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

Anam C 1 , Sutanto H 2 , Amilia R 2 , Marini R 3 , Barokah SN 4 , Osman ND 5 Show all authors , Dougherty G 6

Affiliations 

  • 1 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
  • 2 Department of Physics, Faculty of Sciences and Mathematics, Diponegoro University, Central Java, Jl. Prof Soedarto, SH Tembalang, Tembalang, Semarang, 50275, Indonesia
  • 3 Regional Public Hospital of Karawang, Jl. Galuh Mas Raya No.1, Sukaharja, Telukjambe Timur, Kabupaten Karawang 41361, West Java, Indonesia
  • 4 Laboratorium Kalibrasi Alat Ukur Radiasi, Natial Research and Innovation Agency, Jakarta, Indonesia
  • 5 Advanced Medical and Dental Institute, Universiti Sains Malaysia, 13200 Kepala Batas, Penang, Malaysia
  • 6 Department of Applied Physics and Medical Imaging, California State University Channel Islands, Camarillo, CA, 93012, USA
Phys Eng Sci Med, 2024 Jul 31.
PMID: 39083162 DOI: 10.1007/s13246-024-01465-2

Abstract

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

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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