Física: Envíos recientes

Mostrando ítems 21-40 de 114

    • Evaluación de la calidad de imagen del PET/CT Biograph Vision 450 al variar parámetros de reconstrucción 

      Montero Alpízar, Sebastián (2023)
      Los datos obtenidos por los sistemas PET/CT pasan por un algoritmo de reconstrucción antes de poder generar las imágenes. Estos algoritmos de reconstrucción permiten variar parámetros como el número de iteraciones y filtrado ...

    • Dose distribution for CBCT as an aid for radiation protection in dentistry 

      Campos Méndez, José Daniel; Arce Corrales, Luis; Barba Ramírez, Lucía; Noguera Vega, Gerardo; Mora Ramírez, Erick; Umaña Wong, Alejandra (2023)
      To characterize effective dose distributions in the craniofacial area for different acquisition parameters of dental cone beam CT, thermoluminescent dosimeters (TLD) were placed within an anthropomorphic phantom for ...

    • Dosimeter arrangement for effective dose and isodose curves desterminations into craniofacial cavity 

      Campos Méndez, José Daniel; Noguera Vega, Gerardo (2023)
      Tomographic dental imaging with cone beam computed tomography has developed so fast in Costa Rica, in the absence of investigations to determine the absorbed dose by the patients, we propose a TLD dosimeter array into RANDO ...

    • Evaluación de la Seguridad Radiológica del CICANUM: Laboratorio de Metrología de Radiaciones Ionizantes y Almacén de Residuos Radiactivos 

      Noguera Vega, Gerardo; Mora Rodríguez, Patricia (2018)
      El Centro de Investigación en Ciencias Atómicas, Nucleares y Moleculares (CICANUM) posee laboratorios que constituyen un riesgo radiológico latente, tales como, el Laboratorio de Metrología de Radiaciones Ionizantes (LMRI) ...

    • Validación de Calidades de Rayos X Diagnósticos en el Laboratorio de Metrología de Radiaciones Ionizantes 

      Mora Rodríguez, Patricia; Noguera Vega, Gerardo; Porras Chaverri, Mariela (2018)
      El objetivo del trabajo fue validar la calidad de radiación para energía de radiodiagnósticos del Laboratorio de Metrología de la Universidad de Costa Rica (UCR) como parte del proyecto técnico de cooperación COS9008 ...

    • Ozonesonde Quality Assurance: The JOSIE–SHADOZ (2017) Experience 

      Thompson, Anne M.; Smit, Herman G. J.; Witte, Jacquelyn C.; Stauffer, Ryan M.; Johnson, Bryan J.; Morris, Gary; von der Gathen, Peter; Van Malderen, Roeland; Davies, Jonathan; Piters, Ankie; Allaart, Marc; Posny, Françoise; Kivi, Rigel; Cullis, Patrick; Hoang Anh, Nguyen Thi; Corrales, Ernesto; Machinini, Tshidi; da Silva, Francisco R.; Paiman, George; Thiong’o, Kennedy; Zainal, Zamuna; Brothers, George B.; Wolff, Katherine R.; Nakano, Tatsumi; Stübi, Rene; Romanens, Gonzague; Coetzee, Gert J. R.; Díaz Díaz, Jorge Andrés; Mitro, Sukarni; Mohamad, Maznorizan; Ogino, Shin-Ya (2019)
      The ozonesonde is a small balloon-borne instrument that is attached to a standard radiosonde to measure profiles of ozone from the surface to 35 km with ∼100-m vertical resolution. Ozonesonde data constitute a mainstay of ...

    • Improvement of early detection of breast cancer through collaborative multi-country efforts: Medical physics component 

      Mora Rodríguez, Patricia; Faulkner, Keith; Mahmoud, Ahmed M.; Gershan, Vesna; Kausik, Aruna; Zdesar, Urban; Brandan, María Ester; Kurt, Serap; Davidović, Jasna; Salama, Dina H; Aribal, Erkin; Odio Salazar, Clara; Chaturvedi, Arvind K.; Sabih, Zahida; Vujnović, Saša; Paez, Diana; Delis, Harry (2018)
      Purpose: The International Atomic Energy Agency (IAEA) through a Coordinated Research Project on “Enhancing Capacity for Early Detection and Diagnosis of Breast Cancer through Imaging”, brought together a group of mammography ...

    • Energy exchange between atoms with a quartz crystal μ-balance 

      Guevara Bertsch, Milena; Chavarría Sibaja, Andrés; Godínez Sandí, Alejandro; Herrera Sancho, Óscar Andrey (2018)
      We propose an experimental method to fully characterize the energy exchange of particles during the physical vapor deposition (PVD) process of thin surface layers. Our approach is based on the careful observation of ...

    • Lamellar fluctuations melt ferroelectricity 

      Guzmán Verri, Gian Giacomo; Liang, Charles H.; Littlewood, Peter B. (2023)
      We consider a standard Ginzburg-Landau model of a ferroelectric whose electrical polarization is coupled to gradients of elastic strain [1–4]. At the harmonic level, such flexoelectric interaction is known to hybridize ...

    • Converging science and literature cultures: learning physics via The Little Prince novella 

      Godínez Sandí, Alejandro; Fallas Padilla, Diego Alonso; España Tapia, Sebastián; Zúñiga Villegas, Andrea; Castro Mora, Milena; Herrera Sancho, Óscar Andrey (2018)
      Primary level education follows a pedagogy model where literature and science have been historically separated. Natural children processes are disrupted, as learning based on play curiosity is completely transformed by a ...

