Pub Date : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069768
G. Raselli, M. Babicz, V. Bellini, M. Bonesini, T. Cervi, A. Falcone, U. Kose, A. Menegolli, C. Montanari, M. Nessi, F. Pietropaolo, M. Rossella, M. Spanu, M. Torti, F. Tortorici, A. Zani
ICARUS T600 will become the far detector of the Short Baseline Neutrino program at FNAL (USA), which foresees three liquid argon time projection chambers along the Booster Neutrino Beam line. The apparatus is now under refurbishing at CERN. A new light detection system is foreseen, using four planes of photo-multiplier tubes (PMTs) with 90 units each. A first pre-series of 20 PMTs Hamamatsu R5912-MOD, 8 in. diameter suitable for cryogenic applications, was fully tested, both at room and at liquid argon temperature, to ensure good performance of the detector.
{"title":"Test and characterization of 20 pre-series hamamatsu R5916-MOD photomultiplier tubes for the ICARUS T600 detector","authors":"G. Raselli, M. Babicz, V. Bellini, M. Bonesini, T. Cervi, A. Falcone, U. Kose, A. Menegolli, C. Montanari, M. Nessi, F. Pietropaolo, M. Rossella, M. Spanu, M. Torti, F. Tortorici, A. Zani","doi":"10.1109/NSSMIC.2016.8069768","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069768","url":null,"abstract":"ICARUS T600 will become the far detector of the Short Baseline Neutrino program at FNAL (USA), which foresees three liquid argon time projection chambers along the Booster Neutrino Beam line. The apparatus is now under refurbishing at CERN. A new light detection system is foreseen, using four planes of photo-multiplier tubes (PMTs) with 90 units each. A first pre-series of 20 PMTs Hamamatsu R5912-MOD, 8 in. diameter suitable for cryogenic applications, was fully tested, both at room and at liquid argon temperature, to ensure good performance of the detector.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123555971","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069900
F. Dulucq, C. de La Taille, G. Martin-Chassard, N. Seguin-Moreau, L. Duflot, N. Morange, L. Serin, S. Simion
The readout electronics of the ATLAS Liquid Argon (LAr) Calorimeter (for the phase II of the high luminosity Large Hadron Collider at CERN) will be replaced and integrated in a single chip in order to reduce the power dissipation by an order of magnitude and to provide fully digital data. The cornerstone of the circuit is the preamplifier which is very demanding in terms of low noise, large dynamic range (at least 16 bits) and precise input impedance (25 or 50 Ohms) to terminate the cables from the detector. An innovative architecture is proposed to fulfill these requirements: a current conveyer and a single resistor are imbedded as feedback of a low noise amplifier. This architecture ensures accurate input impedance over a large frequency range (100MHz) as well as input current range (10mA). The noise remains low thanks to this architecture which acts as an “electronically cooled” resistor out of an ultra-low noise amplifier (0.4 n V / √Hz). This design provides at the same time a current and a voltage output which could be used as high and low gain paths. An anti-saturation system is embedded to switch off the high gain when is saturated. “LAUROC”, which stands for Liquid Argon Upgrade Read-Out Chip, represents the first step of this new chip development designed in TSMC 130nm technology by OMEGA. The chip was sent in fabrication in April and is expected during summer to be tested in laboratory on a test board developed by LAL group.
