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Biopsy Needle Artifact Localization in MRI-Guided Robotic Transrectal Prostate Intervention

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8 Author(s)
Sang-Eun Song ; Lab. for Comput. Sensing & Robot., Johns Hopkins Univ., Baltimore, MD, USA ; Cho, N.B. ; Iordachita, I.I. ; Guion, P.
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Recently a number of robotic intervention systems for magnetic resonance image (MRI)-guided needle placement in the prostate have been reported. In MRI-guided needle interventions, after a needle is inserted, the needle position is often confirmed with a volumetric MRI scan. Commonly used titanium needles are not directly visible in an MRI, but they generate a susceptibility artifact in the immediate neighborhood of the needle. This paper reports the results of a quantitative study of the relationship between the true position of titanium biopsy needle and the corresponding needle artifact position in MRI, thereby providing a better understanding of the influence of needle artifact on targeting errors. The titanium needle tip artifact extended 9 mm beyond the actual needle tip location with tendency to bend toward the scanner's B magnetic field direction, and axially displaced 0.38 and 0.32 mm (mean) in scanner's frequency and phase encoding direction, respectively.

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Biomedical Engineering, IEEE Transactions on  (Volume:59 ,  Issue: 7 )