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Ray sum image: its efficacy in renal tract calculus detection.
S Deb1, Z Lu2, A Kuganesan1
1Department of Diagnostic Imaging, Monash Health, Victoria, Australia.
Clinical Radiology
|May 1, 2019
Summary
A ray sum image from CT KUB shows promise in detecting kidney stones, potentially replacing abdominal X-rays. This method could reduce patient radiation exposure and improve workflow efficiency in radiology departments.
Area of Science:
- Radiology
- Medical Imaging
- Urology
Background:
- Renal tract calculi detection often relies on abdominal radiography (AXR).
- Computed tomography of the kidneys, ureters, and bladder (CT KUB) is a common diagnostic tool for urolithiasis.
- The utility of derived images from CT KUB for calculus detection requires further investigation.
Purpose of the Study:
- To evaluate the efficacy of ray sum images from CT KUB in detecting renal tract calculi.
- To determine if ray sum images can replace baseline AXR for urolithiasis assessment.
- To analyze factors influencing the sensitivity of both AXR and ray sum images.
Main Methods:
- Retrospective analysis of adult patients with urolithiasis who underwent both AXR and CT KUB.
- Blind review of AXR and ray sum images by two independent readers.
- Analysis of patient factors (thickness, gas/fecal material) and calculus characteristics (size, location, attenuation) impacting detection sensitivity.
Main Results:
- Ray sum images demonstrated a sensitivity of 44% for detecting calculi, compared to 30% for AXR.
- Calculus size and mean attenuation significantly impacted the sensitivity of both imaging techniques.
- Substantial agreement was observed between ray sum images and AXR (Kappa = 0.70).
Conclusions:
- Ray sum images derived from CT KUB datasets represent a potential alternative to baseline AXR for patients with CT-proven urolithiasis.
- This approach may lead to reduced patient radiation dose.
- Implementing ray sum images could streamline workflows in radiology and emergency departments.
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