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DOI: 10.1055/s-0029-1245727
© Georg Thieme Verlag KG Stuttgart · New York
Continuously Moving Table MRI in Oncology
MRT mit kontinuierlicher Tischbewegung in der OnkologiePublication History
received: 9.6.2010
accepted: 18.8.2010
Publication Date:
04 October 2010 (online)
![](https://www.thieme-connect.de/media/roefo/201011/lookinside/thumbnails/10.1055-s-0029-1245727-1.jpg)
Zusammenfassung
Die Magnetresonanztomografie (MRT) bei kontinuierlich bewegtem Patiententisch ist eine moderne Untersuchungsmethode, um ein erweitertes, stufenloses Bildfeld in z-Richtung zu akquirieren. Die technische Realisierung kann mittels sehr schneller Sequenzen wie echoplanarer Bildgebung erfolgen, wobei die Bewegung bei der Bilderstellung und Rekonstruktion vernachlässigt werden kann. Andere Kontraste erfordern jedoch eine Bewegungskorrektur, entweder während der Messung oder im Rahmen der Bildberechnung. In ersten klinischen Studien zeigte die Anwendung schneller Steady-State-Sequenzen bereits vielversprechende Ergebnisse hinsichtlich der Detektierbarkeit von Metastasen gegenüber diagnostischen Routineverfahren. Allerdings wird zur Tischbewegung und Positionskontrolle zusätzliches Equipment benötigt. Die später entwickelte Sliding-Multislice (SMS)-Technik erfolgt ohne zusätzliche Hardware. Klinische Arbeiten belegen eine gegenüber stationär aufgenommenen Sequenzen analoge Bildqualität und eine mit der Computertomografie (CT) vergleichbare Erkennbarkeit von pulmonalen und abdominellen Metastasen. Die kurzen Untersuchungszeiten ermöglichen eine Integration der MRT bei kontinuierlicher Tischbewegung in für die Tumordiagnostik spezialisierte, stationäre Protokolle mit dem Ziel einer Kombination aus lokalem Staging und thorakoabdomineller Metastasensuche in einem Untersuchungsgang. Neue Kontraste wie Diffusionsbildgebung oder Dixon-Techniken sowie weitere Verbesserungen des Workflows durch Atemkompensation und intuitive Planungssequenzen befinden sich in der Entwicklung und werden die klinischen Anwendungsmöglichkeiten dieser Technik erweitern.
Abstract
Magnetic resonance imaging (MRI) with a continuously moving table (CMT) represents a novel method allowing for the seamless acquisition of an extended field-of-view in the z-direction. One option to realize CMT MRI from a technical point of view is based on very fast sequences like echo planar imaging (EPI). Consequently, table translation for signal sampling and image reconstruction can be neglected. The acquisition of different contrasts, however, necessitates table motion correction, either during acquisition or via post-processing. First clinical studies applying fast steady-state imaging already yielded promising results with respect to metastasis detection. Nevertheless, additional equipment has to be installed for table motion and position tracking. In contrast, the subsequently developed sliding multislice (SMS) technique can be implemented without any additional hardware. In clinical studies, the achievable image quality corresponds to stationary sequences. Additionally, the use of SMS for the detection of pulmonary and abdominal metastases appears to be comparable to computed tomography (CT). Due to the relatively short examination times, CMT MRI can be integrated into highly specialized stationary imaging protocols, thus increasing the possibility to combine local staging with thoracoabdominal metastasis screening within one examination. New contrasts like diffusion-weighted imaging (DWI) or Dixon techniques as well as improved workflow including breathing motion compensation and intuitive scout acquisition have already been proposed and will further expand the clinical applications of this technique.
Key words
continuously moving table MRI - whole-body MRI - staging
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Prof. Arnd-Oliver Schaefer
Radiologische Klinik, Universitätsklinikum Freiburg
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