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Article: A potential risk of overestimating apparent diffusion coefficient in parotid glands

TitleA potential risk of overestimating apparent diffusion coefficient in parotid glands
Authors
Issue Date2015
PublisherPublic Library of Science. The Journal's web site is located at http://www.plosone.org/home.action
Citation
PLoS One, 2015, v. 10 n. 4, p. Article no. e0124118 How to Cite?
AbstractObjectives: To investigate transient signal loss on diffusion weighted images (DWI) and overestimation of apparent diffusion coefficient (ADC) in parotid glands using single shot echoplanar DWI (EPDWI). Materials and Methods: This study enrolled 6 healthy subjects and 7 patients receiving radiotherapy. All participants received dynamic EPDWI with a total of 8 repetitions. Imaging quality of DWI was evaluated. Probability of severe overestimation of ADC (soADC), defined by an ADC ratio more than 1.2, was calculated. Error on T2WI, DWI, and ADC was computed. Statistical analysis included paired Student t testing and Mann-Whitney U test. A P value less than 0.05 was considered statistically significant. Results: Transient signal loss was visually detected on some excitations of DWI but not on T2WI or mean DWI. soADC occurred randomly among 8 excitations and 3 directions of diffusion encoding gradients. Probability of soADC was significantly higher in radiotherapy group (42.86%) than in healthy group (24.39%). The mean error percentage decreased as the number of excitations increased on all images, and, it was smallest on T2WI, followed by DWI and ADC in an increasing order. Conclusions: Transient signal loss on DWI was successfully detected by dynamic EPDWI. The signal loss on DWI and overestimation of ADC could be partially remedied by increasing the number of excitations. © 2015 Liu et al.
Persistent Identifierhttp://hdl.handle.net/10722/210066
ISSN
2015 Impact Factor: 3.057
2015 SCImago Journal Rankings: 1.395
PubMed Central ID

 

DC FieldValueLanguage
dc.contributor.authorLiu, YJ-
dc.contributor.authorLee, YH-
dc.contributor.authorChang, HCC-
dc.contributor.authorHuang, TY-
dc.contributor.authorChiu, HC-
dc.contributor.authorWang, CW-
dc.contributor.authorChiou, TW-
dc.contributor.authorHsu, K-
dc.contributor.authorJuan, CJ-
dc.contributor.authorHuang, GS-
dc.contributor.authorHsu, HH-
dc.date.accessioned2015-05-22T05:46:18Z-
dc.date.available2015-05-22T05:46:18Z-
dc.date.issued2015-
dc.identifier.citationPLoS One, 2015, v. 10 n. 4, p. Article no. e0124118-
dc.identifier.issn1932-6203-
dc.identifier.urihttp://hdl.handle.net/10722/210066-
dc.description.abstractObjectives: To investigate transient signal loss on diffusion weighted images (DWI) and overestimation of apparent diffusion coefficient (ADC) in parotid glands using single shot echoplanar DWI (EPDWI). Materials and Methods: This study enrolled 6 healthy subjects and 7 patients receiving radiotherapy. All participants received dynamic EPDWI with a total of 8 repetitions. Imaging quality of DWI was evaluated. Probability of severe overestimation of ADC (soADC), defined by an ADC ratio more than 1.2, was calculated. Error on T2WI, DWI, and ADC was computed. Statistical analysis included paired Student t testing and Mann-Whitney U test. A P value less than 0.05 was considered statistically significant. Results: Transient signal loss was visually detected on some excitations of DWI but not on T2WI or mean DWI. soADC occurred randomly among 8 excitations and 3 directions of diffusion encoding gradients. Probability of soADC was significantly higher in radiotherapy group (42.86%) than in healthy group (24.39%). The mean error percentage decreased as the number of excitations increased on all images, and, it was smallest on T2WI, followed by DWI and ADC in an increasing order. Conclusions: Transient signal loss on DWI was successfully detected by dynamic EPDWI. The signal loss on DWI and overestimation of ADC could be partially remedied by increasing the number of excitations. © 2015 Liu et al.-
dc.languageeng-
dc.publisherPublic Library of Science. The Journal's web site is located at http://www.plosone.org/home.action-
dc.relation.ispartofPLoS One-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleA potential risk of overestimating apparent diffusion coefficient in parotid glands-
dc.typeArticle-
dc.identifier.emailChang, HCC: hccchang@hku.hk-
dc.identifier.authorityChang, HCC=rp02024-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1371/journal.pone.0124118-
dc.identifier.pmid25922948-
dc.identifier.pmcid4414616-
dc.identifier.scopuseid_2-s2.0-84928753681-
dc.identifier.volume10-
dc.identifier.issue4-
dc.identifier.spageArticle no. e0124118-
dc.identifier.epageArticle no. e0124118-
dc.publisher.placeUnited States-

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