Repository logo
 
Publication

PINPIN a-Si: H based structures for X-ray image detection using the laser scanning technique

2015-05-01Journal article Restricted access
Simple item page
dc.contributor.authorFernandes, Miguel
dc.contributor.authorVygranenko, Yuri
dc.contributor.authorVieira, Manuela
dc.date.accessioned2016-02-25T16:50:52Z
dc.date.available2016-02-25T16:50:52Z
dc.date.issued2015-05-01
dc.description.abstractConventional film based X-ray imaging systems are being replaced by their digital equivalents. Different approaches are being followed by considering direct or indirect conversion, with the later technique dominating. The typical, indirect conversion, X-ray panel detector uses a phosphor for X-ray conversion coupled to a large area array of amorphous silicon based optical sensors and a couple of switching thin film transistors (TFT). The pixel information can then be readout by switching the correspondent line and column transistors, routing the signal to an external amplifier. In this work we follow an alternative approach, where the electrical switching performed by the TFT is replaced by optical scanning using a low power laser beam and a sensing/switching PINPIN structure, thus resulting in a simpler device. The optically active device is a PINPIN array, sharing both front and back electrical contacts, deposited over a glass substrate. During X-ray exposure, each sensing side photodiode collects photons generated by the scintillator screen (560 nm), charging its internal capacitance. Subsequently a laser beam (445 nm) scans the switching diodes (back side) retrieving the stored charge in a sequential way, reconstructing the image. In this paper we present recent work on the optoelectronic characterization of the PINPIN structure to be incorporated in the X-ray image sensor. The results from the optoelectronic characterization of the device and the dependence on scanning beam parameters are presented and discussed. Preliminary results of line scans are also presented. (C) 2014 Elsevier B.V. All rights reserved.pt_PT
dc.identifier.citationFERNANDES, Miguel; VYGRANENKO, Yuri; VIEIRA, Manuela - PINPIN a-Si: H based structures for X-ray image detection using the laser scanning technique. Applied Surface Science. ISSN. 0169-4332. Vol. 336 (2015), pp. 222-225pt_PT
dc.identifier.doi10.1016/j.apsusc.2014.11.085pt_PT
dc.identifier.issn0169-4332
dc.identifier.issn1873-5584
dc.identifier.urihttp://hdl.handle.net/10400.21/5748
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevier Science BVpt_PT
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0169433214025665pt_PT
dc.subjectX-ray sensorpt_PT
dc.subjectLaser scanned photodiodept_PT
dc.subjectImage sensorpt_PT
dc.subjectAmorphous siliconpt_PT
dc.titlePINPIN a-Si: H based structures for X-ray image detection using the laser scanning techniquept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage225pt_PT
oaire.citation.startPage222pt_PT
oaire.citation.volume336pt_PT
person.familyNameFernandes
person.familyNameVygranenko
person.familyNameVieira
person.givenNameMiguel
person.givenNameYuri
person.givenNameManuela
person.identifier10792
person.identifier.ciencia-idDD1B-859F-EB0B
person.identifier.ciencia-id121C-05B4-3897
person.identifier.ciencia-id9516-E25E-BB8E
person.identifier.orcid0000-0002-0765-474X
person.identifier.orcid0000-0002-1819-5606
person.identifier.orcid0000-0002-1150-9895
person.identifier.ridV-7860-2017
person.identifier.scopus-author-id24450183800
person.identifier.scopus-author-id6701808217
person.identifier.scopus-author-id7202140173
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication6a72ab08-83fa-4225-be0e-b827f206a82e
relation.isAuthorOfPublication5471872c-b778-4218-9ac1-677868dd7d43
relation.isAuthorOfPublicationb77c6785-9cfb-4cd4-90b5-c2b816bd7d11
relation.isAuthorOfPublication.latestForDiscovery5471872c-b778-4218-9ac1-677868dd7d43

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
PINPIN a-Si.pdf
Size:
787.87 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

ISEL - Eng. Elect. Tel. Comp. - Artigos