Gabor Fichtinger

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Biopsy needle artifact localization in MRI-guided robotic transrectal prostate intervention.

Sang-Eun Song; Nathan Bongjoon Cho; Iulian I Iordachita; Peter Guion; Gabor Fichtinger; Aradhana Kaushal; Kevin Camphausen; Louis L Whitcomb (Profiled Author: Gabor Fichtinger)

Johns Hopkins University, Baltimore, MD 21202, USA. sam0song@gmail.com
IEEE transactions on bio-medical engineering 2012;59(7):1902-11.

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 (0) 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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