Dose reduction technique using a combination of a region of interest (ROI) material x-ray attenuator and spatially different temporal filtering for fluoroscopic interventions

S. N. Swetadri Vasan; A. Panse; A. Jain; P. Sharma; Ciprian N. Ionita; A. H. Titus; A. N. Cartwright; D. R. Bednarek; S. Rudin

doi:10.1117/12.910945

9 March 2012 Dose reduction technique using a combination of a region of interest (ROI) material x-ray attenuator and spatially different temporal filtering for fluoroscopic interventions

S. N. Swetadri Vasan, A. Panse, A. Jain, P. Sharma, Ciprian N. Ionita, A. H. Titus, A. N. Cartwright, D. R. Bednarek, S. Rudin

Author Affiliations +

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 831357 (2012) https://doi.org/10.1117/12.910945
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

We demonstrate a novel approach for achieving patient dose savings during image-guided neurovascular interventions, involving a combination of a material x-ray region of interest (ROI) attenuator and a spatially different ROI temporal filtering technique. The part of the image under the attenuator is reduced in dose but noisy and less bright due to fewer x-ray quanta reaching the detector, as compared to the non-attenuating (or less attenuating) region. First the brightness is equalized throughout the image by post processing and then a temporal filter with higher weights is applied to the high attenuating region to reduce the noise, at the cost of increased lag; however, in the regions where less attenuation is present, a lower temporal weight is needed and is applied to preserve temporal resolution. A simulation of the technique is first presented on an actual image sequence obtained from an endovascular image guided interventional (EIGI) procedure. Then the actual implementation of the technique with a physical ROI attenuator is presented. Quantitative analysis including noise analysis and integral dose calculations are presented to validate the proposed technique.

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S. N. Swetadri Vasan, A. Panse, A. Jain, P. Sharma, Ciprian N. Ionita, A. H. Titus, A. N. Cartwright, D. R. Bednarek, and S. Rudin "Dose reduction technique using a combination of a region of interest (ROI) material x-ray attenuator and spatially different temporal filtering for fluoroscopic interventions", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 831357 (9 March 2012); https://doi.org/10.1117/12.910945

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