Journal article
Method for dose-reduced 3D catheter tracking on a scanning-beam digital x-ray system using dynamic electronic collimation
Proceedings of SPIE, the international society for optical engineering, Vol.9783, pp.97831Y-97831Y-12
02/27/2016
DOI: 10.1117/12.2216892
PMCID: PMC4925103
PMID: 27375314
Abstract
Scanning-beam digital x-ray (SBDX) is an inverse geometry x-ray fluoroscopy system capable of tomosynthesis-based 3D catheter tracking. This work proposes a method of dose-reduced 3D tracking using dynamic electronic collimation (DEC) of the SBDX scanning x-ray tube. Positions in the 2D focal spot array are selectively activated to create a region-of-interest (ROI) x-ray field around the tracked catheter. The ROI position is updated for each frame based on a motion vector calculated from the two most recent 3D tracking results. The technique was evaluated with SBDX data acquired as a catheter tip inside a chest phantom was pulled along a 3D trajectory. DEC scans were retrospectively generated from the detector images stored for each focal spot position. DEC imaging of a catheter tip in a volume measuring 11.4 cm across at isocenter required 340 active focal spots per frame, versus 4473 spots in full-FOV mode. The dose-area-product (DAP) and peak skin dose (PSD) for DEC versus full field-of-view (FOV) scanning were calculated using an SBDX Monte Carlo simulation code. DAP was reduced to 7.4% to 8.4% 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 3D tracking coordinates and full-FOV 3D tracking coordinates was less than 0.1 mm. The 3D distance between the tracked tip and the sheath centerline averaged 0.75 mm. Dynamic electronic collimation can reduce dose with minimal change in tracking performance.
Details
- Title: Subtitle
- Method for dose-reduced 3D catheter tracking on a scanning-beam digital x-ray system using dynamic electronic collimation
- Creators
- David A. P. Dunkerley - Dept. of Medical Physics, University of Wisconsin, Madison, WI, USA Triple Ring Technologies, Inc, Newark, CA, USA Dept. of Medicine, University of Wisconsin, Madison, WI, USATobias Funk - Triple Ring TechnologiesMichael A. Speidel - University of Wisconsin–Madison
- Resource Type
- Journal article
- Publication Details
- Proceedings of SPIE, the international society for optical engineering, Vol.9783, pp.97831Y-97831Y-12
- DOI
- 10.1117/12.2216892
- PMID
- 27375314
- PMCID
- PMC4925103
- eISBN
- 9781510600188; 1510600183
- ISSN
- 0277-786X
- eISSN
- 1996-756X
- Language
- English
- Date published
- 02/27/2016
- Academic Unit
- Radiation Oncology
- Record Identifier
- 9984312990102771
Metrics
14 Record Views