Abstract
Objective
To assess the accuracy of targeted dual-energy single-source multi-detector CT (MDCT) for characterisation of urinary calculi.
Methods
For proof of principle, 71 ex-vivo calculi underwent single-source 256-slice MDCT. Low-dose CT was performed in 154 patients with suspected urinary calculi. In 104 patients with urinary calculi targeted dual-energy imaging within one breath-hold was added. 46 patients with sufficient material for infrared-spectroscopy were analysed. Potential anatomical misregistrations between 80- and 140-kVp-images and HU-values were measured. DEIs (dual-energy-indices) were compared with the standard of reference. Effective doses were calculated.
Results
In 26 of 46 patients no misregistration was present. Mean deviations were 2.7 mm in the z-axis (16 patients) and 4.3 mm in the axial plane (10 patients). The DEIs were 0.018 ± 0.016 for uric acid (UA), 0.035 ± 0.015 for mixed UA and 0.102 ± 0.015 for calcified stones in-vitro and 0.017 ± 0.002 for UA, 0.050 ± 0.019 for mixed UA and 0.122 ± 0.024 for calcified calculi in-vivo. Significant differences were noted among calcium, mixed UA and UA stones (p < 0.05). For the low-dose examination mean effective dose was 3.11 mSv. Targed dual-energy resulted in an extra dose of 1.84 mSv (additional 59.1%).
Conclusion
Targeted dual-energy imaging within one breath-hold is feasible for characterisation of urinary calculi using single-source MDCT allowing minimal anatomical discordance.
Key Points
• Targeted dual-energy single-source CT is feasible for characterizing urinary calculi
• Dual Energy Index discriminates between uric-acid and non-uric-acid containing stones
• It provides ancillary for decisions about stone removal or metaphylaxis
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References
Brown J (2006) Diagnostic and treatment patterns for renal colic in US emergency departments. Int Urol Nephrol 38:87–92
Smith RC, Rosenfield AT, Choe KA, Essenmacher KR, Verga M, Glickman MG, Lange RC (1995) Acute flank pain: comparison of non-contrast-enhanced CT and intravenous urography. Radiology 194:789–794
Boulay I, Holtz P, Foley WD, White B, Begun FP (1999) Ureteral calculi: diagnostic efficacy of helical CT and implications for treatment of patients. AJR Am J Roentgenol 172:1485–1490
Tamm EP, Silverman PM, Shuman WP (2003) Evaluation of the patient with flank pain and possible ureteral calculus1. Radiology 228:319–329
Dalla Palma L, Pozzi-Mucelli R, Stacul F (2001) Present-day imaging of patients with renal colic. Eur Radiol 11:4–17
Coe FL, Evan A, Worcester E (2005) Kidney stone disease. J Clin Invest 115:2598–2608
Deveci S, Coşkun M, Tekin MI, Peşkircioglu L, Tarhan NC, Ozkardeş H (2004) Spiral computed tomography: role in determination of chemical compositions of pure and mixed urinary stones–an in vitro study. Urology 64:237–240
Mostafavi MR, Ernst RD, Saltzman B (1998) Accurate determination of chemical composition of urinary calculi by spiral computerized tomography. J Urol 159:673–675
Primak AN, Fletcher JG, Vrtiska TJ, Dzyubak OP, Lieske JC, Jackson ME, Williams JC, McCollough CH (2007) Noninvasive differentiation of uric acid versus non-uric acid kidney stones using dual-energy CT. Acad Radiol 14:1441–1447
Bellin M-F, Renard-Penna R, Conort P, Bissery A, Meric J-B, Daudon M, Mallet A, Richard F, Grenier P (2004) Helical CT evaluation of the chemical composition of urinary tract calculi with a discriminant analysis of CT-attenuation values and density. Eur Radiol 14:2134–2140
Hillman BJ, Drach GW, Tracey P, Gaines JA (1984) Computed tomographic analysis of renal calculi. AJR Am J Roentgenol 142:549–552
Nakada SY, Hoff DG, Attai S, Heisey D, Blankenbaker D, Pozniak M (2000) Determination of stone composition by noncontrast spiral computed tomography in the clinical setting. Urology 55:816–819
Williams JC, Saw KC, Paterson RF, Hatt EK, McAteer JA, Lingeman JE (2003) Variability of renal stone fragility in shock wave lithotripsy. Urology 61:1092–1096, discussion 1097
Ngo TC, Assimos DG (2007) Uric Acid nephrolithiasis: recent progress and future directions. Rev Urol 9:17–27
Liebman SE, Taylor JG, Bushinsky DA (2007) Uric acid nephrolithiasis. Curr Rheumatol Rep 9:251–257
Dalrymple NC, Verga M, Anderson KR, Bove P, Covey AM, Rosenfield AT, Smith RC (1998) The value of unenhanced helical computerized tomography in the management of acute flank pain. J Urol 159:735–740
