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Abdominal spiral CT in children: which radiation exposure is required?
D Wormanns1, S Diederich, H Lenzen
1Department of Clinical Radiology, University of Münster, 48129 Münster, Germany. dag.wormanns@uni-muenster.de
Insights
Reduced radiation exposure in pediatric abdominal CT scans is possible for most structures. However, standard radiation levels are superior for visualizing small details in the right upper quadrant.
Area of Science:
- Radiology
- Pediatric Imaging
- Medical Physics
Background:
- Pediatric abdominal computed tomography (CT) involves radiation exposure.
- Optimizing radiation dose while maintaining diagnostic image quality is crucial in children.
Purpose of the Study:
- To evaluate the feasibility of dose reduction in pediatric abdominal spiral CT.
- To determine if reduced radiation exposure impacts diagnostic information.
Main Methods:
- Retrospective analysis of 30 abdominal CT scans in children (3 months to 7 years).
- Comparison of reduced radiation exposure (50 mA, CTDIFDA ≤ 0.83 mGy) versus standard exposure (≥ 100 mA, CTDIFDA ≥ 1.66 mGy).
- Image quality assessed by 5 radiologists based on visual impression and visibility of 32 anatomical details.
Main Results:
- No difference in overall visual image impression between reduced and standard dose groups.
- Reduced dose group showed significantly lower detail visibility for right upper quadrant structures and arterial branches.
- Poor visibility was significantly higher for hepatic, splenic, and renal arteries in the reduced dose group.
Conclusions:
- A reduced radiation protocol (50 mA, CTDIFDA ≤ 0.83 mGy) is adequate for demonstrating most abdominal structures in young children.
- Standard radiation protocols (≥ 100 mAs) are superior for precise visualization of small details, particularly in the right upper quadrant.
Abstract:
We decided to test to what extent dose reduction is possible in abdominal spiral computed tomography (CT) in young children without loss of anatomic diagnostic information. A retrospective study was performed of 30 abdominal CT examinations of children aged 3 months to 7 years. These were divided into two groups: group A with reduced radiation exposure (tube current 50 mA, CT dose index CTDIFDA < or =0.83 mGy) and group B with standard radiation exposure (tube current > or =100 mA, CTDIFDA > or =1.66 mGy). Image quality was assessed using a four-part scale ('excellent', 'good', 'sufficient', 'poor') on visual image impression and visibility of 32 anatomical details. Five experienced radiologists read the CT scans independently who were blinded to the examination parameters. Differences in ranked data were evaluated with Wilcoxon's rank sum test. No difference between groups A and B was observed in visual image impression. Detail visibility was significantly lower in group A, but the differences were limited to right upper quadrant structures (portal vein, common bile duct, pancreatic head, adrenals) and to arterial branches. Significant differences in visibility rated as 'poor' were only found for the hepatic, splenic and renal arteries; all other structures showed no difference between groups A and B. A protocol with reduced radiation exposure (50 mA, CTDIFDA < or =0.83 mGy) allowed the demonstration of most anatomic structures in abdominal spiral CT in young children. For the precise demonstration of small details (e.g. structures of the right upper quadrant), a protocol with standard radiation exposure (> or =100 mAs) was superior.