Updates in the real-time dose tracking system (DTS) to improve the accuracy in calculating the radiation dose to the
patients skin during fluoroscopic procedures

Vijay K. Rana; Stephen Rudin; Daniel R. Bednarek

doi:10.1117/12.2007706

6 March 2013 Updates in the real-time dose tracking system (DTS) to improve the accuracy in calculating the radiation dose to the patients skin during fluoroscopic procedures

Vijay K. Rana, Stephen Rudin, Daniel R. Bednarek

Author Affiliations +

Proceedings Volume 8668, Medical Imaging 2013: Physics of Medical Imaging; 86683Z (2013) https://doi.org/10.1117/12.2007706
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

We have developed a dose-tracking system (DTS) to manage the risk of deterministic skin effects to the patient during fluoroscopic image-guided interventional cardiac procedures. The DTS calculates the radiation dose to the patient's skin in real-time by acquiring exposure parameters and imaging-system geometry from the digital bus on a Toshiba C-arm unit and displays the cumulative dose values as a color map on a 3D graphic of the patient for immediate feedback to the interventionalist. Several recent updates have been made to the software to improve its function and performance. Whereas the older system needed manual input of pulse rate for dose rate calculation and used the CPU clock with its potential latency to monitor exposure duration, each x-ray pulse is now individually processed to determine the skin-dose increment and to automatically measure the pulse rate. We also added a correction for the table pad which was found to reduce the beam intensity to the patient for under-table projections by an additional 5-12% over that of the table alone at 80 kVp for the x-ray filters on the Toshiba system. Furthermore, mismatch between the DTS graphic and the patient skin can result in inaccuracies in dose calculation because of inaccurate inverse-square-distance calculation. Therefore, a means for quantitative adjustment of the patient-graphic-model position and a parameterized patient-graphic library have been developed to allow the graphic to more closely match the patient. These changes provide more accurate estimation of the skin-dose which is critical for managing patient radiation risk.

Citation Download Citation

Vijay K. Rana, Stephen Rudin, and Daniel R. Bednarek "Updates in the real-time dose tracking system (DTS) to improve the accuracy in calculating the radiation dose to the patients skin during fluoroscopic procedures", Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 86683Z (6 March 2013); https://doi.org/10.1117/12.2007706

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