Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes
We evaluated the sub-pixel position resolution achievable in large-volume CdZnTe pixelated detectors with conventional pixel patterns and for several different pixel sizes: 2.8 mm, 1.72 mm, 1.4 mm and 0.8 mm. Achieving position resolution below the physical dimensions of pixels (sub-pixel resolution...
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| Veröffentlicht in: | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2018-03, Vol.884, p.136-139 |
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| container_title | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment |
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| creator | Ocampo Giraldo, L. Bolotnikov, A.E. Camarda, G.S. De Geronimo, G. Fried, J. Gul, R. Hodges, D. Hossain, A. Ünlü, K. Vernon, E. Yang, G. James, R.B. |
| description | We evaluated the sub-pixel position resolution achievable in large-volume CdZnTe pixelated detectors with conventional pixel patterns and for several different pixel sizes: 2.8 mm, 1.72 mm, 1.4 mm and 0.8 mm. Achieving position resolution below the physical dimensions of pixels (sub-pixel resolution) is a practical path for making high-granularity position-sensitive detectors, |
| doi_str_mv | 10.1016/j.nima.2017.12.024 |
| format | Article |
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Savannah River National Lab. (SRNL) ; Brookhaven National Laboratory (BNL), Upton, NY (United States)</creatorcontrib><description>We evaluated the sub-pixel position resolution achievable in large-volume CdZnTe pixelated detectors with conventional pixel patterns and for several different pixel sizes: 2.8 mm, 1.72 mm, 1.4 mm and 0.8 mm. Achieving position resolution below the physical dimensions of pixels (sub-pixel resolution) is a practical path for making high-granularity position-sensitive detectors, <100 μm, using a limited number of pixels dictated by the mechanical constraints and multi-channel readout electronics. High position sensitivity is important for improving the imaging capability of CZT gamma cameras. It also allows for making more accurate corrections of response non-uniformities caused by crystal defects, thus enabling use of standard-grade (unselected) and less expensive CZT crystals for producing large-volume position-sensitive CZT detectors feasible for many practical applications. We analyzed the digitized charge signals from a representative 9 pixels and the cathode, generated using a pulsed-laser light beam focused down to 10 μm (650 nm) to scan over a selected 3×3 pixel area. We applied our digital pulse processing technique to the time-correlated signals captured from adjacent pixels to achieve and evaluate the capability for sub-pixel position resolution. As an example, we also demonstrated an application of 3D corrections to improve the energy resolution and positional information of the events for the tested detectors.</description><identifier>ISSN: 0168-9002</identifier><identifier>EISSN: 1872-9576</identifier><identifier>DOI: 10.1016/j.nima.2017.12.024</identifier><language>eng</language><publisher>United States: Elsevier B.V</publisher><subject>3D pixelated detectors ; CdZnTe ; Charge sharing ; Charge-loss correction ; Crystal defects ; High-granularity detectors ; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY ; MATERIALS SCIENCE ; OTHER INSTRUMENTATION</subject><ispartof>Nuclear instruments & methods in physics research. 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Savannah River National Lab. (SRNL)</creatorcontrib><creatorcontrib>Brookhaven National Laboratory (BNL), Upton, NY (United States)</creatorcontrib><title>Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes</title><title>Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment</title><description>We evaluated the sub-pixel position resolution achievable in large-volume CdZnTe pixelated detectors with conventional pixel patterns and for several different pixel sizes: 2.8 mm, 1.72 mm, 1.4 mm and 0.8 mm. Achieving position resolution below the physical dimensions of pixels (sub-pixel resolution) is a practical path for making high-granularity position-sensitive detectors, <100 μm, using a limited number of pixels dictated by the mechanical constraints and multi-channel readout electronics. High position sensitivity is important for improving the imaging capability of CZT gamma cameras. It also allows for making more accurate corrections of response non-uniformities caused by crystal defects, thus enabling use of standard-grade (unselected) and less expensive CZT crystals for producing large-volume position-sensitive CZT detectors feasible for many practical applications. We analyzed the digitized charge signals from a representative 9 pixels and the cathode, generated using a pulsed-laser light beam focused down to 10 μm (650 nm) to scan over a selected 3×3 pixel area. We applied our digital pulse processing technique to the time-correlated signals captured from adjacent pixels to achieve and evaluate the capability for sub-pixel position resolution. As an example, we also demonstrated an application of 3D corrections to improve the energy resolution and positional information of the events for the tested detectors.