High resolution reconstruction for optimization of imaging quality of GE Discovery CT 750 HD
10.13929/j.1672-8475.201707002
- VernacularTitle:高分辨靶重建模式优化宝石CT成像
- Author:
Mailin CHEN
1
;
Xiaoting LI
;
Yingshi SUN
Author Information
1. 北京大学肿瘤医院暨北京市肿瘤防治研究所医学影像科恶性肿瘤发病机制及转化研究教育部重点实验室
- Keywords:
Tomography,X-ray computed;
Phantoms,imaging;
High resolution
- From:
Chinese Journal of Interventional Imaging and Therapy
2018;15(2):104-107
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the value of high resolution reconstruction for optimization of imaging quality of GE Discovery CT 750 HD based on phantom pilot.Methods CT scanning with large (50 cm) and small (32 cm) scanning field of view (SFOV) was performed for a Catphan 500 phantom with or without high resolution on GE Discovery CT 750 HD.All raw data acquired by volumetric CT scan were reconstructed as the same size of a small DFOV (25 cm) with STAND algorithm.Then the images were divided into four groups,including large SFOV without high resolution (group A),large SFOV with high resolution (group B),small SFOV without high resolution (group C) and small SFOV with high resolution (group D).The spatial-resolution (SR),density-resolution (DR),noise (N),CNR,SNR and CT dose index volumes (CTDI) were measured and compared among 4 groups.Results The overall differences of SR,DR,N,CNR,SNR and CTDI were statistically significant among four groups (all P＜0.05).Compared with group A,the average N increased in group C (P＜0.01),SR increased in group B and the average CNR and SNR decreased in group D,while N increased in group D (all P＜0.01).Conclusion Large SFOV combined with high resolution reconstruction may ensure CNR and SNR,and improve SR.
