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Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms

BACKGROUND: To figure out the relationship between image noise and contrast noise ratio (CNR) at different tube voltages, using anthropomorphic new-born and 1-year-old phantoms, and to discuss the feasibility of radiation dose reduction, based on the obtained CNR index from image noise. We performed...

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Autores principales: Masuda, Takanori, Funama, Yoshinori, Kiguchi, Masao, Imada, Naoyuki, Oku, Takayuki, Sato, Tomoyasu, Awai, Kazuo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer International Publishing 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5133217/
https://www.ncbi.nlm.nih.gov/pubmed/27995041
http://dx.doi.org/10.1186/s40064-016-3715-y
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author Masuda, Takanori
Funama, Yoshinori
Kiguchi, Masao
Imada, Naoyuki
Oku, Takayuki
Sato, Tomoyasu
Awai, Kazuo
author_facet Masuda, Takanori
Funama, Yoshinori
Kiguchi, Masao
Imada, Naoyuki
Oku, Takayuki
Sato, Tomoyasu
Awai, Kazuo
author_sort Masuda, Takanori
collection PubMed
description BACKGROUND: To figure out the relationship between image noise and contrast noise ratio (CNR) at different tube voltages, using anthropomorphic new-born and 1-year-old phantoms, and to discuss the feasibility of radiation dose reduction, based on the obtained CNR index from image noise. We performed helical scans of the anthropomorphic new-born and 1-year-old phantoms. The CT numbers of the simulated aorta and image noise of the simulated mediastinum were measured; then CNR was calculated on 80, 100, and 120-kVp images reconstructed with filtered back projection (FBP) and iterative reconstruction (IR). We also measured the center and surface dose in the case of CNR of 14 using radio-photoluminescence glass dosimeters. RESULTS: The CT number of the simulated aorta was increased with decreasing tube voltage from 120 to 80 kVp (362.5–535.1 HU for the new-born, 358.9–532.6 HU for the 1-year-old). At CNR of 14, the center dose was 0.4, 0.6 and 0.9 mGy at FBP and 0.5, 0.6 and 0.9 mGy at IR and with the new-born phantom acquired at 80, 100 and 120 kVp, respectively. The center dose for FBP image was reduced by 56% at 80 kVp, 34% at 100 kVp for the new-born and 36% at 80 kVp, 22% at 100 kVp for the 1-year-old compared with that at 120 kVp. We obtained a relationship between image noise and CNR at different tube voltages using the anthropomorphic new-born and 1-year-old phantoms. CONCLUSION: The use of index of CNR with low-tube voltage may achieve further radiation dose reduction in pediatric CT examination.
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spelling pubmed-51332172016-12-19 Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms Masuda, Takanori Funama, Yoshinori Kiguchi, Masao Imada, Naoyuki Oku, Takayuki Sato, Tomoyasu Awai, Kazuo Springerplus Research BACKGROUND: To figure out the relationship between image noise and contrast noise ratio (CNR) at different tube voltages, using anthropomorphic new-born and 1-year-old phantoms, and to discuss the feasibility of radiation dose reduction, based on the obtained CNR index from image noise. We performed helical scans of the anthropomorphic new-born and 1-year-old phantoms. The CT numbers of the simulated aorta and image noise of the simulated mediastinum were measured; then CNR was calculated on 80, 100, and 120-kVp images reconstructed with filtered back projection (FBP) and iterative reconstruction (IR). We also measured the center and surface dose in the case of CNR of 14 using radio-photoluminescence glass dosimeters. RESULTS: The CT number of the simulated aorta was increased with decreasing tube voltage from 120 to 80 kVp (362.5–535.1 HU for the new-born, 358.9–532.6 HU for the 1-year-old). At CNR of 14, the center dose was 0.4, 0.6 and 0.9 mGy at FBP and 0.5, 0.6 and 0.9 mGy at IR and with the new-born phantom acquired at 80, 100 and 120 kVp, respectively. The center dose for FBP image was reduced by 56% at 80 kVp, 34% at 100 kVp for the new-born and 36% at 80 kVp, 22% at 100 kVp for the 1-year-old compared with that at 120 kVp. We obtained a relationship between image noise and CNR at different tube voltages using the anthropomorphic new-born and 1-year-old phantoms. CONCLUSION: The use of index of CNR with low-tube voltage may achieve further radiation dose reduction in pediatric CT examination. Springer International Publishing 2016-12-01 /pmc/articles/PMC5133217/ /pubmed/27995041 http://dx.doi.org/10.1186/s40064-016-3715-y Text en © The Author(s) 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Research
Masuda, Takanori
Funama, Yoshinori
Kiguchi, Masao
Imada, Naoyuki
Oku, Takayuki
Sato, Tomoyasu
Awai, Kazuo
Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms
title Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms
title_full Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms
title_fullStr Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms
title_full_unstemmed Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms
title_short Radiation dose reduction based on CNR index with low-tube voltage scan for pediatric CT scan: experimental study using anthropomorphic phantoms
title_sort radiation dose reduction based on cnr index with low-tube voltage scan for pediatric ct scan: experimental study using anthropomorphic phantoms
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5133217/
https://www.ncbi.nlm.nih.gov/pubmed/27995041
http://dx.doi.org/10.1186/s40064-016-3715-y
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