Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5874307
M. Iatrou, J. Pack, R. Bhagalia, D. Beque, John Seamans
High temporal resolution and high spatial resolution are required to image the coronary arteries without motion artifacts. Several approaches have been pursued to achieve better temporal resolution including faster rotational speeds, and dual tube systems. In this paper, we present an alternative approach using motion estimation and compensation. The results demonstrate that the proposed methods can significantly reduce motion artifacts in coronary artery imaging.
{"title":"Coronary artery motion estimation and compensation: A feasibility study","authors":"M. Iatrou, J. Pack, R. Bhagalia, D. Beque, John Seamans","doi":"10.1109/NSSMIC.2010.5874307","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5874307","url":null,"abstract":"High temporal resolution and high spatial resolution are required to image the coronary arteries without motion artifacts. Several approaches have been pursued to achieve better temporal resolution including faster rotational speeds, and dual tube systems. In this paper, we present an alternative approach using motion estimation and compensation. The results demonstrate that the proposed methods can significantly reduce motion artifacts in coronary artery imaging.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"46 ","pages":"2819-2821"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91446621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5873926
F. Fiedler, T. Kormoll, A. Müller, W. Enghardt
RADIATION therapy is an important treatment modality in cancer therapy and new radiation species, like protons and light ions have the potential of increasing tumor conformality of irradiation. Such high precision radiotherapy treatment requires efficient quality assurance techniques. Therefore, the objective of these investigations is the development of a real time invivo dosimetry system for proton and ion beams. Proton and ion beams offer advantages over conventional treatment modalities, such as photons. Because of the way these particles deposit their energy on their path through tissue they allow for an increased dose deposition in the tumor volume and reduce the damage of the surrounding healthy tissue. However, the parameters of the ion beams must be calculated from models. Small changes in the irradiated volume will lead to a mismatch of the deposited dose maximum and the tumor. This causes missing dose in the tumor volume and potential damage to healthy tissue. Therefore, a dose monitoring system is highly desirable. Until now, the only clinically applied in-vivo dosimetry method for ion beams is Positron Emission Tomography (PET) [1]. Between 1997 and 2008, the in-beam PET method was used at the GSI Helmholtzzentrum f ¨ur Schwerionenforschung, Darmstadt, Germany, for monitoring the dose delivered by 12C beams. Due to inherent limitations of this method, a direct quantification of the delivered dose is not feasible. Therefore, another approach currently under investigation monitors the dose via the detection of prompt gamma rays. It has been shown by several groups [2], [3], [4] that monitoring of an ion beam treatment via photon measurement is possible. Because of the high energy of the produced gamma rays and the required spatial resolution, the favored technical solution is a Compton camera system. The project is aimed to design and construct such a camera, and evaluate if it could lead to clinical applications.
{"title":"Requirements on the instrumentation of a prompt gamma measuring device","authors":"F. Fiedler, T. Kormoll, A. Müller, W. Enghardt","doi":"10.1109/NSSMIC.2010.5873926","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5873926","url":null,"abstract":"RADIATION therapy is an important treatment modality in cancer therapy and new radiation species, like protons and light ions have the potential of increasing tumor conformality of irradiation. Such high precision radiotherapy treatment requires efficient quality assurance techniques. Therefore, the objective of these investigations is the development of a real time invivo dosimetry system for proton and ion beams. Proton and ion beams offer advantages over conventional treatment modalities, such as photons. Because of the way these particles deposit their energy on their path through tissue they allow for an increased dose deposition in the tumor volume and reduce the damage of the surrounding healthy tissue. However, the parameters of the ion beams must be calculated from models. Small changes in the irradiated volume will lead to a mismatch of the deposited dose maximum and the tumor. This causes missing dose in the tumor volume and potential damage to healthy tissue. Therefore, a dose monitoring system is highly desirable. Until now, the only clinically applied in-vivo dosimetry method for ion beams is Positron Emission Tomography (PET) [1]. Between 1997 and 2008, the in-beam PET method was used at the GSI Helmholtzzentrum f ¨ur Schwerionenforschung, Darmstadt, Germany, for monitoring the dose delivered by 12C beams. Due to inherent limitations of this method, a direct quantification of the delivered dose is not feasible. Therefore, another approach currently under investigation monitors the dose via the detection of prompt gamma rays. It has been shown by several groups [2], [3], [4] that monitoring of an ion beam treatment via photon measurement is possible. Because of the high energy of the produced gamma rays and the required spatial resolution, the favored technical solution is a Compton camera system. The project is aimed to design and construct such a camera, and evaluate if it could lead to clinical applications.