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01-05-2019 | Original Article

Radiation dose monitoring in pediatric fluoroscopy: comparison of fluoroscopy time and dose–area product thresholds for identifying high-exposure cases

Authors: Matthew S. Lazarus, Benjamin H. Taragin, William Malouf, Terry L. Levin, Eduardo Nororis, Alan H. Schoenfeld, Amichai J. Erdfarb

Published in: Pediatric Radiology | Issue 5/2019

Abstract

Background

Fluoroscopy time has been used as a surrogate for radiation dose monitoring in pediatric fluoroscopy; however it does not account for factors such as magnification or collimation. Dose–area product (DAP) is a more accurate measure of radiation exposure but its dependence on patient weight and body-part thickness is a challenge in children of varying ages.

Objective

To determine whether fluoroscopy time and DAP produce concurrent results when they are used to identify high-exposure cases, and to establish radiation dose thresholds for our institution.

Materials and methods

During a 2-year period we prospectively monitored pediatric fluoroscopy studies performed at the Children’s Hospital at Montefiore. We recorded study type, fluoroscopy time, DAP, patient age, weight and height. We then calculated 90th percentile fluoroscopy time and DAP thresholds for weight and age.

Results

We evaluated 1,011 cases (453 upper gastrointestinal [UGI] series, 266 voiding cystourethrograms [VCUGs], 120 contrast enemas, 108 speech studies, and 64 esophagrams). Fluoroscopy time demonstrated moderate correlation with DAP (r_s=0.45, P<0.001, Spearman rank). DAP strongly correlated with patient weight (r_s=0.71, P<0.001) and age (r_s=0.70, P<0.001). Concordance of cases exceeding 90th percentile thresholds for fluoroscopy time and DAP were κ=0.27 for UGI series and κ=0.49 for VCUG for weight-based cutoffs, and κ=0.36 for UGI series and κ=0.40 for VCUG for age-based cutoffs.

Conclusion

The limited correlation of fluoroscopy time with DAP suggests these methods are not equivalent for dose monitoring. However, the strong correlation of DAP with patient weight and age presents a challenge for establishing DAP thresholds in children, who range widely in size. Despite controlling for weight or age, there was limited overlap of cases exceeding the 90th percentile threshold for fluoroscopy time and DAP. This further reinforces the non-overlapping outcome of these two methods and indicates that fluoroscopy time might be inadequate for dose monitoring.

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Title: Radiation dose monitoring in pediatric fluoroscopy: comparison of fluoroscopy time and dose–area product thresholds for identifying high-exposure cases
Authors: Matthew S. Lazarus
Benjamin H. Taragin
William Malouf
Terry L. Levin
Eduardo Nororis
Alan H. Schoenfeld
Amichai J. Erdfarb
Publication date: 01-05-2019
Publisher: Springer Berlin Heidelberg
Published in: Pediatric Radiology / Issue 5/2019
Print ISSN: 0301-0449
Electronic ISSN: 1432-1998
DOI: https://doi.org/10.1007/s00247-018-04335-8

At a glance: The STEP trials

Springer Medicine

Radiation dose monitoring in pediatric fluoroscopy: comparison of fluoroscopy time and dose–area product thresholds for identifying high-exposure cases

Abstract

Background

Objective

Materials and methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Objective

Materials and methods

Results

Conclusion

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