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The Rotate-Plus-Shift C-Arm Trajectory: Theory and First Clinical Results

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L Ritschl

L Ritschl1*, M Kachelriess2 , J Kuntz3 , (1) Ziehm Imaging GmbH, Nuernberg, Deutschland, (2) DKFZ Heidelberg, FS05, Heidelberg, ,(3) DKFZ Heidelberg, Heidelberg, Deutschland


WE-EF-207-2 (Wednesday, July 15, 2015) 1:45 PM - 3:45 PM Room: 207

The proposed method enables the acquisition of a complete dataset for 3D reconstruction of C-Arm data using less than 180° rotation.

Typically a C–arm cone–beam CT scan is performed using a circle–like trajectory around a region of interest. Therefore an angular range of at least 180° plus fan–angle must be covered to ensure a completely sampled data set. This fact defines some constraints on the geometry and technical specifications of a C–arm system, for example a larger C radius or a smaller C opening respectively. This is even more important for mobile C-arm devices which are typically used in surgical applications.
To overcome these limitations we propose a new trajectory which requires only 180° minus
fan–angle of rotation for a complete data set. The trajectory consists of three parts: A rotation of the C around a defined iso–center and two translational movements parallel to the detector plane at the begin and at the end of the rotation (rotate plus shift trajectory). This enables the acquisition of a completely sampled dataset using only 180° minus fan–angle of rotation.

For the evaluation of the method we show simulated and measured data. The results show, that the rotate plus shift scan yields equivalent image quality compared to the short scan which is assumed to be the gold standard for C-arm CT today. Compared to the pure rotational scan over only 165°, the rotate plus shift scan shows strong improvements in image quality.

The proposed method makes 3D imaging using C–arms with less than 180° rotation range possible. This enables integrating full 3D functionality into a C- arm device without any loss of handling and usability for 2D imaging.

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