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"97 1","pages":"1047-1049"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80549395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5874426
Wei Hu, Yong Choi, K. Hong, Jihoon Kang, Y. Huh, H. Lim, Sang Su Kim, Jiwoong Jung, Kyu Bom Kim, Byung-Tae Kim
We have previously reported that a brain PET using GAPD arrays was successfully developed. The brain PET consisted of 72 4 × 4 GAPD arrays combined with LYSO crystals (single pixel size: 3 mm × 3 mm). Each 4 GAPD arrays' output signals were sent to a 64:1 position decoder circuit (PDC) which detects the fastest gamma signal of 64 input channels. To further improve the PET system performance, several modifications were performed on the DAQ system: PET data from 3 DAQ cards were transferred and saved on one SDRAM module by rapid channel communication; parallel processing and multiplexing based FPGA algorithm was developed to detect true PET signals by real time; a more user-friendly GUI DAQ control program was developed to control 3 DAQ cards simultaneously; an accurate and fast coincidence sorting method containing 3 discrimination approaches (time, energy and line of response discriminations) was developed to improve image quality. To evaluate the improved DAQ system, several experiments were performed such as sensitivity measurement using a 25 μά Na-22 point source, spatial resolution measurement using ten F-18 line sources with different source-to-center distances (−8 cm, −6 cm, −4 cm, −2 cm, 0, 2 cm, 4 cm, 6 cm, 8 cm and 10 cm), PET images acquisition of hot rod phantom and Hoffman brain phantom. Experimental results showed that PET sensitivity of 2594 cps/ MBq at 30% energy window (350–650 kev) was achieved. Spatial resolution from 2.9 mm (center) to 5 mm (25 cm off-center) was acquired for ten different source-to-center distances. PET images of hot rod phantom and Hoffman brain phantom were successfully acquired with improved image quality. The DAQ system developed in this study allows to acquiring high quality PET images using GAPD arrays.
{"title":"Improved data acquisition system for brain PET using GAPD arrays","authors":"Wei Hu, Yong Choi, K. Hong, Jihoon Kang, Y. Huh, H. Lim, Sang Su Kim, Jiwoong Jung, Kyu Bom Kim, Byung-Tae Kim","doi":"10.1109/NSSMIC.2010.5874426","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5874426","url":null,"abstract":"We have previously reported that a brain PET using GAPD arrays was successfully developed. The brain PET consisted of 72 4 × 4 GAPD arrays combined with LYSO crystals (single pixel size: 3 mm × 3 mm). Each 4 GAPD arrays' output signals were sent to a 64:1 position decoder circuit (PDC) which detects the fastest gamma signal of 64 input channels. To further improve the PET system performance, several modifications were performed on the DAQ system: PET data from 3 DAQ cards were transferred and saved on one SDRAM module by rapid channel communication; parallel processing and multiplexing based FPGA algorithm was developed to detect true PET signals by real time; a more user-friendly GUI DAQ control program was developed to control 3 DAQ cards simultaneously; an accurate and fast coincidence sorting method containing 3 discrimination approaches (time, energy and line of response discriminations) was developed to improve image quality. To evaluate the improved DAQ system, several experiments were performed such as sensitivity measurement using a 25 μά Na-22 point source, spatial resolution measurement using ten F-18 line sources with different source-to-center distances (−8 cm, −6 cm, −4 cm, −2 cm, 0, 2 cm, 4 cm, 6 cm, 8 cm and 10 cm), PET images acquisition of hot rod phantom and Hoffman brain phantom. Experimental results showed that PET sensitivity of 2594 cps/ MBq at 30% energy window (350–650 kev) was achieved. Spatial resolution from 2.9 mm (center) to 5 mm (25 cm off-center) was acquired for ten different source-to-center distances. PET images of hot rod phantom and Hoffman brain phantom were successfully acquired with improved image quality. The DAQ system developed in this study allows to acquiring high quality PET images using GAPD arrays.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"104 1","pages":"3349-3352"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80559261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5874158
C. Bai, R. Conwell
