Size-Specific Dose Estimation In the Korean Lung Cancer Screening Project: Does a 32-cm Diameter Phantom Represent a Standard-Sized Patient in Korean Population?
Korean Journal of Radiology
;
: 1179-1186, 2018.
Artigo
em Inglês
| WPRIM
| ID: wpr-718932
ABSTRACT
OBJECTIVE:
The purposes of this study were to evaluate size-specific dose estimate (SSDE) of low-dose CT (LDCT) in the Korean Lung Cancer Screening (K-LUCAS) project and to determine whether CT protocols from Western countries are appropriate for lung cancer screening in Korea. MATERIALS ANDMETHODS:
For participants (n = 256, four institutions) of K-LUCAS pilot study, volume CT dose index (CTDI(vol)) using a 32-cm diameter reference phantom was compared with SSDE, which was recalculated from CTDI(vol) using size-dependent conversion factor (f-size) based on the body size, as described in the American Association of Physicists in Medicine Report 204. This comparison was subsequently assessed by body mass index (BMI) levels (underweight/normal vs. overweight/obese), and automatic exposure control (AEC) adaptation (yes/no).RESULTS:
Size-specific dose estimate was higher than CTDI(vol) (2.22 ± 0.75 mGy vs. 1.67 ± 0.60 mGy, p < 0.001), since the f-size was larger than 1.0 for all participants. The ratio of SSDE to CTDI(vol) was higher in lower BMI groups; 1.26, 1.37, 1.43, and 1.53 in the obese (n = 103), overweight (n = 70), normal (n = 75), and underweight (n = 4), respectively. The ratio of SSDE to CTDI(vol) was greater in standard-sized participants than in large-sized participants independent of AEC adaptation; with AEC, SSDE/CTDI(vol) in large- vs. standard-sizedparticipants:
1.30 ± 0.08 vs. 1.44 ± 0.08 (p < 0.001) and without AEC, 1.32 ± 0.08 vs. 1.42 ± 0.06 (p < 0.001).CONCLUSION:
Volume CT dose index based on a reference phantom underestimates radiation exposure of LDCT in standard-sized Korean participants. The optimal radiation dose limit needs to be verified for standard-sized Korean participants.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Doses de Radiação
/
Magreza
/
Tomografia Computadorizada por Raios X
/
Índice de Massa Corporal
/
Projetos Piloto
/
Programas de Rastreamento
/
Exposição à Radiação
/
Tamanho Corporal
/
Sobrepeso
/
Tomografia Computadorizada de Feixe Cônico
Tipo de estudo:
Estudo diagnóstico
/
Estudo prognóstico
/
Estudo de rastreamento
Limite:
Humanos
País/Região como assunto:
Ásia
Idioma:
Inglês
Revista:
Korean Journal of Radiology
Ano de publicação:
2018
Tipo de documento:
Artigo
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