(Sunday, 7/14/2019)
Room: ePoster Forums
Purpose: Radiation dose to patients undergoing examinations with automatic tube-current modulation (ATCM) is a matter of concern. The purpose of this study was to retrospectively assess the amount of radiation (mAs�CTDIvol�DLP�SSDE and organ dose) associated in chest computed tomography (CT) scans.
Methods: The study performed on a cohort of 159 patients receiving chest CT scans. The water equivalent diameter (Dw) was calculated based on the measured parameters from the mid-chest image series and patients whose Dw values were below the 25th percentile of the Dw distribution were considered to be small (< 22cm). Patients with Dw values ranging from the 25th percentile to the 75th percentile were considered to be medium (22–25cm). Patients above the 75th percentile were classified as large (> 25cm). Radiation output of mAs�CTDIvol�DLP were got from the DICOM tags of each patient CT images. Patient organ doses (lungs�breasts�heart) were simulated with the Monte Carlo method, and the results then corrected using the water-equivalent diameter (Dw) and tube-current time for each patient.
Results: Radiation output of mAs�CTDIvol�DLP�SSDE�organ doses increase with patient size and significant differences (P < .001) were found among different-sized patients.
Conclusion: mAs�CTDIvol�DLP actually only represents the output of the scanner, and SSDE take into account patient-associated parameters body size but cannot indicate radiation of each organ. Organ dose that combine mAs and patient size could be the best parameter to evaluate the amount of radiation.
Funding Support, Disclosures, and Conflict of Interest: This work was supported by the Natural Science Foundation of China (grant number 11475047)
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