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  • Title: [Retrospective 5-year analysis of MR-guided biopsies in a low-field MR system].
    Author: Zangos S, Müller C, Mayer F, Naguib NN, Nour-Eldin NE, Hansmann ML, Herzog C, Hammerstingl RM, Thalhammer A, Mack M, Vogl TJ, Eichler K.
    Journal: Rofo; 2009 Jul; 181(7):658-63. PubMed ID: 19517340.
    Abstract:
    PURPOSE: The purpose of this study was to evaluate the safety and clinical value of MR-guided biopsies in an open 0.2 T low-field system. MATERIALS AND METHODS: A total of 322 patients with suspicious lesions of different body regions were biopsied in a low-field MRI system (0.2 T, Concerto, Siemens). The procedures were guided using T 1-weighted Flash sequences (TR/TE = 100/9; 70 degrees). The lesions were repeatedly biopsied using the coaxial technique with a 15-gauge (diameter 2 mm) puncture needle. Complications and biopsy findings were analyzed retrospectively. RESULTS: In all cases the biopsy procedures were successfully performed with MR guidance. In 298 patients diagnosis was able to be confirmed on the basis of the probes. The clinical follow-up showed that in 24 patients the lesions were missed by MR-guided biopsy. From this a sensitivity of 86%, a specificity of 87% and an accuracy of 93% were calculated. In two patients major complications were observed (morbidity rate 0.6 %). CONCLUSION: MR-guided biopsy can be performed safely and precisely in a low-field MR system and are a supplement to US or CT-guided biopsies.
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