Digital Tomosynthesis of the Chest: Comparison of Patient Exposure Dose and Image Quality between Standard Default Setting and Low Dose Setting
Korean Journal of Radiology
;
: 525-531, 2013.
Artigo
em Inglês
| WPRIM
| ID: wpr-208252
ABSTRACT
OBJECTIVE:
To determine the optimum low dose (LD) digital tomosynthesis (DT) setting, and to compared the image quality of the LD DT with that of the standard default (SD) DT. MATERIALS ANDMETHODS:
Nine DT settings, by changing tube voltage, copper filter, and dose ratio, were performed for determining the LD setting. Among combinations of DT setting, a condition providing the lowest radiation dose was determined. Eighty artificial nodules less than 1 cm in diameter (subcentimeter nodules 40, micronodules less than 4 mm 40) were attached to a Styrofoam and a diaphragm of the phantom. Among these, 38 nodules were located at the periphery of the lung (thin area) and 42 nodules were located at the paravertebral or sub-diaphragmatic area (thick area). Four observers counted the number of nodules detected in the thick and thin areas. The detection sensitivity in SD and LD settings were calculated separately. Data were analyzed statistically.RESULTS:
The lowest LD setting was a combination of 100 kVp, 0.3 mm additional copper filter, and a 1 5 dose ratio. The effective dose for the LD and SD settings were 62 microSv and 140 microSv, separately. A 56.7% dose reduction was achieved in the LD setting compared with the SD setting. Detection sensitivities were not different between the SD and the LD settings except between observers 1 and 2 for the detection of micronodules in the thick area.CONCLUSION:
LD DT can be effective in nodule detection bigger than 4 mm without a significant decrease in image quality compared with SD DT.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Doses de Radiação
/
Intensificação de Imagem Radiográfica
/
Diagnóstico por Computador
/
Sensibilidade e Especificidade
/
Nódulo Pulmonar Solitário
/
Imagens de Fantasmas
/
Neoplasias Pulmonares
Tipo de estudo:
Estudo diagnóstico
Limite:
Humanos
Idioma:
Inglês
Revista:
Korean Journal of Radiology
Ano de publicação:
2013
Tipo de documento:
Artigo
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