欧洲核子研究中心(CERN)高亮度大型强子对撞机第二阶段的ATLAS液氩量热计(LAr)的读出电子设备将被替换并集成到单个芯片中，以减少一个数量级的功耗并提供完全数字化的数据。电路的基石是前置放大器，它在低噪声，大动态范围(至少16位)和精确的输入阻抗(25或50欧姆)方面要求非常高，以终止来自检测器的电缆。为了满足这些要求，提出了一种创新的结构:将电流传输器和单个电阻作为低噪声放大器的反馈嵌入。该架构确保在大频率范围(100MHz)和输入电流范围(10mA)内精确的输入阻抗。由于这种结构可以作为超低噪声放大器(0.4 n V /√Hz)的“电子冷却”电阻，因此噪声仍然很低。该设计同时提供电流和电压输出，可作为高增益和低增益路径。嵌入式抗饱和系统在饱和时关闭高增益。“LAUROC”代表液态氩气升级读出芯片，代表了OMEGA采用台积电130nm技术设计的新芯片开发的第一步。该芯片于今年4月开始制造，预计今年夏天将在LAL集团开发的实验室测试板上进行测试。
{"title":"LAUROC: “A new electronically cooled line-terminating preamplifier for the ATLAS liquid argon calorimeter upgrade”","authors":"F. Dulucq, C. de La Taille, G. Martin-Chassard, N. Seguin-Moreau, L. Duflot, N. Morange, L. Serin, S. Simion","doi":"10.1109/NSSMIC.2016.8069900","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069900","url":null,"abstract":"The readout electronics of the ATLAS Liquid Argon (LAr) Calorimeter (for the phase II of the high luminosity Large Hadron Collider at CERN) will be replaced and integrated in a single chip in order to reduce the power dissipation by an order of magnitude and to provide fully digital data. The cornerstone of the circuit is the preamplifier which is very demanding in terms of low noise, large dynamic range (at least 16 bits) and precise input impedance (25 or 50 Ohms) to terminate the cables from the detector. An innovative architecture is proposed to fulfill these requirements: a current conveyer and a single resistor are imbedded as feedback of a low noise amplifier. This architecture ensures accurate input impedance over a large frequency range (100MHz) as well as input current range (10mA). The noise remains low thanks to this architecture which acts as an “electronically cooled” resistor out of an ultra-low noise amplifier (0.4 n V / √Hz). This design provides at the same time a current and a voltage output which could be used as high and low gain paths. An anti-saturation system is embedded to switch off the high gain when is saturated. “LAUROC”, which stands for Liquid Argon Upgrade Read-Out Chip, represents the first step of this new chip development designed in TSMC 130nm technology by OMEGA. The chip was sent in fabrication in April and is expected during summer to be tested in laboratory on a test board developed by LAL group.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123611692","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069633
G. Abbiendi, S. S. Chhibra
The alignment of muon chambers relative to each other and to the inner tracker is crucial to achieve the optimal performance of muon reconstruction at high momentum, in particular the best possible momentum measurement. With the energy and luminosity increase in LHC Run2, the high momentum muons have become more important for the searches of new particles with masses around the TeV scale. The muon reconstruction of the CMS experiment has been recently improved and made more robust with the introduction of alignment uncertainties on the positions and angles of the segments in the muon chambers. Not only does the momentum resolution improve at high energy, but, owing to the better quality of the muon track building and fit, also the trigger efficiency increases, especially in the initial phase of data-taking, after the opening and closure of the detector.
{"title":"Implementation of position and angle uncertainties in the muon reconstruction of the CMS experiment, and impact on the performance","authors":"G. Abbiendi, S. S. Chhibra","doi":"10.1109/NSSMIC.2016.8069633","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069633","url":null,"abstract":"The alignment of muon chambers relative to each other and to the inner tracker is crucial to achieve the optimal performance of muon reconstruction at high momentum, in particular the best possible momentum measurement. With the energy and luminosity increase in LHC Run2, the high momentum muons have become more important for the searches of new particles with masses around the TeV scale. The muon reconstruction of the CMS experiment has been recently improved and made more robust with the introduction of alignment uncertainties on the positions and angles of the segments in the muon chambers. Not only does the momentum resolution improve at high energy, but, owing to the better quality of the muon track building and fit, also the trigger efficiency increases, especially in the initial phase of data-taking, after the opening and closure of the detector.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"323 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123652446","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069552
J. Cates, C. Levin
