A total of 6 patients with intractable epilepsy underwent placement of a stereotactic frame with the center of the planned cranial flap equidistant from the fixation posts. The purpose of this study is to describe simultaneous frame-based insertion of depth electrodes and craniotomy for placement of subdural grids through a single surgical field and to determine the accuracy of depth electrodes placed using this technique. Munyon, Charles N Koubeissi, Mohamad Z Syed, Tanvir U Lüders, Hans O Miller, Jonathan Pįrame-based stereotaxy and open craniotomy may seem mutually exclusive, but invasive electrophysiological monitoring can require broad sampling of the cortex and precise targeting of deeper structures. (c) 2007 Wiley-Liss, Inc.Īccuracy of frame-based stereotactic depth electrode implantation during craniotomy for subdural grid placement. Needle placement error due to needle deflection was the most significant cause of error, especially for needles with an asymmetrical bevel. Needle placement error was clinically significant in MRI-guided biopsy for diagnosis of prostate cancer. Misalignment of the needle template guide contributed an error of 1.5 +/- 0.3 mm. Needle susceptibility artifacts observed a shift of 1.6 +/- 0.4 mm from the true needle axis. Phantom experiments showed significant placement error due to needle deflection with a needle with an asymmetrically beveled tip (3.2-8.7 mm depending on tissue type) but significantly smaller error with a symmetrical bevel (0.6-1.1 mm). The mean and standard deviation (SD) of errors in targeted biopsies was 6.5 +/- 3.5 mm. Needle placement error due to misalignment of the needle template guide was also evaluated. The source of these errors was subsequently investigated by measuring displacement caused by needle deflection and needle susceptibility artifact shift in controlled phantom studies. Needle placement error was assessed by comparing the coordinates of preplanned targets with the needle tip measured from the intraprocedural coherent gradient echo images. A total of 10 biopsies were performed with 18-gauge (G) core biopsy needle via a percutaneous transperineal approach. To quantify needle placement accuracy of magnetic resonance image (MRI)-guided core needle biopsy of the prostate. Transperineal prostate biopsy under magnetic resonance image guidance: a needle placement accuracy study.īlumenfeld, Philip Hata, Nobuhiko DiMaio, Simon Zou, Kelly Haker, Steven Fichtinger, Gabor Tempany, Clare M C
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