Pediatric chest CT at 70 kVp: a feasibility study in 129 children.
Pediatr Radiol
; 44(11): 1347-57, 2014 Nov.
Article
em En
| MEDLINE
| ID: mdl-24925355
ABSTRACT
BACKGROUND:
Before introducing 70-kVp settings in the low-kilovoltage strategies for pediatric examinations, it was mandatory to demonstrate, at similar dose levels, an equivalence of image quality at 70 kVp and 80 kVp.OBJECTIVE:
To assess image quality of chest CT examinations acquired at 70 kVp in comparison with standard scanning at 80 kVp. MATERIALS ANDMETHODS:
We prospectively evaluated 129 children with a 70-kVp scanning protocol (group 1). All scanning parameters were kept similar to those usually selected for pediatric standard 80-kVp protocols, except the milliamperage increased by a factor of 1.6 to maintain comparable radiation dose. Image quality of group 1 examinations was compared to that of a paired population scanned at 80 kVp (group 2). The noninferiority hypothesis was fixed at 10% of the mean level of image noise.RESULTS:
There was no significant difference in the mean dose length product (DLP) and the volume computed tomography dose index (CTDIvol) between the groups (DLP 20.5 ± 5.8 mGy.cm [group 1] vs. 19.7 ± 7.6 mGy.cm [group 2]; P = 0.06) (CTDIvol 0.8 ± 0.1 mGy [group 1] vs. 0.8 ± 0.18 mGy [group 2]; P = 0.94). The mean of differences in image noise between group 1 and group 2 examinations was -1.38 (-2.59; -0.18), verifying the noninferiority hypothesis. Subjective image quality did not significantly differ between group 1 and group 2 examinations (P = 0.18).CONCLUSION:
At equivalent radiation dose levels, 70-kVp protocols provide similar image quality to that achievable at 80 kVp.
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Base de dados:
MEDLINE
Assunto principal:
Doses de Radiação
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Proteção Radiológica
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Radiografia Torácica
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Tomografia Computadorizada por Raios X
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article