During the last decades, the growth in use of medical imaging examinations has led to a significant interest on radiation dose delivered to patients. Computed Tomography (CT) examinations have been identified as the largest source of medical radiation exposure both in Europe and in United States [1-3]. The main technological advance in CT introduced in the last years has been represented by the multislice scanners (MSCT), which have contributed to faster acquisition of large anatomical regions limiting the rate of failure of adequate image acquisition....

The present work relies on dosimetric approach validated in a previous publication [13], where a method enabling the direct measurement of CTDIvol and DLP for helical CT scans has been reported. This methodology involves the use of a measuring system suspended at the CT isocenter and uncoupled to the couch displacement. The measuring system does not shift with the table, but is suspended at the CT isocenter and free from table movement. During the scan, the beam is oriented towards the ionization chamber center for...

In the present study, a method for assessing DLPOV in helical scans has been theoretically described and experimentally validated. It has been demonstrated that overscan is responsible from approximately 38% to 5% of the displayed DLP values for minimum and maximum planned scan lengths investigated in this study. One advantage of the proposed methodology is its complete independence from console readings. However, the proposed methodology proposes a calculation based on set parameters and on measurement of scan time derived from waveform acquisitions instead of relying...

Mariaconcetta Longo Risk Management and Technology Assessment/Medical Physics IRCCS Bambino Gesù Children Hospital P.zza S. Onofrio, 4 - 00165 Rome (Italy) Tel.: +39 06 68592568 Fax : +39 06 68593856 e-mail: [email protected]

[1] International Commission on Radiological Protection, Managing Patient Dose in Computed Tomography, ICRP Publication 87, Ann. ICRP 30 (4), 2000. [2] United Nations Scientific Committee on the Effects of Atomic Radiation, Source and effects of ionizing radiations, UNSCEAR 2008 Report to the General Assembly with Scientific Annexes, Volume I. [3] Communicating radiation risks in paediatric imaging, Information to support healthcare discussions about benefit and risk, World Health Organization 2016. [4] AJ van der Molen, J Geleijns, Overranging in Multisection CT: Quantification and Relative Contribution to...