Journal of Instrumentation最新文献_第2页

Optimizing and characterizing the Timepix2 hybrid pixel detector: enhancing performance and precision for scientific and industrial applications 优化和鉴定 Timepix2 混合像素探测器：提高科学和工业应用的性能和精度

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2024-01-01 DOI: 10.1088/1748-0221/19/01/C01007

D. Hladik, J. Jakůbek, K. Sykorova, T. Cerna, D. Doubravova, M. Urban, Š. Polansky

引用次数: 0

Feasibility of using 3D CZT drift strip detectors for small Compton camera space missions 在小型康普顿相机太空任务中使用 3D CZT 漂移条探测器的可行性

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2024-01-01 DOI: 10.1088/1748-0221/19/01/C01005

S. Owe, I. Kuvvetli, A. Zoglauer, C. Budtz-Jørgensen

{"title":"Feasibility of using 3D CZT drift strip detectors for small Compton camera space missions","authors":"S. Owe, I. Kuvvetli, A. Zoglauer, C. Budtz-Jørgensen","doi":"10.1088/1748-0221/19/01/C01005","DOIUrl":"https://doi.org/10.1088/1748-0221/19/01/C01005","url":null,"abstract":"This feasibility study explores the possibility of using 3D CZT drift strip detectors developed by DTU Space in a small Compton camera payload, with the primary objective of technology demonstration. We have defined a scalable mass model for the payload, comprising eight 3D CZT drift strip detectors surrounded by CsI scintillator detectors for active shielding. The payload's angular resolution, effective area, and efficiency are evaluated through simulations of far-field monochromatic point sources. The instrument's sensitivity is assessed in a low Earth orbit background environment for nuclear line and continuum emission sources. With a 3σ point source sensitivity in the order of 10-4 [ph/cm2/s], it is evident that such an instrument only allows for limited scientific goals. In-orbit simulations of bright sources are conducted, resulting in reasonable observation times for the Crab Nebula at a 5σ significance level. Furthermore, in-orbit simulations of a selection of bright gamma-ray bursts indicate the potential for observing bright transient events. The study underscores the potential of using 3D CZT drift strip detectors in Compton camera configurations but also highlights the need for a larger effective area to improve sensitivity. However, for a technology demonstration aimed at increasing the Technology Readiness Level of the 3D CZT drift strip detector, a small Compton camera configuration like the one presented in this study could be a viable solution.","PeriodicalId":16184,"journal":{"name":"Journal of Instrumentation","volume":"55 11","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139394506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of organic glass scintillator bars and their potential for a hybrid neutron/gamma ray imaging system for proton radiotherapy range verification 有机玻璃闪烁条的特性及其用于质子放疗范围验证的中子/伽马射线混合成像系统的潜力

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2024-01-01 DOI: 10.1088/1748-0221/19/01/P01008

J. Turko, R. Beyer, A. Junghans, I. Meric, S.E. Mueller, G. Pausch, H.N. Ratliff, K. Römer, S. M. Schellhammer, L. Setterdahl, S. Urlass, A. Wagner, T. Kögler

{"title":"Characterization of organic glass scintillator bars and their potential for a hybrid neutron/gamma ray imaging system for proton radiotherapy range verification","authors":"J. Turko, R. Beyer, A. Junghans, I. Meric, S.E. Mueller, G. Pausch, H.N. Ratliff, K. Römer, S. M. Schellhammer, L. Setterdahl, S. Urlass, A. Wagner, T. Kögler","doi":"10.1088/1748-0221/19/01/P01008","DOIUrl":"https://doi.org/10.1088/1748-0221/19/01/P01008","url":null,"abstract":"For accurate and simultaneous imaging of fast neutrons (FNs) and prompt gamma rays (PGs) produced during proton therapy, the selection of a highly performant detector material is crucial. In this work, a promising candidate material known as organic glass scintillator (OGS) is characterized for this task. To this end, a precisely-timed source of neutrons and Bremsstrahlung radiation produced by the nELBE facility was used to study the light output and neutron/gamma ray pulse shape discrimination (PSD) properties of a 1 × 1 × 20 cm3 OGS bar with double-sided readout. Furthermore, the energy, timing, and depth-of-interaction (DOI) resolutions of 1 × 1 × 10 cm3 and 1 × 1 × 20 cm3 OGS and EJ-200 bars were characterized with radioactive sources. For electron-equivalent energies above 0.5 MeVee, OGS was found to have excellent PSD capabilities (figure-of-merit above 1.27), energy resolution (below 12%), coincident time resolution (below 500 ps), and DOI resolution (below 10 mm). This work establishes the data analysis methods required for hybrid FN/PG imaging using OGS, and demonstrates the materials' excellent performance for this application.","PeriodicalId":16184,"journal":{"name":"Journal of Instrumentation","volume":" 43","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139393165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tracking a moving point source using triple gamma imaging 利用三伽马成像技术跟踪移动点源

