Elimination of errors caused by first-order aliasing in velocity encoded cine-MR measurements of postoperative jets after aortic coarctation: in vitro and in vivo validation.
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| Title: | Elimination of errors caused by first-order aliasing in velocity encoded cine-MR measurements of postoperative jets after aortic coarctation: in vitro and in vivo validation. |
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| Authors: | Henk, Christine B.1 Christine.Henk@univie.ac.at, Grampp, Stephan1, Koller, Jeanette2, Schoder, Maria1, Frank, Herbert2, Klaar, Ursula2, Gomischek, Gregor1, Mostbeck, Gerhard H.3 |
| Source: | European Radiology. Jun2002, Vol. 12 Issue 6, p1523-1531. 9p. |
| Subjects: | Aortic coarctation, Aorta abnormalities, Imaging phantoms, Radiology, Doppler echocardiography, Medical imaging systems, Magnetic resonance imaging, Hemodynamics, Blood flow measurement, Postoperative period, Echocardiography |
| Abstract: | The aim of this study was to evaluate a velocity-encoded cine-MR (VEC-MR) sequence in measuring flow velocities up to two times the velocity encoding value (VENC) in a flow phantom and to validate the method for assessing poststenotic jet velocities in postoperative patients after aortic coarctation. In vitro, a flow phantom was used (0.5T; TR/TE: 51/8 ms, flip angle=30 degrees, FOV=280 mm, 128x256 matrix VENC 40 or 80 cm/s). On binary images, maximum flow velocities (V(max)) were calculated with a region of interest (ROI, 8 pixels). With aliasing, V(max) was calculated by VENC+(V(aliasing)). In vivo, 16 postoperative patients after aortic coarctation underwent double-oblique VEC-MR imaging through the aortic arch (ECG triggering, 16 phases/RR, TR=600-800 ms, flow-encoding cranio-caudal, VENC=2 m/s). Peak systolic velocities were measured and transthoracic Doppler echocardiography (TTDE) was performed. In vitro, there were excellent correlations for MR velocity measurements with and without aliasing ( r=0.99) and for true and MR-derived flow velocities ( r=0.99). In vivo, there was good correlation between VEC-MR and TTDE-assessed V(max) values in the aorta at the former coarctation site ( r=0.90, n=16). Aliasing occurred in 13 patients. VEC-MR is a useful modality for assessing jet velocities in the follow-up of patients after aortic coarctation. Despite of aliasing, accurate velocity measurements up to two times VENC are possible using binary images. [ABSTRACT FROM AUTHOR] |
| Copyright of European Radiology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Items | – Name: Title Label: Title Group: Ti Data: Elimination of errors caused by first-order aliasing in velocity encoded cine-MR measurements of postoperative jets after aortic coarctation: in vitro and in vivo validation. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Henk%2C+Christine+B%2E%22">Henk, Christine B.</searchLink><relatesTo>1</relatesTo><i> Christine.Henk@univie.ac.at</i><br /><searchLink fieldCode="AR" term="%22Grampp%2C+Stephan%22">Grampp, Stephan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Koller%2C+Jeanette%22">Koller, Jeanette</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Schoder%2C+Maria%22">Schoder, Maria</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Frank%2C+Herbert%22">Frank, Herbert</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Klaar%2C+Ursula%22">Klaar, Ursula</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Gomischek%2C+Gregor%22">Gomischek, Gregor</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mostbeck%2C+Gerhard+H%2E%22">Mostbeck, Gerhard H.</searchLink><relatesTo>3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22European+Radiology%22">European Radiology</searchLink>. Jun2002, Vol. 12 Issue 6, p1523-1531. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Aortic+coarctation%22">Aortic coarctation</searchLink><br /><searchLink fieldCode="DE" term="%22Aorta+abnormalities%22">Aorta abnormalities</searchLink><br /><searchLink fieldCode="DE" term="%22Imaging+phantoms%22">Imaging phantoms</searchLink><br /><searchLink fieldCode="DE" term="%22Radiology%22">Radiology</searchLink><br /><searchLink fieldCode="DE" term="%22Doppler+echocardiography%22">Doppler echocardiography</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+imaging+systems%22">Medical imaging systems</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+resonance+imaging%22">Magnetic resonance imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Hemodynamics%22">Hemodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Blood+flow+measurement%22">Blood flow measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Postoperative+period%22">Postoperative period</searchLink><br /><searchLink fieldCode="DE" term="%22Echocardiography%22">Echocardiography</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The aim of this study was to evaluate a velocity-encoded cine-MR (VEC-MR) sequence in measuring flow velocities up to two times the velocity encoding value (VENC) in a flow phantom and to validate the method for assessing poststenotic jet velocities in postoperative patients after aortic coarctation. In vitro, a flow phantom was used (0.5T; TR/TE: 51/8 ms, flip angle=30 degrees, FOV=280 mm, 128x256 matrix VENC 40 or 80 cm/s). On binary images, maximum flow velocities (V(max)) were calculated with a region of interest (ROI, 8 pixels). With aliasing, V(max) was calculated by VENC+(V(aliasing)). In vivo, 16 postoperative patients after aortic coarctation underwent double-oblique VEC-MR imaging through the aortic arch (ECG triggering, 16 phases/RR, TR=600-800 ms, flow-encoding cranio-caudal, VENC=2 m/s). Peak systolic velocities were measured and transthoracic Doppler echocardiography (TTDE) was performed. In vitro, there were excellent correlations for MR velocity measurements with and without aliasing ( r=0.99) and for true and MR-derived flow velocities ( r=0.99). In vivo, there was good correlation between VEC-MR and TTDE-assessed V(max) values in the aorta at the former coarctation site ( r=0.90, n=16). Aliasing occurred in 13 patients. VEC-MR is a useful modality for assessing jet velocities in the follow-up of patients after aortic coarctation. Despite of aliasing, accurate velocity measurements up to two times VENC are possible using binary images. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of European Radiology is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00330-001-1176-2 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 1523 Subjects: – SubjectFull: Aortic coarctation Type: general – SubjectFull: Aorta abnormalities Type: general – SubjectFull: Imaging phantoms Type: general – SubjectFull: Radiology Type: general – SubjectFull: Doppler echocardiography Type: general – SubjectFull: Medical imaging systems Type: general – SubjectFull: Magnetic resonance imaging Type: general – SubjectFull: Hemodynamics Type: general – SubjectFull: Blood flow measurement Type: general – SubjectFull: Postoperative period Type: general – SubjectFull: Echocardiography Type: general Titles: – TitleFull: Elimination of errors caused by first-order aliasing in velocity encoded cine-MR measurements of postoperative jets after aortic coarctation: in vitro and in vivo validation. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Henk, Christine B. – PersonEntity: Name: NameFull: Grampp, Stephan – PersonEntity: Name: NameFull: Koller, Jeanette – PersonEntity: Name: NameFull: Schoder, Maria – PersonEntity: Name: NameFull: Frank, Herbert – PersonEntity: Name: NameFull: Klaar, Ursula – PersonEntity: Name: NameFull: Gomischek, Gregor – PersonEntity: Name: NameFull: Mostbeck, Gerhard H. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2002 Type: published Y: 2002 Identifiers: – Type: issn-print Value: 09387994 Numbering: – Type: volume Value: 12 – Type: issue Value: 6 Titles: – TitleFull: European Radiology Type: main |
| ResultId | 1 |