</description><subject>3D pixelated detectors</subject><subject>CdZnTe</subject><subject>Charge sharing</subject><subject>Charge-loss correction</subject><subject>Crystal defects</subject><subject>High-granularity detectors</subject><subject>INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY</subject><subject>MATERIALS SCIENCE</subject><subject>OTHER INSTRUMENTATION</subject><issn>0168-9002</issn><issn>1872-9576</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9kM1OxCAUhYnRxHH0BVwR961AaWkTN2b8TUxcOG7ckBZulUmFCTDq-AK-tnTqWjaXxXe-nByETinJKaHV-Sq35r3NGaEipywnjO-hGa0Fy5pSVPtolqA6awhhh-gohBVJrxH1DP08xY3eYtfjsOmytfmCAa9dMNE4iz0EN2x2308T33A075Ap5z0MbQSNo29tMGAjDubVtkPAxuLiCu80O2KhX-wSsIYIKjofJs9H67fGvk5cyn5DOEYHfRLAyd-do-eb6-XiLnt4vL1fXD5kqhA0ZqKkvOgI6JKXumMF67q-K2lNS0050Er3bS14VXCueNNyBbxWogJdtaqphYZijs4mrwvRyKBMKvamnLWpn6Sc8YbTBLEJUt6F4KGXa5_m9VtJiRz3lis57i3HvSVlMu2dQhdTCFL9DwN-tINVoI0f5dqZ_-K_rrOMig</recordid><startdate>20180311</startdate><enddate>20180311</enddate><creator>Ocampo Giraldo, L.</creator><creator>Bolotnikov, A.E.</creator><creator>Camarda, G.S.</creator><creator>De Geronimo, G.</creator><creator>Fried, J.</creator><creator>Gul, R.</creator><creator>Hodges, D.</creator><creator>Hossain, A.</creator><creator>Ünlü, K.</creator><creator>Vernon, E.</creator><creator>Yang, G.</creator><creator>James, R.B.</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>AAYXX</scope><scope>CITATION</scope><scope>OIOZB</scope><scope>OTOTI</scope></search><sort><creationdate>20180311</creationdate><title>Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes</title><author>Ocampo Giraldo, L. ; Bolotnikov, A.E. ; Camarda, G.S. ; De Geronimo, G. ; Fried, J. ; Gul, R. ; Hodges, D. ; Hossain, A. ; Ünlü, K. ; Vernon, E. ; Yang, G. ; James, R.B.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c371t-75143b0ed545db232bbfb51815d14e16dfa8746344c49a4ce48c76ed6ac987de3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>3D pixelated detectors</topic><topic>CdZnTe</topic><topic>Charge sharing</topic><topic>Charge-loss correction</topic><topic>Crystal defects</topic><topic>High-granularity detectors</topic><topic>INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY</topic><topic>MATERIALS SCIENCE</topic><topic>OTHER INSTRUMENTATION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ocampo Giraldo, L.</creatorcontrib><creatorcontrib>Bolotnikov, A.E.</creatorcontrib><creatorcontrib>Camarda, G.S.</creatorcontrib><creatorcontrib>De Geronimo, G.</creatorcontrib><creatorcontrib>Fried, J.</creatorcontrib><creatorcontrib>Gul, R.</creatorcontrib><creatorcontrib>Hodges, D.</creatorcontrib><creatorcontrib>Hossain, A.</creatorcontrib><creatorcontrib>Ünlü, K.</creatorcontrib><creatorcontrib>Vernon, E.</creatorcontrib><creatorcontrib>Yang, G.</creatorcontrib><creatorcontrib>James, R.B.</creatorcontrib><creatorcontrib>Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)</creatorcontrib><creatorcontrib>Brookhaven National Laboratory (BNL), Upton, NY (United States)</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV - Hybrid</collection><collection>OSTI.GOV</collection><jtitle>Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ocampo Giraldo, L.</au><au>Bolotnikov, A.E.</au><au>Camarda, G.S.</au><au>De Geronimo, G.</au><au>Fried, J.</au><au>Gul, R.</au><au>Hodges, D.</au><au>Hossain, A.</au><au>Ünlü, K.</au><au>Vernon, E.</au><au>Yang, G.</au><au>James, R.B.</au><aucorp>Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)</aucorp><aucorp>Brookhaven National Laboratory (BNL), Upton, NY (United States)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes</atitle><jtitle>Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment</jtitle><date>2018-03-11</date><risdate>2018</risdate><volume>884</volume><spage>136</spage><epage>139</epage><pages>136-139</pages><issn>0168-9002</issn><eissn>1872-9576</eissn><abstract>We evaluated the sub-pixel position resolution achievable in large-volume CdZnTe pixelated detectors with conventional pixel patterns and for several different pixel sizes: 2.8 mm, 1.72 mm, 1.4 mm and 0.8 mm. Achieving position resolution below the physical dimensions of pixels (sub-pixel resolution) is a practical path for making high-granularity position-sensitive detectors, <100 μm, using a limited number of pixels dictated by the mechanical constraints and multi-channel readout electronics. High position sensitivity is important for improving the imaging capability of CZT gamma cameras. It also allows for making more accurate corrections of response non-uniformities caused by crystal defects, thus enabling use of standard-grade (unselected) and less expensive CZT crystals for producing large-volume position-sensitive CZT detectors feasible for many practical applications. We analyzed the digitized charge signals from a representative 9 pixels and the cathode, generated using a pulsed-laser light beam focused down to 10 μm (650 nm) to scan over a selected 3×3 pixel area. We applied our digital pulse processing technique to the time-correlated signals captured from adjacent pixels to achieve and evaluate the capability for sub-pixel position resolution. As an example, we also demonstrated an application of 3D corrections to improve the energy resolution and positional information of the events for the tested detectors.</abstract><cop>United States</cop><pub>Elsevier B.V</pub><doi>10.1016/j.nima.2017.12.024</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 2018-03, Vol.884, p.136-139 |
| issn | 0168-9002 1872-9576 |
| language | eng |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | 3D pixelated detectors CdZnTe Charge sharing Charge-loss correction Crystal defects High-granularity detectors INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY MATERIALS SCIENCE OTHER INSTRUMENTATION |
| title | Study of sub-pixel position resolution with time-correlated transient signals in 3D pixelated CdZnTe detectors with varying pixel sizes |
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