Detector non-uniformity can potentially introduce detectable artifacts into SPECT images. The degree of non-uniformity and the position of the non-uniform area on the detector surface determine the position and severity of the introduced artifacts. The commonly used daily uniformity quality control (QC) procedure follows the NEMA methodology but acquires fewer counts than the latter specifies. It has three major drawbacks: (1) it does not report the locations and extension of the non-uniform areas on the detector surface; (2) it may report a non-uniformity value that is lower than the true value due to the use of a 9-point filter, and it makes the reported non-uniformity value vary with the extension of the nonuniform area. These two drawbacks are inherited from the NEMA methodology. The third drawback is that the noise due to the relatively low counts collected in daily uniformity QC does not allow the measurement of certain degrees of non-uniformity with adequate statistical significance, yet such non-uniformity can potentially introduce observable artifacts. In this work we propose a new methodology for daily uniformity QC for cardiac SPECT imaging using solid-state detectors. The new QC largely overcomes the above drawbacks of NEMA QC. In addition, the new procedure (1) can catch some detectors that pass the NEMA-based daily uniformity QC but can be nonuniform enough to introduce detectable artifacts and (2) reports the locations and extension of the non-uniform areas of the detectors, therefore, may allow a detector that fails the NEMA-based daily QC to be used for imaging without introducing artifacts in certain situations.
{"title":"New daily detector uniformity quality control methodology for cardiac SPECT using solid-state detectors","authors":"C. Bai, R. Conwell","doi":"10.1109/NSSMIC.2010.5874158","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5874158","url":null,"abstract":"Detector non-uniformity can potentially introduce detectable artifacts into SPECT images. The degree of non-uniformity and the position of the non-uniform area on the detector surface determine the position and severity of the introduced artifacts. The commonly used daily uniformity quality control (QC) procedure follows the NEMA methodology but acquires fewer counts than the latter specifies. It has three major drawbacks: (1) it does not report the locations and extension of the non-uniform areas on the detector surface; (2) it may report a non-uniformity value that is lower than the true value due to the use of a 9-point filter, and it makes the reported non-uniformity value vary with the extension of the nonuniform area. These two drawbacks are inherited from the NEMA methodology. The third drawback is that the noise due to the relatively low counts collected in daily uniformity QC does not allow the measurement of certain degrees of non-uniformity with adequate statistical significance, yet such non-uniformity can potentially introduce observable artifacts. In this work we propose a new methodology for daily uniformity QC for cardiac SPECT imaging using solid-state detectors. The new QC largely overcomes the above drawbacks of NEMA QC. In addition, the new procedure (1) can catch some detectors that pass the NEMA-based daily uniformity QC but can be nonuniform enough to introduce detectable artifacts and (2) reports the locations and extension of the non-uniform areas of the detectors, therefore, may allow a detector that fails the NEMA-based daily QC to be used for imaging without introducing artifacts in certain situations.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"3 1","pages":"2138-2143"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83708675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5873873
H. Igarashi, T. Sumiyoshi, N. Ishihara, H. Iwase, T. Inagaki, T. Ohama, Y. Kato, Y. Kondou, Kasuke Takahashi, S. Takeda, T. Haruyama, Y. Makida, Yoshikazu Yamada, M. Kawai, T. Ishizuka, S. Kitamura, Y. Teramoto, Y. Sakamoto, I. Nakano, Y. Nagasaka, N. Tamura, Koichi Tanaka, R. Ito, M. Tonooka
DCBA(Drift Chamber Beta-ray Analyzer) experiment is aiming to search for neutrinoless double beta decay (0νββ). The DCBA detector is a momentum analyzer to measure individual electron energy from double beta decays. Since 0νββ is extremely rare, the detector must be low background and accommodate a lot of decays source. And also the excellent energy resolution is required at the Q-value to distinguish 0νββ from two-neutrino double beta decay (2νββ). The DCBA detector consists of drift chambers, a magnet and cosmic-ray veto counters. A test prototype DCBA-T2 has been constructed and operated with natural Mo source containing 9.6% 100Mo in order to solve operation problems. Another new prototype called DCBA-T3 is under construction at KEK. DCBA-T3 will have better performance than DCBA-T2 in view points of the energy resolution and the source accommodation volume. The results of the DCBA-T2 test operation and the DCBA-T3 status are described together with the future plan temporarily called Magnetic Tracking Detector (MTD), which is designed based on the experiences of DCBA-T2 and T3.
