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Titolo:
In vitro investigation of prosthetic heart valves in magnetic resonance imaging: Evaluation of potential hazards
Autore:
Pruefer, D; Kalden, P; Schreiber, W; Dahm, M; Buerke, M; Thelen, M; Oelert, H;
Indirizzi:
Univ Mainz, Dept Cardiothorac & Vasc Surg, D-55101 Mainz, Germany Univ Mainz Mainz Germany D-55101 rac & Vasc Surg, D-55101 Mainz, Germany Univ Mainz, Dept Radiol, D-55101 Mainz, Germany Univ Mainz Mainz GermanyD-55101 nz, Dept Radiol, D-55101 Mainz, Germany Univ Mainz, Dept Med Cardiol 2, D-55101 Mainz, Germany Univ Mainz Mainz Germany D-55101 t Med Cardiol 2, D-55101 Mainz, Germany
Titolo Testata:
JOURNAL OF HEART VALVE DISEASE
fascicolo: 3, volume: 10, anno: 2001,
pagine: 410 - 414
SICI:
0966-8519(200105)10:3<410:IVIOPH>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
EX-VIVO EVALUATION; 1.5-T MR SYSTEM; METALLIC IMPLANTS; ARTIFACTS; SAFETY; FERROMAGNETISM; DEVICES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Pruefer, D Univ Mainz, Dept Cardiothorac & Vasc Surg, Langenbeck Str 1, D-55101 Mainz, Germany Univ Mainz Langenbeck Str 1 Mainz Germany D-55101 inz, Germany
Citazione:
D. Pruefer et al., "In vitro investigation of prosthetic heart valves in magnetic resonance imaging: Evaluation of potential hazards", J HEART V D, 10(3), 2001, pp. 410-414

Abstract

Background and aim of the study: Magnetic resonance (MR) imaging is used in an increasing number of patients, and not only after cardiac valve replacement. However, ferromagnetic biomedical implants are often considered a contraindication for MR imaging because of the potential hazards with respectto their movement, dislodgement, or heating effects during the procedure. The purpose of this study was to assess ferromagnetism, attraction forces, heating effects, and artifacts associated with prosthetic heart valve implants. Methods: Seventeen common heart valve prostheses (12 mechanical, five biological) were examined in vitro using a high-field-strength 1.5 Tesla (T) MRsystem. Attractive forces, temperature changes and the amount of artifactswere assessed by applying turbo-spin and gradient-echo sequences. Results: The maximal calculated corresponding ferromagnetic force was (0.22 x 10(-3) N) in the static magnetic field. The temperature changes ranged from 0 to 0.5 degreesC maximum. Artifacts produced by the presence of the heart valve prostheses were less evident using a spin-echo sequence than a gradient-echo sequence. Conclusion: MR imaging exerted no significant force on the examined heart valve prostheses, and did not result in significant biological relevant temperature increase. None of the associated artifacts is considered to pose asubstantial risk on MR imaging. MR procedures performed with a 1.5 T MR system can be applied safely in patients with heart valve prostheses evaluated in this study.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/01/20 alle ore 15:55:22