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Dose assessment in pediatric computerized tomography; Avaliacao de doses em tomografia computadorizada pediatrica

Abstract

The objective of this work was the evaluation of radiation doses in paediatric computed tomography scans, considering the high doses usually involved and the absence of any previous evaluation in Brazil. Dose values were determined for skull and abdomen examinations, for different age ranges, by using the radiographic techniques routinely used in the clinical centers investigated. Measurements were done using pencil shape ionization chambers inserted in polymethylmethacrylate (PMMA) phantoms. These were compact phantoms of different diameters were specially designed and constructed for this work, which simulate different age ranges. Comparison of results with published values showed that doses were lower than the diagnostic reference levels established to adults exams by the European Commission. Nevertheless, doses in paediatric phantoms were higher than those obtained in adult phantoms. The paediatric dose values obtained in Hospitals A and B were lower than the reference level (DRL) adopted by SHIMPTON for different age ranges. In the range 0 - 0.5 year (neonatal), the values of DLP in Hospital B were 94 por cent superior to the DRL For the 10 years old children the values of CTDI{sub w} obtained were inferior in 89 por cent for skull and 83 por cent for abdomen examinations,  More>>
Publication Date:
Jul 01, 2004
Product Type:
Thesis/Dissertation
Report Number:
INIS-BR-4652
Resource Relation:
Other Information: TH: Diss. (M.Sc.); 58 refs., 41 figs., 19 tabs
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; ABDOMEN; BIOLOGICAL RADIATION EFFECTS; BIOMEDICAL RADIOGRAPHY; CHILDREN; COMPUTERIZED TOMOGRAPHY; CRITICAL ORGANS; DOSE RATES; DOSIMETRY; GASTROINTESTINAL TRACT; IMAGE PROCESSING; IMAGE SCANNERS; IONIZATION; PEDIATRICS; RADIATION DOSES; RADIATION EFFECTS; RADIATION PROTECTION; RADIATIONS; SKULL
OSTI ID:
21096995
Research Organizations:
Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
TRN: BR08V3384107627
Availability:
Available from INIS in electronic form
Submitting Site:
BRN
Size:
91 pages
Announcement Date:
Dec 05, 2008

Citation Formats

Vilarinho, Luisa Maria Auredine Lima. Dose assessment in pediatric computerized tomography; Avaliacao de doses em tomografia computadorizada pediatrica. Brazil: N. p., 2004. Web.
Vilarinho, Luisa Maria Auredine Lima. Dose assessment in pediatric computerized tomography; Avaliacao de doses em tomografia computadorizada pediatrica. Brazil.
Vilarinho, Luisa Maria Auredine Lima. 2004. "Dose assessment in pediatric computerized tomography; Avaliacao de doses em tomografia computadorizada pediatrica." Brazil.
@misc{etde_21096995,
title = {Dose assessment in pediatric computerized tomography; Avaliacao de doses em tomografia computadorizada pediatrica}
author = {Vilarinho, Luisa Maria Auredine Lima}
abstractNote = {The objective of this work was the evaluation of radiation doses in paediatric computed tomography scans, considering the high doses usually involved and the absence of any previous evaluation in Brazil. Dose values were determined for skull and abdomen examinations, for different age ranges, by using the radiographic techniques routinely used in the clinical centers investigated. Measurements were done using pencil shape ionization chambers inserted in polymethylmethacrylate (PMMA) phantoms. These were compact phantoms of different diameters were specially designed and constructed for this work, which simulate different age ranges. Comparison of results with published values showed that doses were lower than the diagnostic reference levels established to adults exams by the European Commission. Nevertheless, doses in paediatric phantoms were higher than those obtained in adult phantoms. The paediatric dose values obtained in Hospitals A and B were lower than the reference level (DRL) adopted by SHIMPTON for different age ranges. In the range 0 - 0.5 year (neonatal), the values of DLP in Hospital B were 94 por cent superior to the DRL For the 10 years old children the values of CTDI{sub w} obtained were inferior in 89 por cent for skull and 83 por cent for abdomen examinations, compared to the values published by SHRIMPTON and WALL. Our measured CTDI{sub w} values were inferior to the values presented for SHRIMPTON and HUDA, for all the age ranges and types of examinations. It was observed that the normalized dose descriptors values in children in the neonatal range were always superior to the values of doses for the adult patient. In abdomen examinations, the difference was approximately 90% for the effective dose (E) and of 57%.for CTDI{sub w} . (author)}
place = {Brazil}
year = {2004}
month = {Jul}
}