{"title":"Development of 3D tracking detectors in the DCBA experiment for studies of double beta decays","authors":"H. Igarashi, T. Sumiyoshi, N. Ishihara, H. Iwase, T. Inagaki, T. Ohama, Y. Kato, Y. Kondou, Kasuke Takahashi, S. Takeda, T. Haruyama, Y. Makida, Yoshikazu Yamada, M. Kawai, T. Ishizuka, S. Kitamura, Y. Teramoto, Y. Sakamoto, I. Nakano, Y. Nagasaka, N. Tamura, Koichi Tanaka, R. Ito, M. Tonooka","doi":"10.1109/NSSMIC.2010.5873873","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5873873","url":null,"abstract":"DCBA(Drift Chamber Beta-ray Analyzer) experiment is aiming to search for neutrinoless double beta decay (0νββ). The DCBA detector is a momentum analyzer to measure individual electron energy from double beta decays. Since 0νββ is extremely rare, the detector must be low background and accommodate a lot of decays source. And also the excellent energy resolution is required at the Q-value to distinguish 0νββ from two-neutrino double beta decay (2νββ). The DCBA detector consists of drift chambers, a magnet and cosmic-ray veto counters. A test prototype DCBA-T2 has been constructed and operated with natural Mo source containing 9.6% 100Mo in order to solve operation problems. Another new prototype called DCBA-T3 is under construction at KEK. DCBA-T3 will have better performance than DCBA-T2 in view points of the energy resolution and the source accommodation volume. The results of the DCBA-T2 test operation and the DCBA-T3 status are described together with the future plan temporarily called Magnetic Tracking Detector (MTD), which is designed based on the experiences of DCBA-T2 and T3.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"18 1","pages":"819-821"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83757865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5874036
P. Pangaud, D. Arutinov, M. Barbero, P. Breugnon, B. Chantepie, J. Clémens, R. Fei, D. Fougeron, M. Garcia-Sciveres, S. Godiot, T. Hemperek, M. Karagounis, H. Kruger, A. Mekkaoui, L. Perrot, S. Rozanov, N. Wermes
Vertex detectors for High Energy Physics experiments require pixel detectors featuring high spatial resolution, very good signal to noise ratio and radiation hardness. A way to face new challenges of ATLAS/SLHC future hybrid pixel vertex detectors is to use the emerging 3-D Integrated Technologies. However, commercial offers of such technologies are only very few and the 3-D designer's choice is then hardly constrained. Moreover, as radiation hardness and specially SEU tolerance of configuration registers is a crucial issue for SLHC vertex detectors and, as commercial data on this point are always missing, a reliable qualification program is to be developed for any candidate technology. We will present the design and test (including radiation tests with 70 kV, 60W X-Ray source and 24 GeV protons) of Chartered, 130nm Low Power 2-D chips realized for this qualification.
