PURPOSE: This study evaluated the effectiveness of patient dose reduction tools on a 256-slice computed tomography scanner (Brilliance iCT, Philips). MATERIALS AND METHODS: The performance of the Brilliance iCT scanner was described in terms of cumulative dose and dose-normalised contrast-to-noise ratio (CNRD). The efficiency of automatic tube current modulation (Z-Dom and D-Dom), shaping filters (SmartShape and IntelliBeam) and asymmetric collimator (Eclipse) was evaluated using appropriate phantoms. RESULTS: The scattered radiation contribution from the peripheral regions to the cumulative dose is not negligible. The CNRD is 20 % better compared to a traditional 16-slice scanner, with a dose reduction of 40 %. The application of shaping filters decreases the dose in the peripheral regions. The application of D-Dom and Z-Dom modulations reduces the current-time product (mAs) values by 23 and 18 %, respectively, but they are not yet integrated. The over-ranging effect is not negligible, despite the use of an Eclipse asymmetric collimator. CONCLUSIONS: Brilliance iCT dose reduction tools are efficient, but should be analysed carefully and used correctly.
PURPOSE: This study evaluated the effectiveness of patient dose reduction tools on a 256-slice computed tomography scanner (Brilliance iCT, Philips). MATERIALS AND METHODS: The performance of the Brilliance iCT scanner was described in terms of cumulative dose and dose-normalised contrast-to-noise ratio (CNRD). The efficiency of automatic tube current modulation (Z-Dom and D-Dom), shaping filters (SmartShape and IntelliBeam) and asymmetric collimator (Eclipse) was evaluated using appropriate phantoms. RESULTS: The scattered radiation contribution from the peripheral regions to the cumulative dose is not negligible. The CNRD is 20 % better compared to a traditional 16-slice scanner, with a dose reduction of 40 %. The application of shaping filters decreases the dose in the peripheral regions. The application of D-Dom and Z-Dom modulations reduces the current-time product (mAs) values by 23 and 18 %, respectively, but they are not yet integrated. The over-ranging effect is not negligible, despite the use of an Eclipse asymmetric collimator. CONCLUSIONS: Brilliance iCT dose reduction tools are efficient, but should be analysed carefully and used correctly.
Authors: Kostas Perisinakis; Ioannis Seimenis; Antonis Tzedakis; Antonios E Papadakis; John Damilakis Journal: Med Phys Date: 2013-01 Impact factor: 4.071
Authors: Amy Berrington de González; Mahadevappa Mahesh; Kwang-Pyo Kim; Mythreyi Bhargavan; Rebecca Lewis; Fred Mettler; Charles Land Journal: Arch Intern Med Date: 2009-12-14