The future of positron emission tomography (PET) is systems with ultra-precise coincidence time resolution (CTR) to advance time-of-flight PET (TOF-PET) performance. Current state-of-the-art commercial PET systems have 350-800 ps fullwidth-at-half-maximum (FWHM) timing performance, constraining annihilation events to lie somewhere within a 5–12 cm region along system detector response lines (LORs). This constraint is applied during the image reconstruction process to enhance image SNR for improved lesion detectability, increased accuracy and precision of lesion uptake measurements, less sensitivity to errors in data correction techniques (normalization, scatter, and attenuation corrections), lower injected dose, or shorter scan time. The effect of these improvements on image quality and accuracy scales with system CTR performance, and a long-standing milestone for the TOFPET community is to drive system CTR towards 100 ps FWHM (1.5 cm localization along LORs). At this level of performance, a factor of five improvement in SNR can be realized compared to non-TOF imaging, with a transformational impact on quantitative PET imaging in many count starved and contrast-limited scenarios. Traditional PET detector designs are not able to achieve this level of CTR performance, and thus new detector concepts and signal processing methods should be explored to advance system CTR
{"title":"Design concepts and characterization of a next generation clinical PET detector","authors":"J. Cates, C. Levin","doi":"10.1109/NSSMIC.2016.8069552","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069552","url":null,"abstract":"The future of positron emission tomography (PET) is systems with ultra-precise coincidence time resolution (CTR) to advance time-of-flight PET (TOF-PET) performance. Current state-of-the-art commercial PET systems have 350-800 ps fullwidth-at-half-maximum (FWHM) timing performance, constraining annihilation events to lie somewhere within a 5–12 cm region along system detector response lines (LORs). This constraint is applied during the image reconstruction process to enhance image SNR for improved lesion detectability, increased accuracy and precision of lesion uptake measurements, less sensitivity to errors in data correction techniques (normalization, scatter, and attenuation corrections), lower injected dose, or shorter scan time. The effect of these improvements on image quality and accuracy scales with system CTR performance, and a long-standing milestone for the TOFPET community is to drive system CTR towards 100 ps FWHM (1.5 cm localization along LORs). At this level of performance, a factor of five improvement in SNR can be realized compared to non-TOF imaging, with a transformational impact on quantitative PET imaging in many count starved and contrast-limited scenarios. Traditional PET detector designs are not able to achieve this level of CTR performance, and thus new detector concepts and signal processing methods should be explored to advance system CTR","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122025945","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069798
B. Bilki, Y. Onel, E. Tiras, J. Wetzel, D. Winn
Following the development of intrinsically radiation-hard scintillators, we exposed various scintillators tiles to gammas from a 137Cs source at the University of Iowa Hospitals and Clinics up to 1.4 and 14 Mrad. The results are within expectations and exhibit sufficiently high performance for implementations in the future/upgrade hadron/lepton collider detectors. Here we report on the nature of the irradiation tests and present the results of the laboratory measurements performed continuously for more than 60 days following the irradiation under various recovery conditions.
{"title":"Radiation damage studies of new intrinsically radiation-hard scintillators","authors":"B. Bilki, Y. Onel, E. Tiras, J. Wetzel, D. Winn","doi":"10.1109/NSSMIC.2016.8069798","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069798","url":null,"abstract":"Following the development of intrinsically radiation-hard scintillators, we exposed various scintillators tiles to gammas from a 137Cs source at the University of Iowa Hospitals and Clinics up to 1.4 and 14 Mrad. The results are within expectations and exhibit sufficiently high performance for implementations in the future/upgrade hadron/lepton collider detectors. Here we report on the nature of the irradiation tests and present the results of the laboratory measurements performed continuously for more than 60 days following the irradiation under various recovery conditions.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128184879","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069723
J. Lacy, Murari Regmi, A. Athanasiades, Christopher S. Martin, G. Vazquez-Flores, G. Ehlers
In previous projects funded by the DOE, Proportional Technologies, Inc. developed the basic design of a neutron imaging detector, based on the boron-coated straw technology, aimed to replace 3He tubes in large-scale neutron science instruments. Recent efforts have focused on automated production methods, including a critical 10B4C high volume sputter coating system, and automated in-line straw tube production system, in order to dramatically increase production capacity and reduce cost. A limited-scale prototype developed during Phase I of the project was operated successfully in the Cold Neutron Chopper Spectrometer (CNCS) at the SNS (ORNL) over a period of 6 months, for more than 2500 hours logging more than 200 million events. The prototype demonstrated longitudinal spatial resolution of 5.5 mm (FWHM), and good image uniformity (2%). A 5-layer deep, fully operational, imaging panel has been completed recently. The panel was installed in the CNCS instrument, and tested in real neutron scattering experiments. Results of detection efficiency over a range of neutron wavelengths, image uniformity, and time-of-flight distribution are reported.
