2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)最新文献_第10页

CBCT image reconstruction of a moving target with an on-board imaging system for radiation therapy 基于车载放射治疗成像系统的运动目标CBCT图像重建

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829337

K. Usui, S. Kabuki, C. Kurokawa, S. Sugimoto, K. Sasai, E. Kunieda, K. Ogawa

{"title":"CBCT image reconstruction of a moving target with an on-board imaging system for radiation therapy","authors":"K. Usui, S. Kabuki, C. Kurokawa, S. Sugimoto, K. Sasai, E. Kunieda, K. Ogawa","doi":"10.1109/NSSMIC.2013.6829337","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829337","url":null,"abstract":"To accomplish accurate irradiation to a target, image information about the target is very useful in radiotherapy. A kilo-voltage cone-beam computed tomography (kV-CBCT) system mounted on a linear accelerator can verify the accuracy of the set-up position and the size and location of the target on each treatment day. However, the gantry of the CBCT system is heavy and so requires a long data acquisition time. As a result, image distortion occurs in the case of a moving target. In this study, we proposed a method to reconstruct a target less affected by any motion of the target, and evaluated the proposed method with a moving phantom. In our method, CBCT images of the moving phantom were acquired, and the target position in two directions was detected with a template matching method using these projection images. And we selected data acquisition angles of the projection images in which the target was located in predefined regions in the projection images, and made a sinogram with the projection image of selected angles. A less blurred image was reconstructed with a filtered-backprojection method from the sinogram. The results of experiments showed that the blurring caused by the movement of the phantom was reduced with our proposed method.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"140 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131450410","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}

引用次数: 0

Leading edge of the technological developments of Planar Pixel Sensors and prospects for ATLAS HL-LHC upgrade 平面像元传感器技术发展前沿及ATLAS HL-LHC升级展望

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829542

A. Lounis

{"title":"Leading edge of the technological developments of Planar Pixel Sensors and prospects for ATLAS HL-LHC upgrade","authors":"A. Lounis","doi":"10.1109/NSSMIC.2013.6829542","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829542","url":null,"abstract":"To investigate the suitability of pixel sensors using the proven planar technology for the upgraded tracker, the ATLAS Planar Pixel Sensor R&D Project was established comprising 18 institutes and more than 80 scientists. Main areas of research are the performance of planar pixel sensors at highest fluences, the exploration of possibilities for cost reduction to enable the instrumentation of large areas, the achievement of slim or active edges to provide low geometric inefficiencies without the need for shingling of modules and the investigation of the operation of highly irradiated sensors at low thresholds to increase the efficiency. Most important of the recent accomplishments obtained in research institutes members of the R&D project is given. In addition, the production of prototype sensors also for the outer layers has seen significant progress within the recent months and first characterization results will be shown. On the topic of edge efficiencies, substantial achievements have been made in view of planar active edges. We will show results from successful productions with two vendors. In addition, the status of the SCP post-processing technology will be summarized; this process could be applied to most sensors independent of their manufacturer which enables the creation of almost active edges even for originally non-slim-edge sensors.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131987754","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}

引用次数: 1

EndoTOFPET-US: Towards a multi-modal endoscope for Ultrasound and Time of Flight PET EndoTOFPET-US:用于超声和飞行时间PET的多模态内窥镜

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829146

M. Pizzichemi

引用次数: 1

Analysis of optimal CT spectrum for PET attenuation correction PET衰减校正的最佳CT谱分析

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829122

Xue Rui, Y. Long, E. Asma, A. Alessio, Paul Kinahan, B. De Man

{"title":"Analysis of optimal CT spectrum for PET attenuation correction","authors":"Xue Rui, Y. Long, E. Asma, A. Alessio, Paul Kinahan, B. De Man","doi":"10.1109/NSSMIC.2013.6829122","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829122","url":null,"abstract":"One advantage of a combined PET/CT scanner is that a fast CT acquisition provides a high quality attenuation correction map for PET reconstruction. A diagnostic CT system typically operates in a voltage range from 80 kVp to 140 kVp. The choice of optimal spectrum depends on the specific application. In diagnostic imaging, contrast, noise and dose all play important roles. The designated CT scan for PET attenuation correction has different image quality requirements compared to diagnostic CT. For example, at 511 keV, the contrast between different materials reduces significantly and there is typically no interest in distinguishing small contrast variations. On the other hand, it is important that the error on the attenuation map is small, and especially bias in the CT attenuation correction (CTAC) map could introduce significant artifacts in PET images which may affect clinical diagnosis. We are interested in operating the CT scanner at the lowest possible dose while still providing accurate attenuation correction. However, at these very low dose levels, the effects of electronic noise can become significant. In the study presented here, we analyzed the impacts of the X-ray tube voltage, current and filtration by metal filter on the quality of the CTAC by evaluating noise variance and bias at various dose levels.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130453698","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}

