Real-time MR-guided Wire Localization of Breast Lesions by Using an Open 1.0-T Imager: Initial Experience

Abstract

The purpose of this study was to prospectively evaluate technique and time factors for real-time magnetic resonance (MR) imaging-guided wire localization of suspicious breast lesions by using an open 1.0-T MR imager. It was conducted with institutional review board approval; informed consent was given by patients. Needle placement was monitored in 30 women (mean age, 50.5 years; range, 28-70 years) by using a dynamic balanced gradient-echo (single-shot turbo field-echo [TFE]) sequence with a temporal resolution of 0.5 second. In all patients, the tip of the needle was clearly identified during placement. Consistent with balanced TFE (BTFE) imaging, diagnostic MR imaging after the interventional procedure confirmed that the hookwires were placed 0-6 mm (mean, 3.3 mm) from the target lesions. The total procedure time ranged from 16-36 minutes. Results show that real-time MR-guided wire localization permits correction of the needle position during placement and reduces the interventional procedure time.

Radio-guided occult lesion localisation for breast lesions under computer-aided MRI guidance: the first experience and initial results

“…Considering the differences in the technical aspects of the previously published studies that used MRI-guided wire localisation techniques, our mean total magnet time was longer than the 21 min reported by Gossmann et al [9], similar to the 31 min reported by Morris et al [6], and shorter than the 62 min reported by Causer et al [10] and the 64 min reported by Daniel et al [27].…”

“…Histopathological assessment can be performed by MRI-guided wire localisation followed by surgical excision [6,9,10], or by alternative techniques to surgery such as MRI-guided percutaneous biopsy using fine needles [11], core needles [12,13] or vacuum-assisted biopsy devices [7,14]. For such a breast intervention to be clinically useful, factors such as safety, accuracy, availability, cost, patient preference for surgical biopsy and surgeon's request should be considered.…”

“…Several authors have reported success with this technique for surgical biopsy [6][7][8][9][10]. According to them, it can be performed quickly and safely with relatively simple methods and commercially available equipment.…”

Freehand MRI‐guided preoperative needle localization of breast lesions after MRI‐guided vacuum‐assisted core needle biopsy without marker placement

“…The freehand method of MRI-guided breast interventions (8-10) differs from other facilities that use a grid and contrast enhancement prior to needle placement (6,7,(13)(14)(15)(16)(17)(18). This method uses noncontrast T1-weighted scans to identify unenhanced targets in the noncompressed breast without a grid (8,9).…”

MR-guided liver tumor ablation employing open high-field 1.0T MRI for image-guided brachytherapy

“…The latter magnet is configured in a doughnut design, using two superconductive coils as part of a yoke to generate a vertical magnetic field with specific challenges and opportunities [21,22].…”