在之前由美国能源部资助的项目中，比例技术公司开发了基于硼涂层吸管技术的中子成像探测器的基本设计，旨在取代大型中子科学仪器中的3He管。最近的努力集中在自动化生产方法上，包括关键的10B4C大批量溅射涂层系统和自动化在线吸管生产系统，以大幅提高生产能力并降低成本。在项目第一阶段开发的一个有限规模的原型在SNS (ORNL)的冷中子斩波光谱仪(CNCS)中成功运行了6个月，超过2500小时，记录了超过2亿次事件。样机的纵向空间分辨率为5.5 mm (FWHM)，图像均匀性良好(2%)。最近完成了一个5层深的、完全可操作的成像面板。该面板已安装在CNCS仪器中，并在实际中子散射实验中进行了测试。报告了在中子波长范围内的探测效率、图像均匀性和飞行时间分布的结果。
{"title":"Neutron imaging detector based on multiple layers of boron-coated straws","authors":"J. Lacy, Murari Regmi, A. Athanasiades, Christopher S. Martin, G. Vazquez-Flores, G. Ehlers","doi":"10.1109/NSSMIC.2016.8069723","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069723","url":null,"abstract":"In previous projects funded by the DOE, Proportional Technologies, Inc. developed the basic design of a neutron imaging detector, based on the boron-coated straw technology, aimed to replace 3He tubes in large-scale neutron science instruments. Recent efforts have focused on automated production methods, including a critical 10B4C high volume sputter coating system, and automated in-line straw tube production system, in order to dramatically increase production capacity and reduce cost. A limited-scale prototype developed during Phase I of the project was operated successfully in the Cold Neutron Chopper Spectrometer (CNCS) at the SNS (ORNL) over a period of 6 months, for more than 2500 hours logging more than 200 million events. The prototype demonstrated longitudinal spatial resolution of 5.5 mm (FWHM), and good image uniformity (2%). A 5-layer deep, fully operational, imaging panel has been completed recently. The panel was installed in the CNCS instrument, and tested in real neutron scattering experiments. Results of detection efficiency over a range of neutron wavelengths, image uniformity, and time-of-flight distribution are reported.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129681133","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069391
H. Simões, A. Lopes, P. Crespo
A new imaging technique, called orthogonal ray imaging, has been proposed to assist external-beam radiation therapy treatments. This technique consists in detecting radiation scattered in the patient and emitted perpendicularly to the incident beam axis. Since photon scattering in the patient occurs with higher intensity in tissues of higher density, a detection system (constituted by a multi-slice collimator and a photon detector) positioned perpendicularly to the beam axis yields a signal proportional to the photons that escaped the patient (i.e., a signal correlated with patient morphology). Unlike some of the other imaging techniques applied in treatments based on image-guided radiotherapy such as cone-beam computed tomography, OrthoCT does not require rotational irradiation of the target. This technique provides CT-like images with very-low dose, potentially sparing the healthy tissues around the target to an unnecessary irradiation (since rotation of X-ray source is not required). This system can potentially be useful to (1) on-board imaging, or (2) real-time radiotherapy monitoring. In this work, we report Geant4 simulation results with an anthropomorphic phantom to analyze the capability of OrthoCT in detecting pertinent and clinically relevant morphological variations during head irradiation. The counts distributions obtained show a good visual agreement with the simulated dose and the phantom structures.
{"title":"OrthoCT for tumor head irradiation: A simulation study","authors":"H. Simões, A. Lopes, P. Crespo","doi":"10.1109/NSSMIC.2016.8069391","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069391","url":null,"abstract":"A new imaging technique, called orthogonal ray imaging, has been proposed to assist external-beam radiation therapy treatments. This technique consists in detecting radiation scattered in the patient and emitted perpendicularly to the incident beam axis. Since photon scattering in the patient occurs with higher intensity in tissues of higher density, a detection system (constituted by a multi-slice collimator and a photon detector) positioned perpendicularly to the beam axis yields a signal proportional to the photons that escaped the patient (i.e., a signal correlated with patient morphology). Unlike some of the other imaging techniques applied in treatments based on image-guided radiotherapy such as cone-beam computed tomography, OrthoCT does not require rotational irradiation of the target. This technique provides CT-like images with very-low dose, potentially sparing the healthy tissues around the target to an unnecessary irradiation (since rotation of X-ray source is not required). This system can potentially be useful to (1) on-board imaging, or (2) real-time radiotherapy monitoring. In this work, we report Geant4 simulation results with an anthropomorphic phantom to analyze the capability of OrthoCT in detecting pertinent and clinically relevant morphological variations during head irradiation. The counts distributions obtained show a good visual agreement with the simulated dose and the phantom structures.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127402218","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069693
A. Sardet, B. Pérot, C. Carasco, G. Sannie, S. Moretto, G. Nebbia, C. Fontana, M. Moszynski, P. Sibczyński, K. Grodzicki, L. Swiderski, A. Iovene, C. Tintori
Within the framework of the European H2020 C-BORD project, aiming at improving container inspection technologies, a compact and “Rapidly Relocatable Tagged Neutron Inspection System”, called RRTNIS, is being developed taking into account past EURITRACK experience with a portal TNIS, and the latest technologies in terms of associated particle neutron generator and data acquisition electronics. A dedicated shield surrounding the neutron generator has been designed with MCNP6 to limit the size of the restricted area and the count rate on gamma detectors, which are located very close to the generator. This new design with “reflection” detectors only, i.e. in backscattering position, is indeed more efficient to detect suspect items, like explosives or illicit drugs, in bottom regions of the container, compared to EURITRACK detectors which were mainly located above the container. It also allows designing a relocatable system for different inspection sites like seaports, borders, or other checkpoints. Dose and count rate calculations are presented to determine the restricted area and facilitate the design of the data acquisition electronics, respectively.
