(Sunday, 7/12/2020) [Eastern Time (GMT-4)]
Room: AAPM ePoster Library
Purpose: aim of the study was to define clinical DRLs for CT and Interventional Radiology (IR) procedures in Qatar
Methods: study was conducted in Hamad Medical Corporation (HMC), the main provider of secondary/tertiary healthcare in Qatar. HMC manages 13 hospitals, the National Ambulance
Service and home/residential care services. The CIs (10 CT and 3 IR) were chosen based on exam frequency. These ranged from CT evaluation in stroke, pre-evaluation in transcatheter aortic valve implantation to abdominal-pelvic CT for liver/abdominal metastases in colorectal cancer, IR for brain embolization and treatment of aneurysms. HMC has a dose monitoring system (Radiation Dose Monitor (RDM) Software, PACS Health, LLC) which facilitated collection of patient clinical/technical data. CT Effective dose (E) values were calculated by the RDM software. Methodology to develop DRLs followed international recommendations. Quantities for DRL determination were a) CT: Dose Length Product (DLP) and E, b) IR: Kerma-Area Product (KAP), Fluoroscopy time in min (T), number of images (F)
Results: sample included 1108 patients undertaking CT for 10 CIs and 3 neurological IR procedures. CT median values for DLP and E ranged from 181 Gy.cm (diffuse infiltrative lung disease) to 4175 Gy.cm (stroke) and 3.6 to 38.6 mSv, respectively. IR DRL median values range; KAP: 67-188 Gy.cm2, T: 12.4-33.7 min and F: 439-1298 images. The max/min dose ratio was 23 for CT and 2.8 for IR procedures.
Conclusion: clinical DRLs were established for 10 CT and 3 IR CIs in Qatar. The large differences in radiation dose, especially for CT, justify use of CI in DRL determination and points to immediate actions for dose optimization.
Keywords
Radiation Dosimetry, Radiography, Diagnostic Radiology
Taxonomy
IM- Radiation dose and risk: General (Most Aspects)
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