{"title":"Test results and irradiation performances of 3-D circuits developed in the framework of ATLAS hybrid pixel upgrade","authors":"P. Pangaud, D. Arutinov, M. Barbero, P. Breugnon, B. Chantepie, J. Clémens, R. Fei, D. Fougeron, M. Garcia-Sciveres, S. Godiot, T. Hemperek, M. Karagounis, H. Kruger, A. Mekkaoui, L. Perrot, S. Rozanov, N. Wermes","doi":"10.1109/NSSMIC.2010.5874036","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5874036","url":null,"abstract":"Vertex detectors for High Energy Physics experiments require pixel detectors featuring high spatial resolution, very good signal to noise ratio and radiation hardness. A way to face new challenges of ATLAS/SLHC future hybrid pixel vertex detectors is to use the emerging 3-D Integrated Technologies. However, commercial offers of such technologies are only very few and the 3-D designer's choice is then hardly constrained. Moreover, as radiation hardness and specially SEU tolerance of configuration registers is a crucial issue for SLHC vertex detectors and, as commercial data on this point are always missing, a reliable qualification program is to be developed for any candidate technology. We will present the design and test (including radiation tests with 70 kV, 60W X-Ray source and 24 GeV protons) of Chartered, 130nm Low Power 2-D chips realized for this qualification.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"79 1","pages":"1551-1555"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83781760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5873832
M. Benoit, A. Lounis, N. Dinu
We present a model for the TCAD simulation of charge multiplication and trap-to-band tunneling to explain the discrepancies between the experimentally observed charge collection in highly irradiated planar pixel sensors and the predictions made using the Hamburg model. DC and transient TCAD simulations of one dimensional n-in-p diodes were performed and reproduce well the observed behavior of diode irradiated to fluences of the order of 1015–16 neq cm−2. The results of the simulations show that impact ionization and de-trapping due to tunneling qualitatively explain the behavior of irradiated sensors observed experimentally.
{"title":"Simulation of charge multiplication and trap-assisted tunneling in irradiated planar pixel sensors","authors":"M. Benoit, A. Lounis, N. Dinu","doi":"10.1109/NSSMIC.2010.5873832","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5873832","url":null,"abstract":"We present a model for the TCAD simulation of charge multiplication and trap-to-band tunneling to explain the discrepancies between the experimentally observed charge collection in highly irradiated planar pixel sensors and the predictions made using the Hamburg model. DC and transient TCAD simulations of one dimensional n-in-p diodes were performed and reproduce well the observed behavior of diode irradiated to fluences of the order of 1015–16 neq cm−2. The results of the simulations show that impact ionization and de-trapping due to tunneling qualitatively explain the behavior of irradiated sensors observed experimentally.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"4 1","pages":"612-616"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79209136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5874120
E. Gimenez, R. Ballabriga, M. Campbell, I. Dolbnya, I. Horswell, X. Llopart, J. Marchal, K. Sawhney, N. Tartoni, D. Turecek
Synchrotron applications such as coherent X-ray diffraction and X-ray photon-correlation spectroscopy require detectors with a pixel pitch of 50 μm as highlighted by a survey with beamline scientists of Diamond Light Source synchrotron. Furthermore, the detector should also have a high frame rate, large dynamic range and large detection efficiency. The Medipix3 readout chip with a pixel pitch of 55 μm emerged as a good candidate to develop a new detector for the aforementioned applications. Additionally, it implements a new operating mode, referred to as Charge Summing Mode (CSM), with the purpose of eliminating charge-shared events. This mode can be very useful in this case, since the charge-sharing effect increases as the detector pixel size decreases. Also, its design is expected to be more radiation hard that its predecessor Medipix2. The present work focuses on the evaluation of the radiation hardness and the CSM operating mode of a Medipix3-based detector in order to develop a large area detector for synchrotron applications.
