Reducing the radiation dose for computed tomography colonography using model-based iterative reconstruction.
Abdom Imaging
; 40(5): 1183-9, 2015 Jun.
Article
em En
| MEDLINE
| ID: mdl-25331565
ABSTRACT
PURPOSE:
To determine whether radiation doses during computed tomography (CT) colonography (CTC) can be further reduced while maintaining image quality using model-based iterative reconstruction (MBIR).METHODS:
Twenty patients underwent CTC at a standard dose in supine and prone positions and at a reduced dose in the supine position. All other scan parameters (except noise index) were held constant. Acquisitions were reconstructed using 3 algorithms filtered back projection (FBP), adaptive statistical iterative reconstruction (ASIR), and MBIR. Noise was assessed quantitatively by comparing the SD in Hounsfield units at 5 standard locations. Qualitative assessment was made by 2 experienced radiologists blinded to technique who subjectively scored image quality, noise, and sharpness (from 0 to 4).RESULTS:
The standard-dose and reduced-dose CT dose index/dose-length product were 6.7/328 and 2.7 mGy/129 mGy-cm, respectively (60% reduction). Measured mean noise level increased from the standard to the reduced dose (FBP, from 58.6 to 97.2; ASIR from 35.8 to 60.6; and MBIR from 16.6 to 21.9). MBIR had significantly less noise than ASIR on 2-dimensional images at both standard and reduced doses (P < .01).CONCLUSIONS:
Radiation dose in CTC using MBIR can be reduced by 60% while maintaining image quality and reducing image noise.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias do Colo
/
Colonografia Tomográfica Computadorizada
Tipo de estudo:
Prognostic_studies
/
Qualitative_research
/
Screening_studies
Limite:
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Abdom Imaging
Assunto da revista:
DIAGNOSTICO POR IMAGEM
/
GASTROENTEROLOGIA
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Estados Unidos