Yilmaz S, Sindel T, Arslan G, Ozkaynak C, Karaali K, Kabaalioğlu A, Lüleci E (1998) Renal colic: comparison of spiral CT, US and IVU in the detection of ureteral calculi. Eur Radiol 8:212–217
Motley G, Dalrymple N, Keesling C, Fischer J, Harmon W (2001) Hounsfield unit density in the determination of urinary stone composition. Urology 58:170–173
Graser A, Johnson T, Bader M, Staehler M, Haseke N, Nikolaou K, Reiser MF, Stief CG, Becker CR (2008) Dual energy CT characterization of urinary calculi: initial in vitro and clinical experience. Invest Radiol 43:112–119
Engel KJ, Herrmann C, Zeitler G (2008) X-ray scattering in single- and dual-source CT. Med Phys 35:318–332
Grosjean R, Sauer B, Guerra RM, Daudon M, Blum A, Felblinger J, Hubert J (2008) Characterization of human renal stones with MDCT: advantage of dual energy and limitations due to respiratory motion. AJR 190:720–728
Brix G, Lechel U, Veit R, Truckenbrodt R, Stamm G, Coppenrath EM, Griebel J, Nagel H-D (2004) Assessment of a theoretical formalism for dose estimation in CT: an anthropomorphic phantom study. Eur Radiol 14:1275–1284
European Commission. European Guidelines on Quality Criteria for Computed Tomography, Report EUR 16262. Brussels: EC, 1999. p. 1-107
Reiser MF, Becker CR, Nikolaou K, Glazer G (eds) (2009) Multislice CT. Springer, Berlin
Krafft C, Steiner G, Beleites C, Salzer R (2009) Disease recognition by infrared and Raman spectroscopy. J Biophotonics 2:13–28
Ascenti G, Siragusa C, Racchiusa S, Ielo I, Privitera G, Midili F, Mazziotti S (2010) Stone-targeted dual-energy CT: a new diagnostic approach to urinary calculosis. Am J Roentgenol 195:953–958
Stolzmann P, Leschka S, Scheffel H, Rentsch K, Baumüller S, Desbiolles L, Schmidt B, Marincek B, Alkadhi H (2010) Characterization of urinary stones with dual-energy CT: improved differentiation using a tin filter. Invest Radiol 45:1
Thomas C, Patschan O, Ketelsen D, Tsiflikas I, Reimann A, Brodoefel H, Buchgeister M, Nagele U, Stenzl A et al (2009) Dual-energy CT for the characterization of urinary calculi: In vitro and in vivo evaluation of a low-dose scanning protocol. Eur Radiol 19:1553–1559
Stolzmann P, Scheffel H, Rentsch K, Schertler T, Frauenfelder T, Leschka S, Sulser T, Marincek B, Alkadhi H (2008) Dual-energy computed tomography for the differentiation of uric acid stones: ex vivo performance evaluation. Urol Res 36:133–138
Thomas C, Krauss B, Ketelsen D, Tsiflikas I, Reimann A, Werner M, Schilling D, Hennenlotter J, Claussen CD et al (2010) Differentiation of urinary calculi with dual energy CT: effect of spectral shaping by high energy tin filtration. Invest Radiol 45:393–398
Thomas C, Heuschmid M, Schilling D, Ketelsen D, Tsiflikas I, Stenzl A, Claussen CD, Schlemmer H-P (2010) Urinary calculi composed of uric acid, cystine, and mineral salts: differentiation with dual-energy CT at a radiation dose comparable to that of intravenous pyelography. Radiology 257:402–409
Boll DT, Patil NA, Paulson EK, Merkle EM, Simmons WN, Pierre SA, Preminger GM (2009) Renal stone assessment with dual-energy multidetector CT and advanced postprocessing techniques: improved characterization of renal stone composition–pilot study. Radiology 250:813–820
Matlaga BR, Kawamoto S, Fishman E (2008) Dual source computed tomography: a novel technique to determine stone composition. Urology 72:1164–1168
Hamm M, Wawroschek F, Weckermann D, Knöpfle E, Häckel T, Häuser H, Krawczak G, Harzmann R (2001) Unenhanced helical computed tomography in the evaluation of acute flank pain. Eur Urol 39:460–465
Hamm M, Knöpfle E, Wartenberg S, Wawroschek F, Weckermann D, Harzmann R (2002) Low-dose unenhanced helical computerized tomography for the evaluation of acute flank pain. J Urol 167:1687–1691
Ramello A, Vitale C, Marangella M (2000) Epidemiology of nephrolithiasis. J Nephrol 13(Suppl 3):S45–50
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Eiber, M., Holzapfel, K., Frimberger, M. et al. Targeted dual-energy single-source CT for characterisation of urinary calculi: experimental and clinical experience. Eur Radiol 22, 251–258 (2012). https://doi.org/10.1007/s00330-011-2231-2
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DOI: https://doi.org/10.1007/s00330-011-2231-2