Abstract
The aim of this study was to reduce radiation exposure in multislice CT (MSCT) coronary artery calcium screening using different tube settings, and to determinate its impact on the detection and quantification of coronary artery calcification. Forty-eight patients underwent routine MSCT coronary artery calcium scoring (Somatom VolumeZoom, Siemens, Forchheim, Germany) with retrospective ECG-gated data acquisition. Scanning was performed with a 4×2.5-mm collimation. In each patient data acquisition was performed twice using tube settings of 120 kVp with 133 mAs (protocol 1) and of 80 kVp with 300 mAs (protocol 2). Together with the 80-kVp protocol additional online ECG-related tube current modulation (ECG pulsing) was used. Three-millimeter overlapping slices (increment 1.5 mm) were calculated for each data set. Semi-automated calcium quantification was performed calculating absolute Ca-hydroxylapatite mass. In addition to patient examinations, the radiation exposure for both protocols was evaluated using computed tomography dose index (CTDI) phantom measurements. Protocol 2 showed a significantly lower patient radiation exposure than protocol 1 (0.72 vs 2.04 mSv; p<0.0001). The CTDI phantom measurements revealed a 65% reduction of radiation dose. Calcium scoring results of both protocols showed a high correlation (r=0.99; p<0.0001) for absolute Ca-Hydroxylapatite mass measurements. Using 80-kVp protocols patient radiation exposure can be significantly reduced in MSCT coronary artery calcium screening without affecting the detection and quantification of coronary artery calcification; therefore, this technique should be used with retrospective ECG-gated cardiac CT examinations in patients with regular sinus rhythm.
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References
Friedewald ST, Wyngaarden JB, Smith LH (eds) (1988) Cecil's textbook of medicine, 18th edn. Saunders, Philadelphia, pp 179–183
Tunstall-Pedoe H, Kuulasmaa K, Mahonen M, Tolonen H, Ruokokoski E, Amouyel P (1999) Contribution of trends in survival and coronary-event rates to changes in coronary heart disease mortality: 10-year results from 37 WHO MONICA project populations. Monitoring trends and determinants in cardiovascular disease. Lancet 353:1547–1557
O'Malley P, Taylor A, Gibbons R et al. (1999) Rationale and design of the prospective army coronary calcium (PACC) study: utility of electron-beam computed tomography as a screening test for coronary artery disease and as an intervention for risk factor modification amoung young, asymptomatic, active-duty United States Army personal. Am Heart J 137:932–941
National Institutes of Health (2000) NHLBI launches 10-year study on early detection of heart disease. National Heart, Lung and Blood Institute, http://www.nhlbi.nih.gov/new/press/sep14–00.htm
Laudon DA, Vukov LF, Breen JF, Rumberger JA, Wollan PC, Sheedy PF (1999) Use of electron-beam computed tomography in the evaluation of chest pain patients in the emergency department. Ann Emerg Med 33:15–21
Wexler L, Brundage B, Crouse J et al. (1996) Coronary artery calcification: pathophysiology, epidemiology, imaging methods and clinical implications. A statement for health professionals from the American Heart Association Writing Group. Circulation 94:1175–1192
Callister TQ, Raggi P, Cooli B, Lippolis NJ, Russo DJ (1998) Effect of HMG-CoA reductase inhibitors on coronary artery disease as assessed by electron-beam computed tomography. N Engl J Med 339:1972–1978
Becker C, Jakobs T, Aydemir S et al. (2000) Helical and single-slice conventional versus electron beam CT for quantification of coronary artery calcification. AJR 174:543–547
Becker C, Kleffel T, Crispin A et al. (2001) Coronary artery calcium measurement: agreement of multirow detector and electron beam CT. AJR 176:1295–1298
Ohnesorge B, Flohr T, Becker CR et al. (2000) Cardiac imaging by means of electrocardiographically gated multisection spiral CT: initial experience. Radiology 217:564–571
Becker C, Schätzl M, Feist H et al. (1999) Assessment of the effective dose for routine protocols in conventional CT, electron beam CT and coronary angiography. RoFo Fortschr Geb Rontgenstr Neuen Bildgeb Verfahr 170:90–104
Ohnesorge B, Flohr T, Fischbach R, Kopp AF, Knez A, Schröder S, Schöpf UJ, Crispin A, Klotz E, Reiser MF, Becker CR (2002) Reproducibility of coronary calcium quantification in repeat examinations with retrospectively ECG-gated multisection spiral CT. Eur Radiol 12:1532–1540
Huda W, Scalzetti EM, Levin G (2000) Technique factors and image quality as functions of patient weight at abdominal CT. Radiology 217:430–435
Jakobs TF, Becker CR, Ohnesorge B, Flohr T, Suess C, Schoepf UJ, Reiser MF (2002) Multislice helical CT of the heart with retrospective ECG gating: reduction of radiation exposure by ECG-controlled tube current modulation. Eur Radiol 12:1081–1086
Ohnesorge B, Flohr T, Becker CR, Kopp AF, Knez A, Reiser MF (2000) Dose evaluation and dose reduction strategies for ECG-gated multislice spiral CT of the heart. Radiology 217:487
Bongartz G, Golding SJ, Jurik AG, Leonardi M, van Meerten EvP, Geleijns J, Jessen KA, Panzer W, Shrimpton PC, Tosi G (1999) European guidelines on quality criteria for computed tomography. Report EUR 16262 EN, http://www.drs.dk/guidelines/ct/quality/default.htm, ISBN 92-828-7478-8
Becker CR, Schoepf UJ, Reiser MF (2003) Coronary artery calcium scoring: medicine and politics. Eur Radiol 13:445–447
Hong C, Bae KT et al. (2002) Coronary artery calcium measurement with multi-detector row CT: in vitro assessment of effect of radiation dose. Radiology 225:901–906
Ulzheimer S, Kalender WA (2003) Assessment of calcium scoring performance in cardiac computed tomography. Eur Radiol 13:484–497
Klingenbeck K, Schaller S, Flohr T, Ohnesorge B, Kopp AF, Baum U (1999) Subsecond multislice computed tomography: basics and applications. Eur J Radiol 31:110–124
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Jakobs, T.F., Wintersperger, B.J., Herzog, P. et al. Ultra-low-dose coronary artery calcium screening using multislice CT with retrospective ECG gating. Eur Radiol 13, 1923–1930 (2003). https://doi.org/10.1007/s00330-003-1895-7
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DOI: https://doi.org/10.1007/s00330-003-1895-7