Show simple item record

dc.contributor.authorAlzahrani, H
dc.contributor.authorRichards, S
dc.contributor.authorSedgwick, I
dc.contributor.authorSeller, P
dc.contributor.authorKonstantinidis, Anastasios C
dc.contributor.authorRoyle, G
dc.contributor.authorRicketts, K
dc.date.accessioned2020-08-10T08:09:26Z
dc.date.available2020-08-10T08:09:26Z
dc.date.issued2020en
dc.identifier.citationAlzahrani H, Richards S, Sedgwick I, Seller P, Konstantinidis A, Royle G, et al. Image quality determination of a novel digital detector for X-ray imaging and cone-beam computed tomography applications. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2020;968:163914.en
dc.identifier.pmidNo PMIDen
dc.identifier.doi10.1016/j.nima.2020.163914en
dc.identifier.urihttp://hdl.handle.net/10541/623128
dc.description.abstractThe demand for adequate image quality with low radiation doses for patients has greatly increased. This is especially true in the case of position verification in radiotherapy which requires a high number of images per patient. This study presents a physical characterisation of a new clinical detector named “Lassena (CsI)” based on a thick layer of structured thallium activated caesium iodide and complementary metal-oxide semiconductor technology with active pixel sensor architecture for general X-ray imaging and cone-beam computed tomography (CBCT) applications. We made a critical appraisal of its performance for the first time and determined its signal transfer property (STP) and its detective quantum efficiency (DQE) by acquiring the pre-sampling modulation transfer function (pMTF) and normalised noise power spectrum (NNPS) in addition to the dark current calculation. The investigation was conducted with the application of three X-ray beam qualities: (50 kV (RQA3), 70 kV (RQA5) and 90 kV (RQA7)) in compliance with the International Electrotechnical Commission (IEC 62220-1(2003)) standard. The STP was found to be linear with the coefficient of determination (R²) more than 0.9995 in all cases. The spatial resolution and NNPS results led to acceptable DQE values at all energies; in particular the DQE values at 0.5 line pairs per mm (DQE(0.5)) which were 0.46 for RQA3, 0.52-0.56 for RQA5 and 0.55-0.59 for RQA7. Lastly, the dark current was 2.51 pA/cm² for a 50?m pixel pitch. For CBCT applications, Lassena (CsI) showed very promising results.en
dc.language.isoenen
dc.relation.urlhttps://dx.doi.org/10.1016/j.nima.2020.163914en
dc.titleImage quality determination of a novel digital detector for X-ray imaging and cone -beam computed tomography applicationsen
dc.typeMeetings and Proceedingsen
dc.contributor.departmentResearch Department of Tissue and Energy, Division of Surgery and Interventional Science, University College London, Londonen
dc.identifier.journalNuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipmenten
dc.description.noteen]


Files in this item

This item appears in the following Collection(s)

Show simple item record