Impact of iterative reconstruction on image quality and radiation dose in multidetector CT of large body size adults.
Eur Radiol
; 22(8): 1631-40, 2012 Aug.
Article
en En
| MEDLINE
| ID: mdl-22527370
ABSTRACT
OBJECTIVE:
To compare image quality and radiation dose using Adaptive Statistical Iterative Reconstruction (ASiR) and Filtered Back Projection (FBP) in patients weighing ≥ 91 kg.METHODS:
In this Institution Review Board-approved retrospective study, single-phase contrast-enhanced abdominopelvic CT examinations of 100 adults weighing ≥ 91 kg (mean body weight 107.6 ± 17.4 kg range 91-181.9 kg) with (1) ASiR and (2) FBP were reviewed by two readers in a blinded fashion for subjective measures of image quality (using a subjective standardized numerical scale and objective noise) and for radiation exposure. Imaging parameters and radiation dose results of the two techniques were compared within weight and BMI sub-categories.RESULTS:
All examinations were found to be of adequate quality. Both subjective (mean = 1.4 ± 0.5 vs. 1.6 ± 0.6, P < 0.05) and objective noise (13.0 ± 3.2 vs.19.5 ± 5.7, P < 0.0001) were lower with ASiR. Average radiation dose reduction of 31.5 % was achieved using ASiR (mean CTDIvol. ASiR 13.5 ± 7.3 mGy; FBP 19.7 ± 9.0 mGy, P < 0.0001). Other measures of image quality were comparable between the two techniques. Trends for all parameters were similar in patients across weight and BMI sub-categories.CONCLUSION:
In obese individuals, abdominal CT images reconstructed using ASiR provide diagnostic images with reduced image noise at lower radiation dose. KEY POINTS ⢠CT images in obese adults are noisy, even with high radiation dose. ⢠Newer iterative reconstruction techniques have theoretical advantages in obese patients. ⢠Adaptive statistical iterative reconstruction should reduce image noise and radiation dose. ⢠This has been proven in abdominopelvic CT images of obese patients.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Interpretación de Imagen Radiográfica Asistida por Computador
/
Tomografía Computarizada por Rayos X
Tipo de estudio:
Observational_studies
Límite:
Adult
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Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Eur Radiol
Asunto de la revista:
RADIOLOGIA
Año:
2012
Tipo del documento:
Article
País de afiliación:
Estados Unidos