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Assessment of the ability of CT urography with low-dose multi-phasic excretory phases for opacification of the urinary system

OBJECTIVE: To prospectively evaluate the ability of CT urography with a low-dose multi-phasic excretory phase for opacification of the urinary system. MATERIALS AND METHODS: Thirty-two patients underwent CT urography with low-dose multi-phasic s using adaptive iterative dose reduction 3D acquired at...

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Autores principales: Juri, Hiroshi, Tsuboyama, Takahiro, Koyama, Mitsuhiro, Yamamoto, Kiyohito, Nakai, Go, Nakamoto, Atsushi, Yamamoto, Kazuhiro, Azuma, Haruhito, Narumi, Yoshifumi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5383231/
https://www.ncbi.nlm.nih.gov/pubmed/28384174
http://dx.doi.org/10.1371/journal.pone.0174800
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author Juri, Hiroshi
Tsuboyama, Takahiro
Koyama, Mitsuhiro
Yamamoto, Kiyohito
Nakai, Go
Nakamoto, Atsushi
Yamamoto, Kazuhiro
Azuma, Haruhito
Narumi, Yoshifumi
author_facet Juri, Hiroshi
Tsuboyama, Takahiro
Koyama, Mitsuhiro
Yamamoto, Kiyohito
Nakai, Go
Nakamoto, Atsushi
Yamamoto, Kazuhiro
Azuma, Haruhito
Narumi, Yoshifumi
author_sort Juri, Hiroshi
collection PubMed
description OBJECTIVE: To prospectively evaluate the ability of CT urography with a low-dose multi-phasic excretory phase for opacification of the urinary system. MATERIALS AND METHODS: Thirty-two patients underwent CT urography with low-dose multi-phasic s using adaptive iterative dose reduction 3D acquired at 5-, 10-, and 15-minute delays. Opacification scores of the upper urinary tracts and the urinary bladder were assigned for each excretory phase by two radiologists, who recorded whether adequate (>75%) or complete (100%) opacification of the upper urinary tract and urinary bladder was achieved in each patient. Adequate and complete opacification rates of the upper urinary tracts and the urinary bladder were compared among three excretory phases and among combined multi-phasic excretory phases using Cochran's Q test. RESULTS: There was no significant difference among three excretory phases with 5-, 10-, and 15-minute delays in adequate (56.3, 43.8, and 63.5%, respectively; P = 0.174) and complete opacification rates (9.3, 15.6, and 18.7%, respectively; P = 0.417) of the upper urinary tracts. Combined tri-phasic excretory phases significantly improved adequate and complete opacification rates to 84.4% and 43.8%, respectively (P = 0.002). In contrast, there were significant differences among three excretory phases for the rate of adequate (31.3, 84.4, and 93.8%, respectively; P<0.001) and complete opacification (21.9, 53.1, and 81.3%, respectively; P<0.001) of the urinary bladder. Multi-phasic excretory phases did not improve these rates because opacification was always better with a longer delay. CONCLUSION: Although multi-phasic acquisition of excretory phases is effective at improving opacification of the upper urinary tracts, complete opacification is difficult even with tri-phasic acquisition.
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spelling pubmed-53832312017-05-03 Assessment of the ability of CT urography with low-dose multi-phasic excretory phases for opacification of the urinary system Juri, Hiroshi Tsuboyama, Takahiro Koyama, Mitsuhiro Yamamoto, Kiyohito Nakai, Go Nakamoto, Atsushi Yamamoto, Kazuhiro Azuma, Haruhito Narumi, Yoshifumi PLoS One Research Article OBJECTIVE: To prospectively evaluate the ability of CT urography with a low-dose multi-phasic excretory phase for opacification of the urinary system. MATERIALS AND METHODS: Thirty-two patients underwent CT urography with low-dose multi-phasic s using adaptive iterative dose reduction 3D acquired at 5-, 10-, and 15-minute delays. Opacification scores of the upper urinary tracts and the urinary bladder were assigned for each excretory phase by two radiologists, who recorded whether adequate (>75%) or complete (100%) opacification of the upper urinary tract and urinary bladder was achieved in each patient. Adequate and complete opacification rates of the upper urinary tracts and the urinary bladder were compared among three excretory phases and among combined multi-phasic excretory phases using Cochran's Q test. RESULTS: There was no significant difference among three excretory phases with 5-, 10-, and 15-minute delays in adequate (56.3, 43.8, and 63.5%, respectively; P = 0.174) and complete opacification rates (9.3, 15.6, and 18.7%, respectively; P = 0.417) of the upper urinary tracts. Combined tri-phasic excretory phases significantly improved adequate and complete opacification rates to 84.4% and 43.8%, respectively (P = 0.002). In contrast, there were significant differences among three excretory phases for the rate of adequate (31.3, 84.4, and 93.8%, respectively; P<0.001) and complete opacification (21.9, 53.1, and 81.3%, respectively; P<0.001) of the urinary bladder. Multi-phasic excretory phases did not improve these rates because opacification was always better with a longer delay. CONCLUSION: Although multi-phasic acquisition of excretory phases is effective at improving opacification of the upper urinary tracts, complete opacification is difficult even with tri-phasic acquisition. Public Library of Science 2017-04-06 /pmc/articles/PMC5383231/ /pubmed/28384174 http://dx.doi.org/10.1371/journal.pone.0174800 Text en © 2017 Juri et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Juri, Hiroshi
Tsuboyama, Takahiro
Koyama, Mitsuhiro
Yamamoto, Kiyohito
Nakai, Go
Nakamoto, Atsushi
Yamamoto, Kazuhiro
Azuma, Haruhito
Narumi, Yoshifumi
Assessment of the ability of CT urography with low-dose multi-phasic excretory phases for opacification of the urinary system
title Assessment of the ability of CT urography with low-dose multi-phasic excretory phases for opacification of the urinary system
title_full Assessment of the ability of CT urography with low-dose multi-phasic excretory phases for opacification of the urinary system
title_fullStr Assessment of the ability of CT urography with low-dose multi-phasic excretory phases for opacification of the urinary system
title_full_unstemmed Assessment of the ability of CT urography with low-dose multi-phasic excretory phases for opacification of the urinary system
title_short Assessment of the ability of CT urography with low-dose multi-phasic excretory phases for opacification of the urinary system
title_sort assessment of the ability of ct urography with low-dose multi-phasic excretory phases for opacification of the urinary system
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5383231/
https://www.ncbi.nlm.nih.gov/pubmed/28384174
http://dx.doi.org/10.1371/journal.pone.0174800
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