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Automatic passive tracking of an endorectal prostate biopsy device using phase‐only cross‐correlation
Author(s) -
de Oliveira André,
Rauschenberg Jaane,
Beyersdorff Dirk,
Semmler Wolfhard,
Bock Michael
Publication year - 2008
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.21430
Subject(s) - computer science , tracking (education) , imaging phantom , artifact (error) , biopsy , position (finance) , prostate , artificial intelligence , computer vision , nuclear medicine , medicine , radiology , cancer , finance , economics , psychology , pedagogy
Abstract MR‐guided transrectal prostate biopsy is currently a time‐consuming procedure because the imaging slice is often manually realigned with the biopsy needle during lesion targeting. In this work a pulse sequence is presented that automatically follows a passive marker attached to a dedicated MR biopsy device holder, thus providing an alternative to existing active tracking methods. In two orthogonal tracking FLASH images of the marker the position of the needle axis is automatically identified using a phase‐only cross‐correlation (POCC) algorithm. The position information is then used to realign a trueFISP imaging slice in real time. In phantom experiments the sensitivity of this technique to initial misalignments of the marker and to the signal‐to‐noise ratio was evaluated. In several puncture experiments the precision of the needle placement was analyzed. The POCC algorithm allowed for a precise identification of the marker in the images even under severe initial misalignments of up to 45°. At a frame rate 1 image/s a precision of the needle placement of 1.5 ± 1.1 mm could be achieved. Magn Reson Med 59:1043–1050, 2008. © 2008 Wiley‐Liss, Inc.