Mr. Sebastian Schmitt Profile

Sebastian Schmitt

at Westfaelische Hochschule

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Proceedings Article | 18 March 2015 Paper

Needle position estimation from sub-sampled k-space data for MRI-guided interventions

Sebastian Schmitt, Morwan Choli, Heinrich M. Overhoff

Proceedings Volume 9415, 94152G (2015) https://doi.org/10.1117/12.2082295

KEYWORDS: Data acquisition, Magnetic resonance imaging, Magnetism, Image quality, Image segmentation, Electroluminescent displays, Image visualization, Tissues, Biopsy, Robotics

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MRI-guided interventions have gained much interest. They profit from intervention synchronous data acquisition and image visualization. Due to long data acquisition durations, ergonomic limitations may occur. For a trueFISP MRI-data acquisition sequence, a time sparing sub-sampling strategy has been developed that is adapted to amagnetic needle detection. A symmetrical and contrast rich susceptibility needle artifact, i.e. an approximately rectangular gray scale profile is assumed. The 1-D-Fourier transformed of a rectangular function is a sinc-function. Its periodicity is exploited by sampling only along a few orthogonal trajectories in k-space. Because a needle moves during intervention, its tip region resembles a rectangle in a time-difference image that is reconstructed from such sub-sampled k-spaces acquired at different time stamps. In different phantom experiments, a needle was pushed forward along a reference trajectory, which was determined from a needle holders geometric parameters. In addition, the trajectory of the needle tip was estimated by the method described above. Only ca. 4 to 5% of the entire k-space data was used for needle tip estimation. The misalignment of needle orientation and needle tip position, i.e. the differences between reference and estimated values, is small and even in its worst case less than 2 mm. The results show that the method is applicable under nearly real conditions. Next steps are addressed to the validation of the method for clinical data.

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