Program Information
Creation of a Pediatric Organ Dose Database for Diagnostic Fluoroscopy Procedures
E Marshall1*, D Rajderkar2 , J Brown3 , E Stepusin4 , W Bolch5 , (1) University of Florida, Gainesville, FL, (2) UF Health, Gainesville, FL, (3) University of Florida, Gainesville, FL, (4) University of Florida, Gainesville, FL, (5) University of Florida, Gainesville, FL
Presentations
WE-AB-601-4 (Wednesday, August 2, 2017) 7:30 AM - 9:30 AM Room: 601
Purpose: Development of a customizable pediatric organ dose database for the most frequently occurring diagnostic fluoroscopy procedures.
Methods: The four most frequently occurring pediatric fluoroscopy procedures are the upper gastrointestinal (UGI) series, lower gastrointestinal (LGI) series, voiding cystourethrogram (VCUG), and rehab swallows. In order to report organ doses via Monte Carlo simulations, procedural outlines were developed for each study, created by a pediatric radiologist to reflect current practice. These procedural outlines include the number of images, image field-of-view (FOV), fluoroscopy time per field, and anatomical location of contrast. Procedural outlines were then mapped onto 162 members of a pediatric computational phantom library with variations on both patient weight and height. Half-value layer measurements were taken on a 2004 GE Precision 500D fluoroscopy unit to characterize the beam energy spectra as a function of acrylic thickness. This information was applied to the procedural outline and Monte Carlo simulations to assess dose rates and phantom internal organ doses.
Results: Organ doses were calculated for all 162 phantoms across all four procedural outlines. Effective dose ranges for current practice of the UGI series were 0.1-5 mSv, LGI series were 0.04-1.16 mSv, VCUG were 0.29-1.72 mSv, and rehab swallow were 0.005-0.08 mSv. Peak organ doses varied widely across the different procedures; maximum dose recorded was to the spleen during the UGI (63.7 mSv). Males on average received a 6-8% higher effective dose compared to their female counterparts.
Conclusion: An organ dose database for the most frequent clinically performed pediatric fluoroscopy procedures has been developed for use by those seeking approximate organ and effective doses. The magnitude of the database, across all 162 pediatric phantoms, provides the first large scale estimates of diagnostic fluoroscopy patient dosimetry, while the scalability of the dose database enables it to be applied across a wide array of applications.
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