| Zugriffsnummer | 23237 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Influence of strong static magnetic fields on myocardial mechanics: evaluation applying ultra-wideband radar |
| Autor(in); Institution |
Thiel, Florian; 8.1, Medizinische Messtechnik, PTB-Berlin
Hein, M.; TU Ilmenau, GERMANY
Sachs, J.; TU Ilmenau, GERMANY
Schwarz, U.; TU Ilmenau, GERMANY
Lindel, Tomasz; 8.1, Medizinische Messtechnik, PTB-Berlin
Seifert, Frank; 8.1, Medizinische Messtechnik, PTB-Berlin
|
| Quelle/Jahr | Proceedings of the International Society for Magnetic Resonance in Medicine: 17 (2009), 298 |
| Availability | [CD-ROM] ; file name: 00298.pdf |
| ISSN | 1545-4428 |
| Konferenzangaben | ISMRM 17th Scientific Meeting, Honolulu, Hawaii, 18-24, April, 2009, USA |
| Freie Schlagworte | High- and ultra-high field MRI ; strong static magnetic fields ; myocardial mechanics ; UWB-Radar, microwave materials ; tissue phantoms ; dielectric properties of biological material ; motion detection |
| Zusammenfassung | ECG is excessively used for triggering MR data acquisition to image the heart in a certain stage of contraction or to prevent reduction of image quality by motion artifacts generated by the strong non-linear motion of the heart muscle. It is well established that the ECG is corrupted by the magneto-hydrodynamic effect (MHD). Hence, there is increasing difficulty to use the ECG for MR-triggering especially at B0-fields beyond 1.5 T. If the conducting particles of the blood are redirected by the magnetic field, it is only consequent to ask whether the electrical excitation spread over the myocardial muscle, which is based on ionic transportation, is redirected, too. Such an redirection should be visible in the ECG and in an deviant myocardial contraction which is directly dependent on the spatio-temporal devolution of the excitation spread. Unfortunately, investigating this effect using the ECG itself is not possible since it is dominated by the MHD effect. Thus, we propose a novel method, based on an ultra-wideband radar technique (UWB radar) to monitor the global myocardial dynamics inside an MR scanner. Electromagnetic waves can propagate through the body and are reflected at interfaces between materials with different dielectric properties. This feature of UWB-Radar (1-10GHz, Prms~4mW) has proved its ability to monitor non-invasively the motion of organs within the human body as well as obtaining images of internal structures. |