引用次数: 0

Ultra light drift chambers for precision physics 用于精密物理的超轻漂移室

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829601

M. Cascella, F. Grancagnolo, A. L’Erario, A. Miccoli, S. Rella, M. Spedicato, G. Tassielli

引用次数: 0

Silicon planar structures as detectors for microbeam radiation therapy 硅平面结构作为微束放射治疗的探测器

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829792

I. Anokhin, M. Lerch, M. Petasecca, O. Zinets, A. Rosenfeld

引用次数: 1

FlexToT - Current mode ASIC for readout of common cathode SiPM arrays 用于普通阴极SiPM阵列读出的电流模式ASIC

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829761

A. Comerma, D. Gascón, L. Freixas, L. Garrido, R. Graciani, J. Marı́n, G. Martinez, J. Pérez, P. Rato Mendes, J. Castilla, J. Cela, José María Fernéndez-Varea, I. Sarasola

{"title":"FlexToT - Current mode ASIC for readout of common cathode SiPM arrays","authors":"A. Comerma, D. Gascón, L. Freixas, L. Garrido, R. Graciani, J. Marı́n, G. Martinez, J. Pérez, P. Rato Mendes, J. Castilla, J. Cela, José María Fernéndez-Varea, I. Sarasola","doi":"10.1109/NSSMIC.2013.6829761","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829761","url":null,"abstract":"A front end application specific integrated circuit (ASIC) for the readout of common cathode Silicon Photo-Multipliers arrays is presented with the following features: wide dynamic range, high speed, multi channel, low input impedance current amplifier, low power (≈10mW per channel), common cathode connection, directly coupled input with common mode voltage control and separated timing and charge signal output.A 16 channel prototype with 16 independent outputs for energy and pile-up detection and a single fast timing output is described. The low jitter current mode processing together with a configurable differential current mode logic (CML) output provides a timing signal suitable for Time of Flight (TOF) applications, such as TOF-PET (Positron Emission Tomography). Each channel delivers a digital output of a Time Over Threshold (TOT) type with a pulse width proportional to peak current (charge) input. The current mode input stage features a novel double feedback; a low speed feedback loop keeps input node voltage constant while a higher speed feedback loop keeps input impedance low. Dedicated circuitry allows SiPM high over-voltage operation, thus maximizing Photon Detection Efficiency (PDE) and timing resolution. Design was submitted in June 2012 in Austria Microsystems (AMS) 0.35 μm HBT BiCMOS technology and is under test.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127618388","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}

引用次数: 25

Scintillation properties of ceramic Ce-doped Gd3(Ga,Al)5O12 ce掺杂Gd3(Ga,Al)5O12陶瓷的闪烁特性

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829666

T. Yanagida, Y. Fujimoto, H. Yagi, T. Yanagitani

引用次数: 0

Preliminary investigation of imaging properties for sub-millimeter square pinholes 亚毫米方针孔成像特性的初步研究

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829173

D. Xia, Mi-Ae Park, S. Moore, S. Metzler

{"title":"Preliminary investigation of imaging properties for sub-millimeter square pinholes","authors":"D. Xia, Mi-Ae Park, S. Moore, S. Metzler","doi":"10.1109/NSSMIC.2013.6829173","DOIUrl":"https://doi.org/10.1109/NSSMIC.2013.6829173","url":null,"abstract":"Recently, a square-pinhole collimator has been proposed for SPECT imaging since it can tile the projection onto the detector efficiently and the fields of view (FOVs) in transverse and axial directions become separable. In this work, we have conducted sensitivity and FOV experiments for eighteen fabricated platinum/iridium(Pt/Ir) inserts with sub-millimeter square-apertures. A sinqθ fit to the experimental sensitivity has been performed for these inserts. The mean (standard deviation) of fitted sensitivity exponents (q) and effective diameters (d) are 10.7 (1.3) and 0.35 mm (0.02 mm), which are close to the values obtained from the simulated sensitivity data generated using the geometric parameters of the designed inserts. From projections of the FOV on the detector, we have measured the acceptance angles in the transverse and axial directions. The measured mean (standard deviation) of transverse and axial half-acceptances are 17.33° (0.21°) and 15.03°(0.23°), which are in good agreement with the designed values (17.13° and 14.93°). These results show that the physical properties of the fabricated inserts with sub-millimeter aperture size match our design well.","PeriodicalId":246351,"journal":{"name":"2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130932791","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}

引用次数: 6

Radiation response of transition metals-doped lithium aluminate crystals 过渡金属掺杂铝酸锂晶体的辐射响应

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) Pub Date : 2013-10-01 DOI: 10.1109/NSSMIC.2013.6829660

Y. Fujimoto, T. Yanagida, K. Kamada, J. Pejchal

引用次数: 3