers. A computer controlled interface permitted real-time monitoring of the dosimeter output and rapid data acquisition. The axial-angular responses for all dosimeter models show nearly uniform response without any marked decrease in sensitivity. However, the normal-to-axial angular response showed a marked decrease in sensitivity of about 0 degrees C and 180 degrees C. In most clinical applications, appropriate dosimeter positioning can minimize the contributions of the varying normal-to-axial response. The FOC dosimeters having the greatest sensitive length provided the greatest sensitivity, with greatest to lowest sensitivity observed for 4.0, 1.9, 1.6, and 1.1 mm length sensitive elements. The average sensitivity of the dosimeters varies linearly with sensitive volume (R2=95%) and as a function of tube potential and target/filter combinations, generally exhibiting an increased sensitivity for higher energies. The dosimeter sensitivity as a function of tube potential had an average increase of 4.72 +/- 2.04% for dosimeter models and three target-filter combinations tested (Mo/Mo, Mo/Rh, and Rh/Rh) over a range of 25-31 kVp. All dosimeter models exhibited a linear response (R2 > or = 0.997) to exposure for all target-filter combinations, tube potentials, and tube current-time product stations evaluated and demonstrated reproducibility within 2%. All of the dosimeters examined in this study provided a response adequate for the accurate measurement of doses in clinical mammography applications.
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Affiliation(s)
- Luis A Benevides
- Naval Dosimetry Center, 8901 Wisconsin Avenue, Bethesda, Maryland 20889, USA.
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Wang B, Xu XG, Kim CH. Monte Carlo study of MOSFET dosemeter characteristics: dose dependence on photon energy, direction and dosemeter composition. RADIATION PROTECTION DOSIMETRY 2005; 113:40-46. [PMID: 15728424 DOI: 10.1093/rpd/nch426] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
MOSFET dosemeters are emerging as a versatile tool in various medical physics and health physics dose measurements. It is an important but difficult task to understand their energy and directional dependences because of their unique features. This paper presents a study to characterise a MOSFET dosemeter using Monte Carlo simulation method. Monoenergetic photon beams ranging from 15 to 6 MeV were simulated to study the energy and angular dependences. The results were compared with published experimental data. The Monte Carlo model also provided insightful information on optimising the dosemeter design by examining how various regions of the dosemeter contributed to the dose. Detailed energy deposition processes were further analysed by tracking individual particles inside the dosemeter.
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Affiliation(s)
- Brian Wang
- Nuclear Engineering and Engineering Physics Program, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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Beddar AS, Salehpour M, Briere TM, Hamidian H, Gillin MT. Preliminary evaluation of implantable MOSFET radiation dosimeters. Phys Med Biol 2004; 50:141-9. [PMID: 15715428 DOI: 10.1088/0031-9155/50/1/011] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In this paper, we report on measurements performed on a new prototype implantable radiation detector that uses metal-oxide semiconductor field effect transistors (MOSFETs) designed for in vivo dosimetry. The dosimeters, which are encapsulated in hermetically sealed glass cylinders, are used in an unbiased mode during irradiation, unlike other MOSFET detectors previously used in radiotherapy applications. They are powered by radio frequency telemetry for dose measurements, obviating the need for a power supply within each capsule. We have studied the dosimetric characteristics of these MOSFET detectors in vitro under irradiation from a 60Co source. The detectors show a dose reproducibility generally within 5% or better, with the main sources of error being temperature fluctuations occurring between the pre- and post-irradiation measurements as well as detector orientation. A better temperature-controlled environment leads to a reproducibility within 2%. Our preliminary in vitro results show clearly that true non-invasive in vivo dosimetry measurements are feasible and can be performed remotely using telemetric technology.
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Affiliation(s)
- A S Beddar
- Division of Radiation Oncology, Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
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Benson C, Price RA, Silvie J, Jaksic A, Joyce MJ. Radiation-induced statistical uncertainty in the threshold voltage measurement of MOSFET dosimeters. Phys Med Biol 2004; 49:3145-59. [PMID: 15357188 DOI: 10.1088/0031-9155/49/14/009] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The results of a recent study on the limiting uncertainties in the measurement of photon radiation dose with MOSFET dosimeters are reported. The statistical uncertainty in dose measurement from a single device has been measured before and after irradiation. The resulting increase in 1/f noise with radiation dose has been investigated via various analytical models. The limit of uncertainty in the ubiquitous linear trend of threshold voltage with dose has been measured and compared to two nonlinear models. Inter-device uncertainty has been investigated in a group of 40 devices, and preliminary evidence for kurtosis and skewness in the distributions for devices without external bias has been observed.
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Affiliation(s)
- Chris Benson
- Engineering Department, Lancaster University, Bailrigg, Lancaster, Lancashire LA1 4YR, UK
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Wang B, Kim CH, Xua XG. Monte Carlo modeling of a High-Sensitivity MOSFET dosimeter for low- and medium-energy photon sources. Med Phys 2004; 31:1003-8. [PMID: 15191284 DOI: 10.1118/1.1688272] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Metal-oxide-semiconductor field effect transistor (MOSFET) dosimeters are increasingly utilized in radiation therapy and diagnostic radiology. While it is difficult to characterize the dosimeter responses for monoenergetic sources by experiments, this paper reports a detailed Monte Carlo simulation model of the High-Sensitivity MOSFET dosimeter using Monte Carlo N-Particle (MCNP) 4C. A dose estimator method was used to calculate the dose in the extremely thin sensitive volume. Efforts were made to validate the MCNP model using three experiments: (1) comparison of the simulated dose with the measurement of a Cs-137 source, (2) comparison of the simulated dose with analytical values, and (3) comparison of the simulated energy dependence with theoretical values. Our simulation results show that the MOSFET dosimeter has a maximum response at about 40 keV of photon energy. The energy dependence curve is also found to agree with the predicted value from theory within statistical uncertainties. The angular dependence study shows that the MOSFET dosimeter has a higher response (about 8%) when photons come from the epoxy side, compared with the kapton side for the Cs-137 source.
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Affiliation(s)
- Brian Wang
- Nuclear Engineering and Engineering Physics Program, NES Building, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
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