{"title":"Evaluation of the radiation hardness and Charge Summing Mode of a Medipix3-based detector with synchrotron radiation","authors":"E. Gimenez, R. Ballabriga, M. Campbell, I. Dolbnya, I. Horswell, X. Llopart, J. Marchal, K. Sawhney, N. Tartoni, D. Turecek","doi":"10.1109/NSSMIC.2010.5874120","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5874120","url":null,"abstract":"Synchrotron applications such as coherent X-ray diffraction and X-ray photon-correlation spectroscopy require detectors with a pixel pitch of 50 μm as highlighted by a survey with beamline scientists of Diamond Light Source synchrotron. Furthermore, the detector should also have a high frame rate, large dynamic range and large detection efficiency. The Medipix3 readout chip with a pixel pitch of 55 μm emerged as a good candidate to develop a new detector for the aforementioned applications. Additionally, it implements a new operating mode, referred to as Charge Summing Mode (CSM), with the purpose of eliminating charge-shared events. This mode can be very useful in this case, since the charge-sharing effect increases as the detector pixel size decreases. Also, its design is expected to be more radiation hard that its predecessor Medipix2. The present work focuses on the evaluation of the radiation hardness and the CSM operating mode of a Medipix3-based detector in order to develop a large area detector for synchrotron applications.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"24 1","pages":"1976-1980"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79701735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5873851
M. Pia, T. Basaglia, Z. Bell, P. Dressendorfer
A scientometric analysis has been performed on selected physics journals to estimate the presence of simulation and modeling in physics literature in the past fifty years. Correlations between the observed trends and several social and economical factors have been evaluated.
{"title":"The butterfly effect: Correlations between modeling in nuclear-particle physics and socioeconomic factors","authors":"M. Pia, T. Basaglia, Z. Bell, P. Dressendorfer","doi":"10.1109/NSSMIC.2010.5873851","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5873851","url":null,"abstract":"A scientometric analysis has been performed on selected physics journals to estimate the presence of simulation and modeling in physics literature in the past fifty years. Correlations between the observed trends and several social and economical factors have been evaluated.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"1 1","pages":"710-717"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83219684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-10-01DOI: 10.1109/NSSMIC.2010.5874473
Yanbo Zhang, X. Mou, Shao-jie Tang
In X-ray CT, Beam hardening (BH) effect, which is caused by polychromatic X-ray beam and energy-dependent attenuation coefficients, always introduces cupping and streak artifacts. Most of correction methods can only deal with beam hardening artifacts for a single material or dual-material object, but fail to correct in case of a multi-material object since the correction complexity and instability increase with the increase of the kinds of materials. In this paper, we proposed a multimaterial BH correction method. A binary Legendre polynomial is adopted to correct BH based on bi-parameter imaging physical model, and the Helgasson-Ludwig consistency condition (H-L consistency condition) is introduced to optimally determine the bi-parameters of all materials. In the simulation experiments showed that the proposed method can suppress the artifacts greatly. The corrected values approach very closely to the ideal ones.
{"title":"Beam hardening correction for fan-beam CT imaging with multiple materials","authors":"Yanbo Zhang, X. Mou, Shao-jie Tang","doi":"10.1109/NSSMIC.2010.5874473","DOIUrl":"https://doi.org/10.1109/NSSMIC.2010.5874473","url":null,"abstract":"In X-ray CT, Beam hardening (BH) effect, which is caused by polychromatic X-ray beam and energy-dependent attenuation coefficients, always introduces cupping and streak artifacts. Most of correction methods can only deal with beam hardening artifacts for a single material or dual-material object, but fail to correct in case of a multi-material object since the correction complexity and instability increase with the increase of the kinds of materials. In this paper, we proposed a multimaterial BH correction method. A binary Legendre polynomial is adopted to correct BH based on bi-parameter imaging physical model, and the Helgasson-Ludwig consistency condition (H-L consistency condition) is introduced to optimally determine the bi-parameters of all materials. In the simulation experiments showed that the proposed method can suppress the artifacts greatly. The corrected values approach very closely to the ideal ones.","PeriodicalId":13048,"journal":{"name":"IEEE Nuclear Science Symposuim & Medical Imaging Conference","volume":"172 1","pages":"3566-3570"},"PeriodicalIF":0.0,"publicationDate":"2010-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87292289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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