    • Evaluación de la Dosis Efectiva por la Incorporación de Flúor 18 en el Personal Ocupacionalmente Expuesto del Laboratorio Ciclotrón-PET/CT 

      Bonilla Araya, Alexander Alberto (2023)
      La incorporación de radionúclidos es uno de los riesgos asociados a las prácticas de producción y manipulación de radiofármacos, por lo que, esta investigación tiene como objetivo general desarrollar una metodología para ...

    • Biological and dosimetric evaluation of [11C]S-adenosyl methionine as a potential agent for prostate cancer diagnosis 

      Zoppolo Lencina, Florencia; Mora Ramírez, Erick; Reyes Ábalos, Ana Laura; Vasilskis Castro, Elena Beatriz; Paolino Bordo, Andrea; Porcal Quinta, Williams Arturo; Oliver, Patricia; Savio Quevedo, Eduardo; Bardiès, Manuel; Engler, Henry (2018)
      Introduction: [11C]Choline ([11C]COL) has been widely used for prostate cancer diagnosis; however, this radiopharmaceutical is not recommended for patients with a low absolute PSA value (< 1 ng/mL) due to its limited ...

    • Determination of the dosimetric characteristics of a new polymer-encapsulated, elongated, 103Pd brachytherapy source using Monte Carlo calculations 

      Paxton, Adam B.; Porras Chaverri, Mariela; Davis, Stephen; DeWerd, Larry (2009)
      Purpose: To use Monte Carlo calculations to determine the dosimetric characteristics of CivaString, a new polymer-encapsulated, elongated, 103Pd brachytherapy source made by Civatech Oncology for prostate implants. This ...

    • QA Programme of the TLD laboratory of the University of Costa Rica: IEC 61066 testing 

      Mora Rodríguez, Patricia; Porra Chaverri, Mariela (2008)
      The Thermoluminescence Personal Dosimetry Laboratory of the University of Costa Rica provides dose measurements for around 90% of occupational radiation workers in the country. The assessment of doses to workers routinely ...

    • Cálculo del corrimiento al rojo fotométrico de galaxias submilimétricas alrededor de galaxias de núcleos activos 

      Chaverri Miranda, Fabián (2022)
      Las galaxias submilimétricas (SMGs) son fuentes que se detectaron por primera vez en los años 90 y se volvieron de mucho interés para la comunidad astronómica debido a sus altas tasas de formación estelar y sus altos ...

    • OpenDose: Open access resources for nuclear medicine dosimetry 

      Chauvin, Maxime; Borys, Damian; Botta, Francesca; Bzowski, Pawel; Dabin, Jérémie; Denis Bacelar, Ana M.; Desbrée, Aurélie; Falzone, Nadia; Lee, Boon Quan; Mariani, Andrea; Malaroda, Alessandra; Mathieu, Gilles; McKay, Erin; Mora Ramírez, Erick; Robinson, Andrew P.; Sarrut, David; Struelens, Lara; Vergara Gil, Alex; Bardiès, Manuel (2020)
      Radiopharmaceutical dosimetry depends on the localization in space and time of radioactive sources and requires the estimation of the amount of energy emitted by the sources deposited within targets. In particular, when ...

    • Sesión "Medicina nuclear" 

      Estrada Lobato, Enrique; Alonso Farto, Juan Carlos; De Haro Del Moral, Francisco Javier; Cerci, Juliano Julio; Rodríguez Pérez, J. L.; Vázquez Peña, E.; Godinho, F.; Mora Ramírez, Erick; Tinoco Mezquita, F.; Mut Bastos, F.; Savio Quevedo, Eduardo; Penedo Ojea, M. ; Ramírez Quijada, R. (2017-01)
      En la sesión dedicada a la Medicina Nuclear (MN) se identificaron los cinco aspectos que se consideran más problemáticos en la protección radiológica en MN. Estos hacen referencia a: 1. Garantizar que la dosis administrada ...

    • Evaluation of [18F] FNM biodistribution and dosimetry based on whole-body PET imaging of rats 

      Salabert, Anne Sophie; Mora Ramírez, Erick; Beaurain, Marie; Alonso, Mathieu; Fontan, Charlotte; Tahar, Hafid Belhadj; Boizeau, Marie Laure; Tafani, Mathieu; Bardiès, Manuel; Payoux, Pierre (2018)
      Introduction: The aim of this work was to study the biodistribution, metabolism and radiation dosimetry of rats injected with [18F]FNM using PET/CT images. This novel radiotracer targeting NMDA receptor has potential ...

    • Dosimetry and Toxicity Studies of the Novel Sulfonamide Derivative of Sulforhodamine 101([18f]srf101) at a Preclinical Level 

      Kreimerman, Ingrid; Mora Ramírez, Erick; Reyes, Laura; Bardiès, Manuel; Savio Quevedo, Eduardo; Engler, Henry (2019)
      Abstract: Background: The SR101 N-(3-[18F]Fluoropropyl) sulfonamide ([18F]SRF101) is a Sul forhodamine 101 derivative that was previously synthesised by our group. The fluorescent dye SR101 has been reported as a marker ...

    • Implementation of patient dosimetry in the clinical practice after targeted radiotherapy using [177Lu-[DOTATO,Tyr3]-octreotate 

      Santoro, Lore; Mora Ramírez, Erick; Trauchessec, Dorian; Chouaf, Soufiane; Eustache, Pierre; Pouget, Jean-Pierre; Kotzki, Pierre-Olivier; Bardiès, Manuel; Deshayes, Emmanuel (2018-11-29)
      Background: This study’s aim was to develop our dosimetric methodology using a commercial workstation for the routine evaluation of the organs at risk during peptide receptor radionuclide therapy (PRRT) with 177Lu. Methods: ...