Abstract
The sensitivity and specificity of MDCT for depiction and localization of urothelial carcinoma (UC) was determined retrospectively. Axial and coronal four-row MDCT of the urinary tract (unenhanced, contrast-enhanced nephrographic, CT urography) was independently reviewed for UC by a radiologist (R1) and a urologist (R2), without other patient information, in 27 patients (22 male, five female; age, 72 ± 11 years) with previous UC and/or painless macroscopic haematuria. Urinary tract segments included bladder, right and left upper, middle, and lower caliceal groups, renal pelvis, uretero-pelvic junction, upper, middle, and lower ureter. MDCT findings were corroborated by surgery, other invasive procedures, and 1-year follow-up, including MDCT, intravenous urography, and cystoscopy. Receiver-operating characteristic analysis was undertaken and the the area under the curve (AUC) calculated. Eighteen of 27 patients had evidence of UC (pTa, n = 3; pT1-pT3, n = 15; TNM 2002). Tumor was correctly located by both R1 and R2 in 17 patients (sensitivity, 94%; 95% confidence interval, 84–100%) and ruled out in seven (specificity, 78%; 95% confidence interval, 51–100%), with complete agreement. Each detected ten of 11 upper urinary tracts affected by UC. For 35 urinary tract segments with UC and 308 without, the AUC was 0.910 ± 0.035 (R1) and 0.74 ± 0.055 (R2), z = 2.4772, Bonferroni-corrected P = 0.022. MDCT depicts urinary tracts affected by UC with high sensitivity and substantial agreement between readers with different training.
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Table A
Estimation of radiation dose in MD CT of the urinary tract (estimates for Siemens Volume Zoom four-row CT scanner) (min minimum, max maximum) (DOC 30 kb)
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Appendix
Estimation of radiation dose
Effective dose (E, measured in mSv) in CT of the abdomen and pelvis is influenced by several factors, some of which are estimated based on available measurements and technical considerations rather than being actually measured [39, 40]. For the four-row CT scanner applied here, V was 120 KVp, CTDIw,eff was 9.0 mGy per 100 mAs per slice at 1 mm collimation, and 7.6 mGy per 100 mAs per slice at 2.5 mm collimation (CT scanner software), PB was 0.49 [39], kCT was 1.0 [39], and fmean was 0.0072 for male patients and 0.0100 for female patients [41]. Estimated ranges of E in this study were 2.18–3.35 mSv (males) and 3.02–4.65 mSv (females) for unenhanced MDCT of the kidneys, 7.74–11.90 mSv (males) and 9.55–14.69 mSv (females) for MDCT from the diaphragm to the symphysis pubis in the nephrographic phase, and 4.91–9.26 mSv (males) and 5.84–11.02 mSv (females) for MDCT from the upper poles of the kidneys to the distal ureter in the excretory phase, respectively.
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Mueller-Lisse, U.G., Mueller-Lisse, U.L., Hinterberger, J. et al. Multidetector-row computed tomography (MDCT) in patients with a history of previous urothelial cancer or painless macroscopic haematuria. Eur Radiol 17, 2794–2803 (2007). https://doi.org/10.1007/s00330-007-0609-y
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DOI: https://doi.org/10.1007/s00330-007-0609-y