Program Information
Computed Tomography in Pediatrics: A Comparison of Head and Abdomen Imaging Acquisition Parameters and Dose Indicators
G Souza1 , J Real2 , A Froner1 , R Thomaz3*, A Marques da Silva1 (1) NIMed, PUCRS, Rio Grande do Sul, Porto Alegre, Brazil (2) HSL, PUCRS, Rio Grande do Sul, Porto Alegre, Brazil, (3) NANOPUC, PUCRS, Rio Grande do Sul, Porto Alegre, Brazil
Presentations
MO-RPM-GePD-I-2 (Monday, July 31, 2017) 3:45 PM - 4:15 PM Room: Imaging ePoster Lounge
Purpose: This study aims to compare image acquisition parameters in computed tomography (CT) scans and dose index used within a large hospital with those described in the literature for pediatric patients.
Methods: A survey of the image acquisition parameters and dose index CTDIvol was carried out for head and abdomen protocols used for pediatric patients for a Philips CT scanner Ingenuity Core CT 64. The data extracted were: tube voltage (kV), tube current (mA), rotation time (s), pitch, collimation (mm) and CTDIvol (mGy). The values were compared with literature recommendations of CT parameters for pediatric patients, for different age groups.
Results: The CT head acquisition protocol used for pediatric patients was: 100 kV, 100 mA, 0.4 s, pitch of 0.297, collimation of 64x0.625 mm, and CTDIvol of 27.6 mGy. The CT abdomen acquisition protocol used for pediatric patients was: 100 kV, 414 mA, rotation time of 0.4, pitch of 1.390, and collimation of 64x0.625 mm and CTDIvol of 4.9 mGy. For pediatric head CT, the CTDIvol was 36% higher than Mahrooqi (2015) review results for 6-10 years-old children. Compared with AAPM values for the most similar model/manufacturer (Philips CT Ingenuity CT 16) in the same age group, all the parameters were lower, with a 30% reduction of CTDIvol. For the pediatric abdomen CT, CTDIvol was 40% above the values described by Mahrooqi (2015), and 65% below the values described by Morgan (2002) for 2-10 kg children.
Conclusion: CT acquisition parameters for head and abdomen and dose index for pediatric patients were higher than the most recent literature recommendations, requiring optimization adjustments. The study shows that the comparison with older models can lead to wrong interpretation of the data.
Funding Support, Disclosures, and Conflict of Interest: Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (Fapergs)
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