ACCURACY OF CT NUMBERS OBTAINED BY DIRA AND MONOENERGETIC PLUS ALGORITHMS IN DUAL-ENERGY COMPUTED TOMOGRAPHY.
- Resource Type
- Academic Journal
- Authors
- Magnusson M; Department of Electrical Engineering; Linköping University, SE-581 83, Linköping, Sweden.; Department of Health, Medicine and Caring Sciences; Linköping University, SE-581 83, Linköping, Sweden.; Center for Medical Image Science and Visualization (CMIV); Linköping University, SE-581 85, Linköping, Sweden.; Sandborg M; Department of Health, Medicine and Caring Sciences; Linköping University, SE-581 83, Linköping, Sweden.; Center for Medical Image Science and Visualization (CMIV); Linköping University, SE-581 85, Linköping, Sweden.; Alm Carlsson G; Department of Health, Medicine and Caring Sciences; Linköping University, SE-581 83, Linköping, Sweden.; Center for Medical Image Science and Visualization (CMIV); Linköping University, SE-581 85, Linköping, Sweden.; Henriksson L; Department of Health, Medicine and Caring Sciences; Linköping University, SE-581 83, Linköping, Sweden.; Center for Medical Image Science and Visualization (CMIV); Linköping University, SE-581 85, Linköping, Sweden.; Carlsson Tedgren Å; Department of Health, Medicine and Caring Sciences; Linköping University, SE-581 83, Linköping, Sweden.; Center for Medical Image Science and Visualization (CMIV); Linköping University, SE-581 85, Linköping, Sweden.; Department of Medical Radiation Physics and Nuclear Medicine; Karolinska University Hospital, SE-171 77, Stockholm, Sweden.; Malusek A; Department of Health, Medicine and Caring Sciences; Linköping University, SE-581 83, Linköping, Sweden.; Center for Medical Image Science and Visualization (CMIV); Linköping University, SE-581 85, Linköping, Sweden.
- Source
- Publisher: Oxford University Press Country of Publication: England NLM ID: 8109958 Publication Model: Print Cited Medium: Internet ISSN: 1742-3406 (Electronic) Linking ISSN: 01448420 NLM ISO Abbreviation: Radiat Prot Dosimetry Subsets: MEDLINE
- Subject
- Language
- English
Dual-energy computed tomography (CT) can be used in radiotherapy treatment planning for the calculation of absorbed dose distributions. The aim of this work is to evaluate whether there is room for improvement in the accuracy of the Monoenergetic Plus algorithm by Siemens Healthineers. A Siemens SOMATOM Force scanner was used to scan a cylindrical polymethyl methacrylate phantom with four rod-inserts made of different materials. Images were reconstructed using ADMIRE and processed with Monoenergetic Plus. The resulting CT numbers were compared with tabulated values and values simulated by the proof-of-a-concept algorithm DIRA developed by the authors. Both the Monoenergetic Plus and DIRA algorithms performed well; the accuracy of attenuation coefficients was better than about ±1% at the energy of 70 keV. Compared with DIRA, the worse performance of Monoenergetic Plus was caused by its (i) two-material decomposition to iodine and water and (ii) imperfect suppression of the beam hardening artifact in ADMIRE.
(© The Author(s) 2021. Published by Oxford University Press.)