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2024-01-01 DOI: 10.1088/1748-0221/19/01/P01001

Mokhtar Chmeissani, Machiel Kolstein, G. Ariño-Estrada, J. Macias-Montero, C. Puigdengoles, Jorge García

{"title":"Tracking a moving point source using triple gamma imaging","authors":"Mokhtar Chmeissani, Machiel Kolstein, G. Ariño-Estrada, J. Macias-Montero, C. Puigdengoles, Jorge García","doi":"10.1088/1748-0221/19/01/P01001","DOIUrl":"https://doi.org/10.1088/1748-0221/19/01/P01001","url":null,"abstract":"With positron emission tomography (PET), the positron of a β + emitter radioisotope annihilates with a nearby electron producing a pair of back-to-back 511 keV gamma rays that can be detected in a scanner surrounding the point source. The position of the point source is somewhere along the Line of Response (LOR) that passes through the positions where the 511 keV gammas are detected. In standard PET, an image reconstruction algorithm is used to combine these LORs into a final image. This paper presents a new tomographic imaging technique to locate the position of a β + emitting point source without using a standard PET image reconstruction algorithm. The data were collected with a Proof-of-Concept (PoC) PET scanner which has high spatial and energy resolutions. The imaging technique presented in this paper uses events where a gamma undergoes Compton scattering. The positions and energies deposited by the Compton scattered gamma define the surface of a Compton cone (CC) which is the locus of all possible positions of the point source, allowed by the Compton kinematics. The position of the same point source is also located somewhere on the LOR. Therefore, the position of the point source is defined by the 3 gammas and is given by the intersection point of the LOR and the Compton cone inside the Field of View (FOV) of the scanner. We refer to this method as CC×LOR. This new technique can locate the point source with an uncertainty of about 1 mm, after collecting a minimum of 200 CC×LOR events.","PeriodicalId":16184,"journal":{"name":"Journal of Instrumentation","volume":" 28","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139393270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent advances in combined Positron Emission Tomography and Magnetic Resonance Imaging 正电子发射断层扫描和磁共振成像技术的最新进展

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2024-01-01 DOI: 10.1088/1748-0221/19/01/C01001

P. Galve, B. Rodriguez-Vila, J. Herraiz, V. García-Vázquez, N. Malpica, José Manuel Udías, A. Torrado-Carvajal

{"title":"Recent advances in combined Positron Emission Tomography and Magnetic Resonance Imaging","authors":"P. Galve, B. Rodriguez-Vila, J. Herraiz, V. García-Vázquez, N. Malpica, José Manuel Udías, A. Torrado-Carvajal","doi":"10.1088/1748-0221/19/01/C01001","DOIUrl":"https://doi.org/10.1088/1748-0221/19/01/C01001","url":null,"abstract":"Hybrid imaging modalities combine two or more medical imaging techniques offering exciting new possibilities to image the structure, function and biochemistry of the human body in far greater detail than has previously been possible to improve patient diagnosis. In this context, simultaneous Positron Emission Tomography and Magnetic Resonance (PET/MR) imaging offers great complementary information, but it also poses challenges from the point of view of hardware and software compatibility. The PET signal may interfere with the MR magnetic field and vice-versa, posing several challenges and constrains in the PET instrumentation for PET/MR systems. Additionally, anatomical maps are needed to properly apply attenuation and scatter corrections to the resulting reconstructed PET images, as well motion estimates to minimize the effects of movement throughout the acquisition. In this review, we summarize the instrumentation implemented in modern PET scanners to overcome these limitations, describing the historical development of hybrid PET/MR scanners. We pay special attention to the methods used in PET to achieve attenuation, scatter and motion correction when it is combined with MR, and how both imaging modalities may be combined in PET image reconstruction algorithms.","PeriodicalId":16184,"journal":{"name":"Journal of Instrumentation","volume":" 4","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139392848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimizing deep learning-based piled-up pulse height correction method for high radiation-field application 优化高辐射场应用中基于深度学习的堆积脉冲高度校正方法

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2023-12-01 DOI: 10.1088/1748-0221/18/12/C12002

