Physics of Medical Imaging

Dynamic electronic collimation method for 3-D catheter tracking on a scanning-beam digital x-ray system

[+] Author Affiliations
David A. P. Dunkerley, Jordan M. Slagowski

University of Wisconsin—Madison, Department of Medical Physics, Madison, Wisconsin, United States

Tobias Funk

Triple Ring Technologies, Inc., Newark, California, United States

Michael A. Speidel

University of Wisconsin—Madison, Department of Medical Physics, Madison, Wisconsin, United States

University of Wisconsin—Madison, Department of Medicine, Madison, Wisconsin, United States

J. Med. Imag. 4(2), 023501 (Apr 18, 2017). doi:10.1117/1.JMI.4.2.023501
History: Received December 6, 2016; Accepted March 30, 2017
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Abstract.  Scanning-beam digital x-ray (SBDX) is an inverse geometry x-ray fluoroscopy system capable of tomosynthesis-based 3-D catheter tracking. This work proposes a method of dose-reduced 3-D catheter tracking using dynamic electronic collimation (DEC) of the SBDX scanning x-ray tube. This is achieved through the selective deactivation of focal spot positions not needed for the catheter tracking task. The technique was retrospectively evaluated with SBDX detector data recorded during a phantom study. DEC imaging of a catheter tip at isocenter required 340 active focal spots per frame versus 4473 spots in full field-of-view (FOV) mode. The dose-area product (DAP) and peak skin dose (PSD) for DEC versus full FOV scanning were calculated using an SBDX Monte Carlo simulation code. The average DAP was reduced to 7.8% of the full FOV value, consistent with the relative number of active focal spots (7.6%). For image sequences with a moving catheter, PSD was 33.6% to 34.8% of the full FOV value. The root-mean-squared-deviation between DEC-based 3-D tracking coordinates and full FOV 3-D tracking coordinates was less than 0.1 mm. The 3-D distance between the tracked tip and the sheath centerline averaged 0.75 mm. DEC is a feasible method for dose reduction during SBDX 3-D catheter tracking.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

David A. P. Dunkerley ; Jordan M. Slagowski ; Tobias Funk and Michael A. Speidel
"Dynamic electronic collimation method for 3-D catheter tracking on a scanning-beam digital x-ray system", J. Med. Imag. 4(2), 023501 (Apr 18, 2017). ; http://dx.doi.org/10.1117/1.JMI.4.2.023501


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