Evaluation of direct point dose estimation based on the distribution of the size-specific dose estimate.

Autor: Anam C; Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Central Java, Jl. Prof Soedarto, SH Tembalang, Tembalang, Semarang, 50275, Indonesia. anam@fisika.fsm.undip.ac.id., Sutanto H; Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Central Java, Jl. Prof Soedarto, SH Tembalang, Tembalang, Semarang, 50275, Indonesia., Amilia R; Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Central Java, Jl. Prof Soedarto, SH Tembalang, Tembalang, Semarang, 50275, Indonesia., Marini R; Regional Public Hospital of Karawang, Jl. Galuh Mas Raya No.1, Sukaharja, Telukjambe Timur, Kabupaten Karawang 41361, West Java, Indonesia., Barokah SN; Laboratorium Kalibrasi Alat Ukur Radiasi, Natial Research and Innovation Agency, Jakarta, Indonesia., Osman ND; Advanced Medical and Dental Institute, Universiti Sains Malaysia, 13200 Kepala Batas, Penang, Malaysia., Dougherty G; Department of Applied Physics and Medical Imaging, California State University Channel Islands, Camarillo, CA, 93012, USA.
Jazyk: angličtina
Zdroj: Physical and engineering sciences in medicine [Phys Eng Sci Med] 2024 Dec; Vol. 47 (4), pp. 1525-1535. Date of Electronic Publication: 2024 Jul 31.
DOI: 10.1007/s13246-024-01465-2
Abstrakt: The aim of this study was to evaluate the point doses using a distribution of the size-specific dose estimate (SSDE) from axial CT images of in-house phantoms having diameters from 8 to 40 cm. In-house phantoms made of polyester-resin (PESR) mixed with methyl ethyl ketone peroxide (MEKP) were used. The phantoms were built with different diameter sizes of 8, 16, 24, 32, and 40 cm. The phantoms were scanned by Siemens a SOMATOM Perspective-128 slice CT scanner with constant input parameters. The point doses were interpolated from the central SSDE (SSDEc) and the peripheral SSDE (SSDEp). The SSDEc and SSDEp were calculated from the SSDE with h- and k-factors. The point doses were compared to the direct measurements using the nanoDot™ optically-stimulated luminescence dosimeter (OSLD) in dedicated holes on the phantoms. It was found that the point dose decreases as the phantom diameter increased. The doses obtained using two approaches differed by 11% on average. The highest difference was 40% and the lowest difference was < 1%. It was found that dose based on the SSDE concept tended to be higher compared to the measured dose by OSLD. Point dose estimation using the concept of SSDE distribution can be considered an alternative for accurate and simple estimation. This approach still requires improvements to increase its accuracy and its application to estimate the organ dose needs further investigation.
Competing Interests: Declarations. Conflict of interest: Choirul Anam and Geoff Dougherty are developers of IndoseCT. Other authors declare that they have no conflict of interest. Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.
(© 2024. Australasian College of Physical Scientists and Engineers in Medicine.)
Databáze: MEDLINE
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