A study of SPECT/CT camera stability for quantitative imaging.
EJNMMI Phys
; 3(1): 14, 2016 Dec.
Article
em En
| MEDLINE
| ID: mdl-27473290
ABSTRACT
BACKGROUND:
The purpose of this study was twofold to evaluate the quantitative stability of a SPECT/CT gamma camera over time and to determine if daily flood acquisitions can reliably serve as calibration factors for quantitative SPECT. Using a cylindrical water phantom filled with measured amounts of (99m)Tc, factors were calculated to convert counts/cc to activity/cps. Measurements were made over an 18-month period. System sensitivity data calculated from (57)Co daily quality assurance (DQA) flood acquisitions were then compared to the (99m)Tc calibration factors to determine the relationship of the factors.RESULTS:
The coefficient of variation is 2.7 % for the (99m)Tc cylinder conversion factors and 2.6 % for the (57)Co DQA flood data. The greatest difference between the cylinder conversion factors and the flood data is less than 3 %.CONCLUSIONS:
Based on the results, the camera was stable within 3 % over an 18-month time period. The daily flood source acquisitions can be a reliable source for tracking camera stability and may provide information on updating the calibration factor for quantitative imaging.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
EJNMMI Phys
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Estados Unidos