ACCURACY OF CT NUMBERS OBTAINED BY DIRA AND MONOENERGETIC PLUS ALGORITHMS IN DUAL-ENERGY COMPUTED TOMOGRAPHY
| Autor: | Michael Sandborg, Alexandr Malusek, Lilian Henriksson, Åsa Carlsson Tedgren, Maria Magnusson, Gudrun Alm Carlsson |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Paper Scanner Radiation AcademicSubjects/SCI00180 Radiological and Ultrasound Technology Phantoms Imaging Attenuation Public Health Environmental and Occupational Health Dual-Energy Computed Tomography General Medicine Radiotherapy treatment planning Imaging phantom Radiography Dual-Energy Scanned Projection Hounsfield scale Absorbed dose Beam Hardening Artifact Radiology Nuclear Medicine and imaging Radiologi och bildbehandling Tomography X-Ray Computed Algorithm Algorithms Radiology Nuclear Medicine and Medical Imaging Iodine |
| Zdroj: | Radiation Protection Dosimetry |
| ISSN: | 1742-3406 0144-8420 |
| Popis: | 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. Funding: CancerfondenSwedish Cancer Society [CAN 2017/1029, CAN 2018/622]; Swedish state government [LiO-602731]; Swedish county councils, the ALF-agreement [LiO-602731]; Patientsakerhetsforskning Region Ostergotland [LiO-724181]; VetenskapsradetSwedish Research Council [VR-NT 2016-05033] |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|