W. Kim, K. Ko, S. Lee, J. Park, G. Song, K. Lim, G. Cho

{"title":"Optimizing deep learning-based piled-up pulse height correction method for high radiation-field application","authors":"W. Kim, K. Ko, S. Lee, J. Park, G. Song, K. Lim, G. Cho","doi":"10.1088/1748-0221/18/12/C12002","DOIUrl":"https://doi.org/10.1088/1748-0221/18/12/C12002","url":null,"abstract":"In high-radiation environments, measured pile-up pulses can lead to unavoidable issues such as total count loss and spectrum distortion. Additionally, the recording of large volumes of data within a short period makes real-time processing difficult. In this study, a deep learning-based pulse height estimation (PHE) method was optimized to perform pile-up signal correction in high-radiation fields. First, we adopted a previous deep-learning-based PHE method that allows for fast correction without being restricted to specific detectors. However, the peak-finding method was slightly modified to improve the count restoration rate. Moreover, the input data length of the deep learning model was optimized for convolutional neural networks (CNN) and deep neural networks (DNN) to achieve the maximum correction performance using minimal input data. A series of single pulses was experimentally obtained from a LaBr3 detector with a short decay time to prepare a dataset for training the deep learning models. The pile-up signals were generated by randomly synthesizing single pulses. Samples around their peaks were sliced using the peak-finding method and used as input data for the deep learning models. As a result of the optimization, the modified peak-finding method improved the count restoration rate compared to the previous method by effectively detecting the peaks of tail pile-up, and peak pile-up pulses. Furthermore, the input data length and region were optimized based on the performance evaluation of each deep learning model. Despite having a simpler architecture than the CNN model, the DNN model demonstrated excellent PHE performance. The results of this study showed the efficient and practical considerations necessary for applying pile-up signal correction in high-radiation fields.","PeriodicalId":16184,"journal":{"name":"Journal of Instrumentation","volume":" 10","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138617987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Feasibility study of a coded aperture imaging technique for position-sensitive muonic X-ray atomic ratio reconstruction 位置敏感μ介子 X 射线原子比重建编码孔径成像技术的可行性研究

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2023-12-01 DOI: 10.1088/1748-0221/18/12/T12007

Z.B. Lin, Z. Pan, Z. Wang, Z.Y. He, T.Y. Yang, Z. Chen, Y. Yuan, Z.C. Kang, F. Xie, Q. Li, J.D. Liu, B. Ye

{"title":"Feasibility study of a coded aperture imaging technique for position-sensitive muonic X-ray atomic ratio reconstruction","authors":"Z.B. Lin, Z. Pan, Z. Wang, Z.Y. He, T.Y. Yang, Z. Chen, Y. Yuan, Z.C. Kang, F. Xie, Q. Li, J.D. Liu, B. Ye","doi":"10.1088/1748-0221/18/12/T12007","DOIUrl":"https://doi.org/10.1088/1748-0221/18/12/T12007","url":null,"abstract":"A position-sensitive multi-compound inspection methodology using Muonic X-ray Emission Spectroscopic (μ-XES) element analysis is proposed due to the ability of the coded aperture imaging technique to maintain the relative intensity of X-rays. This methodology can simultaneously obtain the atomic ratio of different regions of the sample under study. Therefore, the mis-judgements of material compositions caused by averaging results can be reduced. The atomic ratio reconstruction quality is mainly related to X-ray counts (Nx ), atomic ratios of materials (AT ), size and placement of sample blocks. In this work, several different sample blocks made of light elements were designed by GEANT4 Monte Carlo (MC) simulations to study the influences of Nx , AT , size and placement of sample on atomic ratio reconstruction quality. In the inspection of multiple sample blocks, this methodology successfully distinguished the material compositions from different regions by reconstructing the atomic ratios of C/N and O/N. Moreover, this methodology can clearly image element blocks larger than 2 × 2 mm2.","PeriodicalId":16184,"journal":{"name":"Journal of Instrumentation","volume":"99 ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139016629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization study of NaI(Tl) γ-summing spectrometer NaI(Tl)γ-求和光谱仪的特性研究

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2023-12-01 DOI: 10.1088/1748-0221/18/12/P12014

Sathi Sharma

引用次数: 0

Forty years (1983–2023) with LAPD and for its future evolution 在洛杉矶警察局工作 40 年（1983-2023 年）及其未来发展

IF 1.3 4区工程技术

Journal of Instrumentation Pub Date : 2023-12-01 DOI: 10.1088/1748-0221/18/12/C12010

K. Muraoka

引用次数: 0

Application of the grade selection of X-ray events using machine learning for a CubeSat mission 在立方体卫星飞行任务中应用机器学习对 X 射线事件进行等级选择