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Article: The effect of using shorter echo times in MR imaging of knee menisci: a study using a procine model

TitleThe effect of using shorter echo times in MR imaging of knee menisci: a study using a procine model
Authors
Issue Date1999
PublisherAmerican Roentgen Ray Society. The Journal's web site is located at http://www.arrs.org/scriptcontent/ajr/index.cfm
Citation
American Journal of Roentgenology, 1999, v. 172 n. 2, p. 485-488 How to Cite?
AbstractOBJECTIVE: Increasingly shorter TEs are being used for T1-weighted and proton density-weighted sequences in MR imaging of the knee. This study aims to evaluate the effect of a short TE on meniscal signal intensity. MATERIALS AND METHODS: Thirty porcine knees were imaged with a 1.5-T MR scanner using spin-echo T1-weighted and proton density-weighted sequences. TR was kept constant at 700 msec for T1-weighted and 2200 msec for proton density-weighted sequences. For each set of sequences, sagittal images were obtained using these TE values: 9, 12, 16, 20, and 25 msec. Imaging parameters, such as slice thickness and interslice gap, number of excitations, matrix size, and field of view, were identical for each set of sequences. Using a fixed window level and width, we assessed the anterior and posterior horns of the medial meniscus for signal hyperintensity at each TE value. Signal intensity was also measured in eight knees. The menisci were then dissected and examined grossly and histopathologically. RESULTS: Intrameniscal signal intensity increased progressively with shorter TEs. At a TE of 9 msec, signal hyperintensity was present in 100% of T1-weighted and 96.7% of proton density-weighted images. At a TE of 12 msec, signal hyperintensity was seen in 86.7% of T1-weighted and 80% of proton density-weighted images. At a TE of 16 msec, increased signal intensity was seen in only 3.3% of T1-weighted and 6.6% of proton density-weighted images. At TEs of 20 and 25 msec, increased signal intensity was seen in none of the T1-weighted and proton density-weighted images. Meniscal signal intensity increased exponentially at very short TE values. All menisci were found to be normal on gross and histopathological examination. CONCLUSION: Spurious signal hyperintensity appears in normal menisci at short TE values. Images acquired with short TEs should be interpreted with caution, and a TE of 16 msec or more is recommended.
Persistent Identifierhttp://hdl.handle.net/10722/49022
ISSN
2015 Impact Factor: 2.66
2015 SCImago Journal Rankings: 1.439
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorPeh, WCGen_HK
dc.contributor.authorChan, JHMen_HK
dc.contributor.authorShek, TWHen_HK
dc.contributor.authorWong, JWKen_HK
dc.date.accessioned2008-06-12T06:32:28Z-
dc.date.available2008-06-12T06:32:28Z-
dc.date.issued1999en_HK
dc.identifier.citationAmerican Journal of Roentgenology, 1999, v. 172 n. 2, p. 485-488en_HK
dc.identifier.issn0361-803Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/49022-
dc.description.abstractOBJECTIVE: Increasingly shorter TEs are being used for T1-weighted and proton density-weighted sequences in MR imaging of the knee. This study aims to evaluate the effect of a short TE on meniscal signal intensity. MATERIALS AND METHODS: Thirty porcine knees were imaged with a 1.5-T MR scanner using spin-echo T1-weighted and proton density-weighted sequences. TR was kept constant at 700 msec for T1-weighted and 2200 msec for proton density-weighted sequences. For each set of sequences, sagittal images were obtained using these TE values: 9, 12, 16, 20, and 25 msec. Imaging parameters, such as slice thickness and interslice gap, number of excitations, matrix size, and field of view, were identical for each set of sequences. Using a fixed window level and width, we assessed the anterior and posterior horns of the medial meniscus for signal hyperintensity at each TE value. Signal intensity was also measured in eight knees. The menisci were then dissected and examined grossly and histopathologically. RESULTS: Intrameniscal signal intensity increased progressively with shorter TEs. At a TE of 9 msec, signal hyperintensity was present in 100% of T1-weighted and 96.7% of proton density-weighted images. At a TE of 12 msec, signal hyperintensity was seen in 86.7% of T1-weighted and 80% of proton density-weighted images. At a TE of 16 msec, increased signal intensity was seen in only 3.3% of T1-weighted and 6.6% of proton density-weighted images. At TEs of 20 and 25 msec, increased signal intensity was seen in none of the T1-weighted and proton density-weighted images. Meniscal signal intensity increased exponentially at very short TE values. All menisci were found to be normal on gross and histopathological examination. CONCLUSION: Spurious signal hyperintensity appears in normal menisci at short TE values. Images acquired with short TEs should be interpreted with caution, and a TE of 16 msec or more is recommended.en_HK
dc.format.extent418 bytes-
dc.format.mimetypetext/html-
dc.languageengen_HK
dc.publisherAmerican Roentgen Ray Society. The Journal's web site is located at http://www.arrs.org/scriptcontent/ajr/index.cfmen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subject.meshKnee Joint - anatomy & histologyen_HK
dc.subject.meshMagnetic Resonance Imaging - methodsen_HK
dc.subject.meshMenisci, Tibial - anatomy & histologyen_HK
dc.subject.meshAnimalsen_HK
dc.subject.meshHindlimben_HK
dc.titleThe effect of using shorter echo times in MR imaging of knee menisci: a study using a procine modelen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0361-803X&volume=172&issue=2&spage=485&epage=488&date=1999&atitle=The+effect+of+using+shorter+echo+times+in+MR+imaging+of+knee+menisci:+a+study+using+a+procine+modelen_HK
dc.identifier.emailPeh, WCG: wcgpeh@hkucc.hku.hken_HK
dc.identifier.emailShek, TWH: whshek@hkucc.hku.hken_HK
dc.identifier.emailWong, JWK: jwkwong@HKUCC.hku.hken_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.pmid9930808en_HK
dc.identifier.hkuros39443-
dc.identifier.isiWOS:000078197900041-

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