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J Radiat Res. 2017 Sep 1;58(5):755-760. doi: 10.1093/jrr/rrx036.

Development of a minipig physical phantom from CT data.

Author information

1
Laboratory of Health Physics, National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, 75 Nowon-gil, Nowon-gu 01812, Seoul, Republic of Korea.
2
Department of Nuclear Engineering, Hanyang University, 04763, 222 Wangsimni-ro, Seongdong-gu, Seoul, Republic of Korea.
3
Laboratory of Radiation Exposure & Therapeutics, National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, 75 Nowon-gil, Nowon-gu 01812, Seoul, Republic of Korea.
4
National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, 75 Nowon-gil, Nowon-gu 01812, Seoul, Republic of Korea.

Abstract

Quantification of pathological progression of radiation-induced injury is essential in development of treatment methods, and a proper animal model is necessary for relevant radiological and medical studies. A minipig is a current animal model selected because of its similarities to humans in anatomy and pathology. In the present study, a minipig physical phantom was developed using computed tomography (CT) data. For dosimetry purposes, the minipig physical phantom was constructed on a slice-by-slice basis, with an array of holes to accommodate dosimeters. The phantom is constituted of three major organs, i.e. bone, lung, and remaining soft tissue, and the organs are clearly distinguishable on each 20-mm-thick axial slice. The quality of the tissue-equivalent (TE) substitutes was analyzed in terms of the atomic compositions and Hounsfield units (HUs). The density (in g/cm3) and effective atomic number of TE substitutes for the bone, lung, and soft tissue are 1.4 and 7.9, 0.5 and 10.0, and 1.0 and 5.9, respectively. Although the TE substitutes have slightly different physical properties, we think the phantom is acceptable because the HU values of the TE substitutes lie in the HU range of real tissues.

KEYWORDS:

minipig; minipig physical phantom; physical phantom; radiation dosimetry; tissue-equivalent material

PMID:
28992232
PMCID:
PMC5737602
DOI:
10.1093/jrr/rrx036
[Indexed for MEDLINE]
Free PMC Article

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