Influence of new chest CT technologies with low-dose on image quality:an intra-indvidual comparison
10.3969/j.issn.1002-1671.2016.02.029
- VernacularTitle:个体内对照研究 CT 新技术对胸部低剂量 CT 图像质量的影响
- Author:
Xiaoli XU
;
Wei SONG
;
Xin SUI
;
Xiao WANG
;
Qianni DU
- Publication Type:Journal Article
- Keywords:
lung;
low dose;
computed tomography;
image noise
- From:
Journal of Practical Radiology
2016;(2):277-280,291
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate retrospectively the image quality and detection of nodules with low-dose chest computed tomography (LDCT)by photon detector and iterative reconstruction (IR).Methods Sixty-six patients with lung nodules underwent routine LDCT with image reconstruction using filtered back projection (FBP).These patients were followed up by LDCT with photon detector 6 months later with image reconstruction using FBP and SAFIRE.Image quality and detection rate of the nodules were compared among groups including routine LDCT,photon decector+FBP and photon Decector+IR groups.Results Noise was decreased and SNR was increased in turn for routine LDCT,photon detector+FBP and photon detector +IR,exhibiting statistical differences (all P<0.001).The CT image quality score among routine LDCT,photon decector+ FBP and photon decector+ IR groups were increased in turn with statistical differences (χ2 =32.65,P<0.001).132 lung solid nodules (SN)were all identified in three groups with average diameter of (5.13±1.49)mm, (5.1 1±1.57)mm and (5.08±1.54)mm,respectively,and the difference was not statistically significant (P >0.05).14 ground glass nodules (GGN )in routine LDCT group and 15 in other two groups were identified with the average diameter of (6.44±1.86)mm, (7.23±1.74)mm and (7.31±1.68)mm,respectively.The ability of routine LDCT to detect the GGNs was lower than that of the others.Conclusion Photon detector and IR are able to decrease image noise,improve image quality,and increase detection rate and measurement accuracy of GGN.
