Trade-off between the radiation parameters and image quality using iterative reconstruction techniques in head computed tomography: a phantom study.
Acta Radiol
; 64(9): 2618-2626, 2023 Sep.
Article
em En
| MEDLINE
| ID: mdl-37469141
ABSTRACT
BACKGROUND:
Iterative reconstruction techniques (IRTs) are commonly used in computed tomography (CT) and help to reduce image noise.PURPOSE:
To determine the minimum radiation dose while preserving image quality in head CT using IRTs. MATERIAL ANDMETHODS:
The anthropomorphic phantom was used to scan nine head CT image series with varied radiation parameters. CT dose parameters, including volume CT dose index (CTDIvol [in mGy]) and dose length product (DLP [in mGy/cm]), were recorded for each scan series. Different noise levels (iDoseL1-6) were used in IRT reconstructions for soft and bone tissues. In total, 15 measurements were taken from five regions of interest (ROI) with an area of 10 mm2. The signal-to-noise ratio (SNR) and noise values obtained at different ROIs were compared among various reconstruction methods with repeated measures of statistical analysis.RESULTS:
In the head CT scan, applying IRT iDoseL5 had the lowest noise and highest SNR for soft tissue (P < 0.05), and increased iDose can decrease CT dose by 54.6% without compromising image quality. While for bone tissue reconstruction, no clear association was found between the level of iDose and noise. However, when CTDIvol is >20 mGy, iDoseL4 is slightly superior to other reconstruction methods (P < 0.065).CONCLUSION:
Using IRTs in head CTs reduces radiation dose while maintaining image quality. IDoseL5 provided optimal balance for soft tissue.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Interpretação de Imagem Radiográfica Assistida por Computador
/
Tomografia Computadorizada por Raios X
Limite:
Humans
Idioma:
En
Revista:
Acta Radiol
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
Letônia