Attenuation-Based Automatic Kilovoltage Selection and Sinogram-Affirmed Iterative Reconstruction: Effects on Radiation Exposure and Image Quality of Portal-Phase Liver CT
Korean Journal of Radiology
; : 69-79, 2015.
Article
en En
| WPRIM
| ID: wpr-157427
Biblioteca responsable:
WPRO
ABSTRACT
OBJECTIVE: To compare the radiation dose and image quality between standard-dose CT and a low-dose CT obtained with the combined use of an attenuation-based automatic kilovoltage (kV) selection tool (CARE kV) and sinogram-affirmed iterative reconstruction (SAFIRE) for contrast-enhanced CT examination of the liver. MATERIALS AND METHODS: We retrospectively reviewed 67 patients with chronic liver disease in whom both, standard-dose CT with 64-slice multidetector-row CT (MDCT) (protocol A), and low-dose CT with 128-slice MDCT using CARE kV and SAFIRE (protocol B) were performed. Images from protocol B during the portal phase were reconstructed using either filtered back projection or SAFIRE with 5 different iterative reconstruction (IR) strengths. We performed qualitative and quantitative analyses to select the appropriate IR strength. Reconstructed images were then qualitatively and quantitatively compared with protocol A images. RESULTS: Qualitative and quantitative analysis of protocol B demonstrated that SAFIRE level 2 (S2) was most appropriate in our study. Qualitative and quantitative analysis comparing S2 images from protocol B with images from protocol A, showed overall good diagnostic confidence of S2 images despite a significant radiation dose reduction (47% dose reduction, p < 0.001). CONCLUSION: Combined use of CARE kV and SAFIRE allowed significant reduction in radiation exposure while maintaining image quality in contrast-enhanced liver CT.
Palabras clave
Texto completo:
1
Índice:
WPRIM
Asunto principal:
Dosis de Radiación
/
Estatura
/
Peso Corporal
/
Interpretación de Imagen Radiográfica Asistida por Computador
/
Tomografía Computarizada por Rayos X
/
Índice de Masa Corporal
/
Enfermedad Crónica
/
Estudios Retrospectivos
/
Medios de Contraste
/
Hígado
Tipo de estudio:
Guideline
/
Observational_studies
/
Qualitative_research
Límite:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Korean Journal of Radiology
Año:
2015
Tipo del documento:
Article