DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lee, Daehee | ko |
dc.contributor.author | Park, Kyungjin | ko |
dc.contributor.author | Lim, Kyung Taek | ko |
dc.contributor.author | Cho, Gyuseong | ko |
dc.date.accessioned | 2017-06-05T02:03:57Z | - |
dc.date.available | 2017-06-05T02:03:57Z | - |
dc.date.created | 2017-05-22 | - |
dc.date.created | 2017-05-22 | - |
dc.date.issued | 2017-06 | - |
dc.identifier.citation | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, v.856, pp.36 - 46 | - |
dc.identifier.issn | 0168-9002 | - |
dc.identifier.uri | http://hdl.handle.net/10203/223820 | - |
dc.description.abstract | A photon counting detector (PCD) has been proposed as an alternative solution to an energy-integrating detector (RID) in medical imaging field due to its high resolution, high efficiency, and low noise. The PCD has expanded to variety of fields such as spectral CT, k-edge imaging, and material decomposition owing to its capability to count and measure the number and the energy of an incident photon, respectively. Nonetheless, pulse pile-up, which is a superimposition of pulses at the output of a charge sensitive amplifier (CSA) in each PC pixel, occurs frequently as the X-ray flux increases due to the finite pulse processing time (PPT) in CSAs. Pulse pile-up induces not only a count loss but also distortion in the measured X-ray spectrum from each PC pixel and thus it is a main constraint on the use of PCDs in high flux X-ray applications. To minimize these effects, an energy-correction PC (ECPC) pixel is proposed to resolve pulse pile-up without cutting off the PPT by adding an energy correction logic (ECL) via a cross detection method (CDM). The ECPC pixel with a size of 200x200 mu m(2) was fabricated by using a 6-metal 1-poly 0.18 mu m CMOS process with a static power consumption of 7.2 mu W/pixel. The maximum count rate of the ECPC pixel was extended by approximately three times higher than that of a conventional PC pixel with a PPT of 500 nsec. The X-ray spectrum of 90 kVp, filtered by 3 mm Al filter, was measured as the X-ray current was increased using the CdTe and the ECPC pixel. As a result, the ECPC pixel dramatically reduced the energy spectrum distortion at 2 Mphotons/pixel/s when compared to that of the ERCP pixel with the same 500 nsec PPT. | - |
dc.language | English | - |
dc.publisher | ELSEVIER SCIENCE BV | - |
dc.subject | DETECTORS | - |
dc.subject | CHIP | - |
dc.subject | DISCRIMINATION | - |
dc.title | Energy-correction photon counting pixel for photon energy extraction under pulse pile-up | - |
dc.type | Article | - |
dc.identifier.wosid | 000400218700007 | - |
dc.identifier.scopusid | 2-s2.0-85014742617 | - |
dc.type.rims | ART | - |
dc.citation.volume | 856 | - |
dc.citation.beginningpage | 36 | - |
dc.citation.endingpage | 46 | - |
dc.citation.publicationname | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | - |
dc.identifier.doi | 10.1016/j.nima.2017.02.084 | - |
dc.contributor.localauthor | Cho, Gyuseong | - |
dc.description.isOpenAccess | N | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordAuthor | CdTe | - |
dc.subject.keywordAuthor | Energy-correction pixel, High X-ray flux | - |
dc.subject.keywordAuthor | Photon counting pixel | - |
dc.subject.keywordAuthor | Pulse pile-up | - |
dc.subject.keywordAuthor | X-ray | - |
dc.subject.keywordPlus | DETECTORS | - |
dc.subject.keywordPlus | CHIP | - |
dc.subject.keywordPlus | DISCRIMINATION | - |
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