{"title":"Design of the rapidly relocatable tagged neutron inspection system of the C-BORD project","authors":"A. Sardet, B. Pérot, C. Carasco, G. Sannie, S. Moretto, G. Nebbia, C. Fontana, M. Moszynski, P. Sibczyński, K. Grodzicki, L. Swiderski, A. Iovene, C. Tintori","doi":"10.1109/NSSMIC.2016.8069693","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069693","url":null,"abstract":"Within the framework of the European H2020 C-BORD project, aiming at improving container inspection technologies, a compact and “Rapidly Relocatable Tagged Neutron Inspection System”, called RRTNIS, is being developed taking into account past EURITRACK experience with a portal TNIS, and the latest technologies in terms of associated particle neutron generator and data acquisition electronics. A dedicated shield surrounding the neutron generator has been designed with MCNP6 to limit the size of the restricted area and the count rate on gamma detectors, which are located very close to the generator. This new design with “reflection” detectors only, i.e. in backscattering position, is indeed more efficient to detect suspect items, like explosives or illicit drugs, in bottom regions of the container, compared to EURITRACK detectors which were mainly located above the container. It also allows designing a relocatable system for different inspection sites like seaports, borders, or other checkpoints. Dose and count rate calculations are presented to determine the restricted area and facilitate the design of the data acquisition electronics, respectively.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131048475","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069571
Antonietta Sorriso, F. Baselice, G. Ferraioli, V. Pascazio
A novel approach for noise reduction in Magnetic Resonance Image field is proposed. The methodology adopts a Maximum A Posteriori estimator and exploits Markov Random Field theory for adapting the filter to the local nature of the image. Differently from other widely adopted filters, the proposed algorithm works in the complex domain, i.e., real and imaginary components of the acquired images are jointly processed and regularized. First results on a clinical dataset are reported, showing the interesting performances of the methodology.
{"title":"Bayesian MRI noise filtering in complex domain","authors":"Antonietta Sorriso, F. Baselice, G. Ferraioli, V. Pascazio","doi":"10.1109/NSSMIC.2016.8069571","DOIUrl":"https://doi.org/10.1109/NSSMIC.2016.8069571","url":null,"abstract":"A novel approach for noise reduction in Magnetic Resonance Image field is proposed. The methodology adopts a Maximum A Posteriori estimator and exploits Markov Random Field theory for adapting the filter to the local nature of the image. Differently from other widely adopted filters, the proposed algorithm works in the complex domain, i.e., real and imaginary components of the acquired images are jointly processed and regularized. First results on a clinical dataset are reported, showing the interesting performances of the methodology.","PeriodicalId":184587,"journal":{"name":"2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130478693","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 : 2016-10-01DOI: 10.1109/NSSMIC.2016.8069513
Bruce D. Smith
Smoothing is desirable in tomographic imaging when it reduces the effects of noise in the data and is undesirable when it smooths a small feature such as a tumor or a lesion so much that they become undetectable. Linear algebra can be used to identify a significant problem associated with reconstruction from incomplete data set; namely, the rank of the resulting system matrix is less then full. To maximize its benefit and to minimize its harm, when smoothing is used in this case, it seems desirable to give more credence to the row-space component of the reconstruction than the null-space because the tomographic data contains only information about the row-space component of the object. The objective of the work presented here is to propose and demonstrate a method, which is called null-space smoothing, for achieving this. The Methodology used involved computer generated data. ART is used to reconstruct the row-space component of the Shepp and Logan phantom. By solving a convex optimization problem, an image in the null-space was added to the reconstruction so that the resulting image had a minimum TV norm; thus, leaving the row-space component unchanged. It is concluded that although null-space smoothing can produce smooth images with an unchanged row-space component, more work needs to be done in the future to demonstrate its usefulness with real data.
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