Página 238 - irpa

238 ST 3.2 – Protección radiológica en radiodiagnóstico
(orientada a la tomografía computada)
ASSESSMENT OF ORGAN DOSE IN PEDIATRIC PATIENTS UNDERGOING
CT EXAM
Porto, Lorena1; Paschuk, Sergei 1; Schelin, Hugo2 *;
Filipov, Danielle2 ; Denyak, Valeriy2; Ledesma, Jorge2;
Legnani, Adriano2 ; Andrade, Marcos3 ; Khoury, Helen3
1 Federal University of Technology. Brasil.
2 Pelé Pequeno Príncipe Research Institute. Brasil.
3 Federal University of Pernambuco. Brasil.
* Responsible author, email: schelin2@gmail.com
Pediatric CT dosimetry has been a matter of great study lately in the scientific community
because the dose is higher than in most of the radiographic procedures. This study was
performed at the Little Prince Children’s Hospital in Curitiba-Brazil, using a GE fifth-generation
CT scanner, model BrightSpeed. Data were collected from 724 patients divided into 5 age
groups, 0 year, 1 year, 2-5 years, 6-10 years and 11-16 years, according to the
recommendation ofthe European Commission. The dose for different ages was analyzed and
compared with international protocols regarding the CTDIvol, DLP and organ dose for a cranial,
abdomen and chest CT. The dose values were collected from the equipment. The results
obtained were compared with computer analysis values. They were used in this study to
calculate the organ dose and to compare with the reference dose levels established by the
European Community. Using the computer simulation program of the Caldose group and the
EUR MSCT protocols, the relevant radioprotection magnitudes to the study, which are the organ
dose values related to the procedure, were determined. The level of dose length product (DLP) ,
using the CTDI100, air previously established, was also obtained and compared with the dose
reference level established by the European Community and the Good Practice Guide from the
UK. The CTDIvol values are in the range of 1.37 to 6.08 mGy, the DLP values are between
19.71 and 279.12 mGy.cm. The values found so far are within the limits of the reference levels.
Work supported by CNPq, CAPES and Fundação Araucária.