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Title: Development of the two Korean adult tomographic computational phantoms for organ dosimetry

Abstract

Following the previously developed Korean tomographic phantom, KORMAN, two additional whole-body tomographic phantoms of Korean adult males were developed from magnetic resonance (MR) and computed tomography (CT) images, respectively. Two healthy male volunteers, whose body dimensions were fairly representative of the average Korean adult male, were recruited and scanned for phantom development. Contiguous whole body MR images were obtained from one subject exclusive of the arms, while whole-body CT images were acquired from the second individual. A total of 29 organs and tissues and 19 skeletal sites were segmented via image manipulation techniques such as gray-level thresholding, region growing, and manual drawing, in which each of segmented image slice was subsequently reviewed by an experienced radiologist for anatomical accuracy. The resulting phantoms, the MR-based KTMAN-1 (Korean Typical MAN-1) and the CT-based KTMAN-2 (Korean Typical MAN-2), consist of 300x150x344 voxels with a voxel resolution of 2x2x5 mm{sup 3} for both phantoms. Masses of segmented organs and tissues were calculated as the product of a nominal reference density, the prevoxel volume, and the cumulative number of voxels defining each organs or tissue. These organs masses were then compared with those of both the Asian and the ICRP reference adult male. Organ massesmore » within both KTMAN-1 and KTMAN-2 showed differences within 40% of Asian and ICRP reference values, with the exception of the skin, gall bladder, and pancreas which displayed larger differences. The resulting three-dimensional binary file was ported to the Monte Carlo code MCNPX2.4 to calculate organ doses following external irradiation for illustrative purposes. Colon, lung, liver, and stomach absorbed doses, as well as the effective dose, for idealized photon irradiation geometries (anterior-posterior and right lateral) were determined, and then compared with data from two other tomographic phantoms (Asian and Caucasian), and stylized ORNL phantom. The armless KTMAN-1 can be applied to dosimetry for computed tomography or lateral x-ray examination, while the whole body KTMAN-2 can be used for radiation protection dosimetry.« less

Authors:
; ; ;  [1]
  1. Department of Nuclear and Radiological Engineering, University of Florida, NSC 202, Gainesville, Florida 32606 (United States)
Publication Date:
OSTI Identifier:
20775063
Resource Type:
Journal Article
Journal Name:
Medical Physics
Additional Journal Information:
Journal Volume: 33; Journal Issue: 2; Other Information: DOI: 10.1118/1.2161405; (c) 2006 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-2405
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; BLADDER; COMPUTERIZED TOMOGRAPHY; DOSIMETRY; EXTERNAL IRRADIATION; ICRP; IMAGES; LARGE INTESTINE; LIVER; LUNGS; MONTE CARLO METHOD; NMR IMAGING; PANCREAS; PHANTOMS; RADIATION DOSES; SKIN; STOMACH

Citation Formats

Lee, Choonsik, Lee, Choonik, Park, Sang-Hyun, Lee, Jai-Ki, and Department of Nuclear Engineering, Hanyang University, 17 Haengdang, Sungdong, Seoul, 133-791. Development of the two Korean adult tomographic computational phantoms for organ dosimetry. United States: N. p., 2006. Web. doi:10.1118/1.2161405.
Lee, Choonsik, Lee, Choonik, Park, Sang-Hyun, Lee, Jai-Ki, & Department of Nuclear Engineering, Hanyang University, 17 Haengdang, Sungdong, Seoul, 133-791. Development of the two Korean adult tomographic computational phantoms for organ dosimetry. United States. doi:10.1118/1.2161405.
Lee, Choonsik, Lee, Choonik, Park, Sang-Hyun, Lee, Jai-Ki, and Department of Nuclear Engineering, Hanyang University, 17 Haengdang, Sungdong, Seoul, 133-791. Wed . "Development of the two Korean adult tomographic computational phantoms for organ dosimetry". United States. doi:10.1118/1.2161405.
@article{osti_20775063,
title = {Development of the two Korean adult tomographic computational phantoms for organ dosimetry},
author = {Lee, Choonsik and Lee, Choonik and Park, Sang-Hyun and Lee, Jai-Ki and Department of Nuclear Engineering, Hanyang University, 17 Haengdang, Sungdong, Seoul, 133-791},
abstractNote = {Following the previously developed Korean tomographic phantom, KORMAN, two additional whole-body tomographic phantoms of Korean adult males were developed from magnetic resonance (MR) and computed tomography (CT) images, respectively. Two healthy male volunteers, whose body dimensions were fairly representative of the average Korean adult male, were recruited and scanned for phantom development. Contiguous whole body MR images were obtained from one subject exclusive of the arms, while whole-body CT images were acquired from the second individual. A total of 29 organs and tissues and 19 skeletal sites were segmented via image manipulation techniques such as gray-level thresholding, region growing, and manual drawing, in which each of segmented image slice was subsequently reviewed by an experienced radiologist for anatomical accuracy. The resulting phantoms, the MR-based KTMAN-1 (Korean Typical MAN-1) and the CT-based KTMAN-2 (Korean Typical MAN-2), consist of 300x150x344 voxels with a voxel resolution of 2x2x5 mm{sup 3} for both phantoms. Masses of segmented organs and tissues were calculated as the product of a nominal reference density, the prevoxel volume, and the cumulative number of voxels defining each organs or tissue. These organs masses were then compared with those of both the Asian and the ICRP reference adult male. Organ masses within both KTMAN-1 and KTMAN-2 showed differences within 40% of Asian and ICRP reference values, with the exception of the skin, gall bladder, and pancreas which displayed larger differences. The resulting three-dimensional binary file was ported to the Monte Carlo code MCNPX2.4 to calculate organ doses following external irradiation for illustrative purposes. Colon, lung, liver, and stomach absorbed doses, as well as the effective dose, for idealized photon irradiation geometries (anterior-posterior and right lateral) were determined, and then compared with data from two other tomographic phantoms (Asian and Caucasian), and stylized ORNL phantom. The armless KTMAN-1 can be applied to dosimetry for computed tomography or lateral x-ray examination, while the whole body KTMAN-2 can be used for radiation protection dosimetry.},
doi = {10.1118/1.2161405},
journal = {Medical Physics},
issn = {0094-2405},
number = 2,
volume = 33,
place = {United States},
year = {2006},
month = {2}
}