Int J Comput Assist Radiol Surg - Accuracy analysis in MRI-guided robotic prostate biopsy.

Tópicos

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Resumo

RPOSE: To assess retrospectively the clinical accuracy of an magnetic resonance imaging-guided robotic prostate biopsy system that has been used in the US National Cancer Institute for over 6 years.METHODS: Series of 2D transverse volumetric MR image slices of the prostate both pre (high-resolution T2-weighted)- and post (low-resolution)- needle insertions were used to evaluate biopsy accuracy. A three-stage registration algorithm consisting of an initial two-step rigid registration followed by a B-spline deformable alignment was developed to capture prostate motion during biopsy. The target displacement (distance between planned and actual biopsy target), needle placement error (distance from planned biopsy target to needle trajectory), and biopsy error (distance from actual biopsy target to needle trajectory) were calculated as accuracy assessment.RESULTS: A total of 90 biopsies from 24 patients were studied. The registrations were validated by checking prostate contour alignment using image overlay, and the results were accurate to within 2 mm. The mean target displacement, needle placement error, and clinical biopsy error were 5.2, 2.5, and 4.3 mm, respectively.CONCLUSION: The biopsy error reported suggests that quantitative imaging techniques for prostate registration and motion compensation may improve prostate biopsy targeting accuracy.

Resumo Limpo

rpose assess retrospect clinic accuraci magnet reson imagingguid robot prostat biopsi system use us nation cancer institut yearsmethod seri d transvers volumetr mr imag slice prostat pre highresolut tweight post lowresolut needl insert use evalu biopsi accuraci threestag registr algorithm consist initi twostep rigid registr follow bspline deform align develop captur prostat motion biopsi target displac distanc plan actual biopsi target needl placement error distanc plan biopsi target needl trajectori biopsi error distanc actual biopsi target needl trajectori calcul accuraci assessmentresult total biopsi patient studi registr valid check prostat contour align use imag overlay result accur within mm mean target displac needl placement error clinic biopsi error mm respectivelyconclus biopsi error report suggest quantit imag techniqu prostat registr motion compens may improv prostat biopsi target accuraci

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