UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Image quality determination of a novel digital detector for X-ray imaging and cone-beam computed tomography applications

Alzahrani, H; Richards, S; Sedgwick, I; Seller, P; Konstantinidis, A; Royle, G; Ricketts, K; (2020) 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 , 968 , Article 163914. 10.1016/j.nima.2020.163914. Green open access

[thumbnail of Alzahrani_1-s2.0-S0168900220304022-main.pdf]
Preview
Text
Alzahrani_1-s2.0-S0168900220304022-main.pdf - Accepted version

Download (2MB) | Preview

Abstract

The 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 50μm pixel pitch. For CBCT applications, Lassena (CsI) showed very promising results.

Type: Article
Title: Image quality determination of a novel digital detector for X-ray imaging and cone-beam computed tomography applications
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.nima.2020.163914
Publisher version: https://doi.org/10.1016/j.nima.2020.163914
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Signal-to-noise ratio, Detector characterisation, Image quality, DQE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Targeted Intervention
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10095907
Downloads since deposit
25Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item