Abstract: CT KUB scans for renal colic should be limited to scanning be-tween the upper pole of the highest kidney and the pubic symphysis to minimise unnecessary irradiation. This audit aimed to assess the amount of unnecessary irradiation in CT KUBs outside of this defined scanning field. The standard was 100% of scans should have less than 10% unnecessary scanning above the highest kidney. 10% (9/88) scans met this target. The average over-scanning was around 17% of the whole scan. We also found that 100% of scanned kidneys lied below the lower border of T10 vertebra. As such, we have identified and recommend the T10 vertebra as a marker to start the upper end of a CT KUB scan. This will allow the whole kidney to be imaged while minimising unnecessary scanning above the kidney.Summary: Optimisation of CT KUB scanning for renal colic, suggesting that the optimal position to begin a CT KUB scan in these patients is at the T10 vertebral level.References: Smith-Bindman R, Lipson J, Marcus R, et al. Radiation Dose Associated With Common Computed Tomography Examinations and the Associated Lifetime Attributable Risk of Cancer. Arch Intern Med. 2009;169(22):2078–2086.
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