Congress:
EuroSafe Imaging 2021
Keywords:
Interventional non-vascular, Radiation physics, Radioprotection / Radiation dose, Fluoroscopy, Dosimetry, Radiation safety, Dosimetric comparison
Authors:
P. GARCIA CASTAÑON, P. Botella Faus, S. HONORATO HERNANDEZ, R. FAYOS-SOLA CAPILLA, P. Rodriguez Carnero, C. PRIETO MARTIN
DOI:
10.26044/esi2021/ESI-11875
Methods or background
The study has been performed at the operating theatre of University Hospital la Princesa (Madrid, Spain). 7 C-arm devices are available to perform different surgical fluoroscopically guided procedures by different medical departments, such as Urology, Digestive Endoscopy, Orthopaedia, Neurosurgery or Pain units. Only 6 have been included in the study, installed between 2005 and 2013, as one of them does not provide any dosimetric information. All C-arm devices (2 Philips, 3 General Electric, 1 Siemens) are subjected to a periodic quality assurance programme.
Dosimetric Quantities utilized for dose assessment in inteventional procedures, according to ICRP publication number 135 (9) are: Kerma Area Product (KAP), Entrance surface air kerma (E) and fluoroscopy time (t) . The quantity of choice to establish local DRLs in this study was the KAP, because E is specified at a different distance from effective focal spot for each c-arm device.
The data have been recorded manually by the technicians after each procedure, for these units are not connected to the hospital’s PACS system, and are transferred to a database contained in the HIS system. A training course was provided to the technicians in order to obtain the proper data for each unit.
About 1000 data have been recorded and then analysed and verified. The data have been classified by procedure and/or specialty and outliers were dismissed. Most common procedures of each specialty have been selected. Then, for each sample, 50th percentile of KAP values has been calculated (9). Then, values obtained have been rounded to obtain an initial local DRL.