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Titolo:
Comparison of susceptibility artefacts of different RF-electrodes at 0.2 Tinfluence of alloy, sequence design and k-space acquisition methods.
Autore:
Lewin, JS;
Indirizzi:
Univ Hosp Cleveland, Dept Radiol, Cleveland, OH 44106 USA Univ Hosp Cleveland Cleveland OH USA 44106 adiol, Cleveland, OH 44106 USA Univ Hosp Cleveland, Dept Biomed Engn, Cleveland, OH 44106 USA Univ Hosp Cleveland Cleveland OH USA 44106 Engn, Cleveland, OH 44106 USA Case Western Reserve Univ, Cleveland, OH 44106 USA Case Western Reserve Univ Cleveland OH USA 44106 Cleveland, OH 44106 USA Univ Ulm Klinikum, Abt Diagnost Radiol, Ulm, Germany Univ Ulm Klinikum Ulm Germany inikum, Abt Diagnost Radiol, Ulm, Germany
Titolo Testata:
ROFO-FORTSCHRITTE AUF DEM GEBIET DER RONTGENSTRAHLEN UND DER BILDGEBENDEN VERFAHREN
fascicolo: 3, volume: 173, anno: 2001,
pagine: 257 - 262
SICI:
1438-9029(200103)173:3<257:COSAOD>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
GER
Soggetto:
RADIOFREQUENCY TISSUE ABLATION; INTERSTITIAL THERMAL ABLATION; MR-GUIDED BIOPSY; BRAIN-TUMORS; PRELIMINARY EXPERIENCE; LIVER METASTASES; ASPIRATION; THERMOMETRY; SYSTEM; FIELD;
Keywords:
interventional MRI; radiofrequency; susceptibility artifact; device visualization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Lewin, JS Univ Hosp Cleveland, Dept Radiol, 11100 Euclid Ave, Cleveland, OH 44106 USA Univ Hosp Cleveland 11100 Euclid Ave Cleveland OH USA 44106 USA
Citazione:
J.S. Lewin, "Comparison of susceptibility artefacts of different RF-electrodes at 0.2 Tinfluence of alloy, sequence design and k-space acquisition methods.", ROFO-F RONT, 173(3), 2001, pp. 257-262

Abstract

Purpose: interventional MRI procedure monitoring requires small but accurate susceptibility artifacts of the instruments used, In this investigation,susceptibility artifacts of different RE-electrode designs were compared using a variety of pulse sequences and k-space acquisition methods. Methods:4 different 18-gauge RF-electrodes (with three single electrodes made of stainless steel, copper, inconal, and a triple-clustered electrode configuration made of inconal) were placed in a 0.2T MR-scanner perpendicular to themain magnetic field. Pulse sequences used included: TSE T-2, FISP, true-FISP, PSIF, and a temperature sensitive ES-GRE sequence. In addition to the 2D Cartesian k-space trajectory with Fourier transformation (2DFT), projection reconstruction (PR) was used with the FISP, true-FISP and PSIF sequences. Results: The best tip accuracy was achieved with the combination of inconal electrodes and TSE it. The usefulness of the tested sequences was found to be: TSE T-2 > PSIF > FISP/true-FISP > ES-GRE. In general 2DFT provided better or equal tip accuracy than PR. The apparent shaft width was smaller using the copper electrode compared to the inconal electrode. However, the "match shaped" tip artifact of the copper probe led to a higher error in tipaccuracy. Conclusions: TSE-T-2 sequences and Cartesian 2DFT acquisitions should be used for accurate tip positioning at 0.2T. Further, artifact size of the electrode shaft prevents the use of inconal for temperature sensitive sequences. Copper electrodes can be used for these purposes, although copper is not considered to be biocompatible at present.

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Documento generato il 23/01/20 alle ore 06:51:25