Investigation of the dosimetry of chest tomosynthesis

Angelica Svalkvist; Sara Zachrisson; Lars Gunnar Månsson; Magnus Båth

doi:10.1117/12.810256

13 March 2009 Investigation of the dosimetry of chest tomosynthesis

Angelica Svalkvist, Sara Zachrisson, Lars Gunnar Månsson, Magnus Båth

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72585X (2009) https://doi.org/10.1117/12.810256
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

Chest tomosynthesis has recently been introduced to healthcare as a low-dose alternative to CT or as a tool for improved diagnostics in chest radiography with only a modest increase in radiation dose to the patient. However, no detailed description of the dosimetry for this type of examination has been presented. The aim of this work was therefore to investigate the dosimetry of chest tomosynthesis. The chest tomosynthesis examination was assumed to be performed using a stationary detector and a vertically moving x-ray tube, exposing the patient from different angles. The Monte Carlo based computer software PCXMC was used to determine the effective dose delivered to a standard-sized patient from various angles using different assumptions of the distribution of the effective dose over the different projections. The obtained conversion factors between input dose measures and effective dose for chest tomosynthesis for different angular intervals were then compared with the horizontal projection. The results indicate that the error introduced by using conversion factors for the PA projection in chest radiography for estimating the effective dose of chest tomosynthesis is small for normally sized patients, especially if a conversion factor between KAP and effective dose is used.

Citation Download Citation

Angelica Svalkvist, Sara Zachrisson, Lars Gunnar Månsson, and Magnus Båth "Investigation of the dosimetry of chest tomosynthesis", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72585X (13 March 2009); https://doi.org/10.1117/12.810256

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