Breast dose reduction for chest CT by modifying the scanning parameters based on the pre-scan size-specific dose estimate (SSDE).
Eur Radiol
; 27(6): 2267-2274, 2017 Jun.
Article
em En
| MEDLINE
| ID: mdl-27718079
ABSTRACT
OBJECTIVE:
To investigate the usefulness of modifying scanning parameters based on the size-specific dose estimate (SSDE) for a breast-dose reduction for chest CT. MATERIALS ANDMETHODS:
We scanned 26 women with a fixed volume CT dose index (CTDIvol) (15 mGy) and another 26 with a fixed SSDE (15 mGy) protocol (protocol 1 and 2, respectively). In protocol 2, tube current was calculated based on the patient habitus obtained on scout images. We compared the mean breast dose and the inter-patient breast dose variability and performed linear regression analysis of the breast dose and the body mass index (BMI) of the two protocols.RESULTS:
The mean breast dose was about 35 % lower under protocol 2 than protocol 1 (10.9 mGy vs. 16.8 mGy, p < 0.01). The inter-patient breast dose variability was significantly lower under protocol 2 than 1 (1.2 mGy vs. 2.5 mGy, p < 0.01). We observed a moderate negative correlation between the breast dose and the BMI under protocol 1 (r = 0.43, p < 0.01); there was no significant correlation (r = 0.06, p = 0.35) under protocol 2.CONCLUSION:
The SSDE-based protocol achieved a reduction in breast dose and in inter-patient breast dose variability. KEY POINTS ⢠CT scan parameters can be modified based on the pre-scan SSDE. ⢠The pre-scan SSDE is useful for a breast dose reduction. ⢠The fixed SSDE protocol reduced individual variations in the breast dose.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Mama
/
Radiografia Torácica
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article