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Your search keyword '"Monolithic scintillators"' showing total 3 results
Start Over Descriptor "Monolithic scintillators" Publisher elsevier
3 results on '"Monolithic scintillators"'

1. Detector block performance based on a monolithic LYSO crystal using a novel signal multiplexing method

Author

Universitat Politècnica de València. Departamento de Ingeniería de Sistemas y Automática - Departament d'Enginyeria de Sistemes i Automàtica, Universitat Politècnica de València. Instituto Universitario Mixto de Biología Molecular y Celular de Plantas - Institut Universitari Mixt de Biologia Molecular i Cel·lular de Plantes, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Ministerio de Economía y Competitividad, González, A., Sánchez, F., Martí, Rosana, Hernández Hernández, Liczandro, Aguilar-Talens, Albert, BARBERA BALLESTER, JULIO, CATRET MASCARELL, JUAN VICENTE, Cañizares-Ledo, Gabriel, Conde-Castellanos, Pablo Eloy, Lamprou, Efthymios, Martos Pedrosa, Francisco, Sánchez-Góez, Sebastián, Vidal San Sebastian, Luis Fernando, Benlloch Baviera, Jose María, González Martínez, Antonio Javier, Universitat Politècnica de València. Departamento de Ingeniería de Sistemas y Automática - Departament d'Enginyeria de Sistemes i Automàtica, Universitat Politècnica de València. Instituto Universitario Mixto de Biología Molecular y Celular de Plantas - Institut Universitari Mixt de Biologia Molecular i Cel·lular de Plantes, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Ministerio de Economía y Competitividad, González, A., Sánchez, F., Martí, Rosana, Hernández Hernández, Liczandro, Aguilar-Talens, Albert, BARBERA BALLESTER, JULIO, CATRET MASCARELL, JUAN VICENTE, Cañizares-Ledo, Gabriel, Conde-Castellanos, Pablo Eloy, Lamprou, Efthymios, Martos Pedrosa, Francisco, Sánchez-Góez, Sebastián, Vidal San Sebastian, Luis Fernando, Benlloch Baviera, Jose María, and González Martínez, Antonio Javier

Abstract

[EN] Organ dedicated PET devices provide improved imaging performance when compared to whole body systems. The present study summarizes the test carried out to study a new detector block designed for an organ dedicated PET system. This block includes three novel components namely the scintillator geometry and a retroreflector layer coupled to the entrance face, the photosensor and the readout electronics. We used arrays of 12 x 12 SiPM photosensors with 3 x 3 mm(2) active area each and a pitch of 4.2 mm. We are proposing a new readout electronics that permits to reduce the 12 row and columns signals to only 8 without significant detector performance degradation. This approach also allows for resolving radioactive sources in the whole volume of the proposed crystal, significantly reducing the edge effect that typically rejects these events. An overall spatial resolution of about 1.8 mm FWHM is obtained for the whole scintillation volume, with an average energy resolution of 13% FWHM and a photon depth of interaction resolution (FWHM) of 3.7 mm. (C) 2018 Elsevier B.V. All rights reserved.

Published
2018

2. Implementation and analysis of list mode algorithm using tubes of response on a dedicated brain and breast PET

Author

Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Matemática Aplicada - Departament de Matemàtica Aplicada, Ministerio de Ciencia e Innovación, Generalitat Valenciana, Centro para el Desarrollo Tecnológico Industrial, Moliner Martínez, Laura, Correcher, Carlos, González Martínez, Antonio Javier, Conde Castellanos, Pablo Eloy, Hernández Hernández, Liczandro, Orero Palomares, Abel, Rodríguez Álvarez, María José, Sánchez Martínez, Filomeno, Soriano Asensi, Antonio, Vidal San Sebastián, Luis Fernando, Benlloch Baviera, Jose María, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Matemática Aplicada - Departament de Matemàtica Aplicada, Ministerio de Ciencia e Innovación, Generalitat Valenciana, Centro para el Desarrollo Tecnológico Industrial, Moliner Martínez, Laura, Correcher, Carlos, González Martínez, Antonio Javier, Conde Castellanos, Pablo Eloy, Hernández Hernández, Liczandro, Orero Palomares, Abel, Rodríguez Álvarez, María José, Sánchez Martínez, Filomeno, Soriano Asensi, Antonio, Vidal San Sebastián, Luis Fernando, and Benlloch Baviera, Jose María

