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ACCURACY OF CT NUMBERS OBTAINED BY DIRA AND MONOENERGETIC PLUS ALGORITHMS IN DUAL-ENERGY COMPUTED TOMOGRAPHY
- Source :
- Radiation Protection Dosimetry
- Publication Year :
- 2021
- Publisher :
- Oxford University Press, 2021.
-
Abstract
- 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]
- Subjects :
- 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
Subjects
Details
- Language :
- English
- ISSN :
- 17423406 and 01448420
- Volume :
- 195
- Issue :
- 3-4
- Database :
- OpenAIRE
- Journal :
- Radiation Protection Dosimetry
- Accession number :
- edsair.doi.dedup.....b667ca86548dfce17cc34c1c09503e03