Size-specific dose estimates for pediatric head CT protocols based on the AAPM report TG-293.
Phys Med
; 100: 26-30, 2022 Aug.
Article
em En
| MEDLINE
| ID: mdl-35717776
ABSTRACT
PURPOSE:
To establish the Size Specific Dose Estimate (SSDE) typical values for pediatric head CT examinations based on the AAPM report TG-293; to provide a new stratification based on the water-equivalent diameter (Dw), given that SSDE is related to the head size.METHODS:
296 Head CT scans of pediatric patients collected using a dose monitoring software were retrospectively analysed. Typical values were derived stratifying data by age in threemethods:
the first proposed by the European Guidelines on Diagnostic Reference Levels for Pediatric Imaging (RP185), the second by the National Istisan Report 20/22 and a local one related to the clinical protocols (LStrata). For each scan, a self-developed Matlab routine calculated the water-equivalent diameter (Dw) and related SSDE values with the conversion factors fH16and fB16provided by the AAPM reports TG-293 and TG-204, respectively. Eventually, a Dwstratification was introduced starting from a measure of the lateral dimension of the head.RESULTS:
SSDE based on TG-204 overestimatesthe dose up to 12%. Four Dwgroups were identified thanks to the good correlation between the head lateral dimension andDw Dw < 14 cm, 14 ≤ Dw < 16 cm, 16 ≤ Dw< 17 cm, Dw≥ 17 cm. The Dw-stratified dosimetric indices presentgreater variability than those grouped by age because of the large variability of the size of the infant's head.CONCLUSIONS:
The variability of the SSDE metric underlines that age-optimized protocols are not when size is considered.Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Tomografia Computadorizada por Raios X
/
Cabeça
Tipo de estudo:
Guideline
/
Observational_studies
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Prognostic_studies
Limite:
Child
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Humans
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Infant
Idioma:
En
Revista:
Phys Med
Assunto da revista:
BIOFISICA
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BIOLOGIA
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MEDICINA
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Itália