Abstract

In this work we present an innovative algorithm for the reconstruction of PET images based on the List-Mode (LM) technique which improves their spatial resolution compared to results obtained with current MLEM algorithms. This study appears as a part of a large project with the aim of improving diagnosis in early Alzheimer disease stages by means of a newly developed hybrid PET-MR insert. At the present, Alzheimer is the most relevant neurodegenerative disease and the best way to apply an effective treatment is its early diagnosis. The PET device will consist of several monolithic LYSO crystals coupled to SiPM detectors. Monolithic crystals can reduce scanner costs with the advantage to enable implementation of very small virtual pixels in their geometry. This is especially useful for LM reconstruction algorithms, since they do not need a pre-calculated system matrix. We have developed an LM algorithm which has been initially tested with a large aperture (186 mm) breast PET system. Such an algorithm instead of using the common lines of response, incorporates a novel calculation of tubes of response. The new approach improves the volumetric spatial resolution about a factor 2 at the border of the field of view when compared with traditionally used MLEM algorithm. Moreover, it has also shown to decrease the image noise, thus increasing the image quality. © 2012 Elsevier B.V. All rights reserved.

Published
2013

3. Implementation and analysis of list mode algorithm using tubes of response on a dedicated brain and breast PET

Author

Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Matemática Aplicada - Departament de Matemàtica Aplicada, Ministerio de Ciencia e Innovación, Generalitat Valenciana, Centro para el Desarrollo Tecnológico Industrial, Moliner Martínez, Laura, Correcher, Carlos, González Martínez, Antonio Javier, Conde Castellanos, Pablo Eloy, Hernández Hernández, Liczandro, Orero Palomares, Abel, Rodríguez Álvarez, María José, Sánchez Martínez, Filomeno, Soriano Asensi, Antonio, Vidal San Sebastián, Luis Fernando, Benlloch Baviera, Jose María, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Matemática Aplicada - Departament de Matemàtica Aplicada, Ministerio de Ciencia e Innovación, Generalitat Valenciana, Centro para el Desarrollo Tecnológico Industrial, Moliner Martínez, Laura, Correcher, Carlos, González Martínez, Antonio Javier, Conde Castellanos, Pablo Eloy, Hernández Hernández, Liczandro, Orero Palomares, Abel, Rodríguez Álvarez, María José, Sánchez Martínez, Filomeno, Soriano Asensi, Antonio, Vidal San Sebastián, Luis Fernando, and Benlloch Baviera, Jose María

Abstract

In this work we present an innovative algorithm for the reconstruction of PET images based on the List-Mode (LM) technique which improves their spatial resolution compared to results obtained with current MLEM algorithms. This study appears as a part of a large project with the aim of improving diagnosis in early Alzheimer disease stages by means of a newly developed hybrid PET-MR insert. At the present, Alzheimer is the most relevant neurodegenerative disease and the best way to apply an effective treatment is its early diagnosis. The PET device will consist of several monolithic LYSO crystals coupled to SiPM detectors. Monolithic crystals can reduce scanner costs with the advantage to enable implementation of very small virtual pixels in their geometry. This is especially useful for LM reconstruction algorithms, since they do not need a pre-calculated system matrix. We have developed an LM algorithm which has been initially tested with a large aperture (186 mm) breast PET system. Such an algorithm instead of using the common lines of response, incorporates a novel calculation of tubes of response. The new approach improves the volumetric spatial resolution about a factor 2 at the border of the field of view when compared with traditionally used MLEM algorithm. Moreover, it has also shown to decrease the image noise, thus increasing the image quality. © 2012 Elsevier B.V. All rights reserved.

Published
2013

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