Reducing the radiation dose with the adaptive statistical iterative reconstruction technique for chest CT in adults: a parameter study

被引:0
作者
Liu Wenyun [1 ]
Ding Xiaobo [1 ]
Kong Boyu [1 ]
Fan Baoyan [1 ]
Chen Liang [1 ]
机构
[1] Department of Radiology, The First Hospital of Jilin University
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中图分类号
R816.4 [胸部及呼吸系];
学科分类号
1001 ; 100105 ; 100207 ; 100602 ;
摘要
Background Currently there is a trend towards reducing radiation dose while maintaining image quality during computer tomography(CT)examination.This results from the concerns about radiation exposure from CT and the potential increase in the incidence of radiation induced carcinogenesis.This study aimed to investigate the lowest radiation dose for maintaining good image quality in adult chest scanning using GE CT equipment.Methods Seventy-two adult patients were examined by Gemstone Spectral CT.They were randomly divided into six groups.We set up a different value of noise index(NI)when evaluating each group every other number from 13.0 to23.0.The original images were acquired with a slice of 5 mm thickness.For each group,several image series were reconstructed using different levels of adaptive statistical iterative reconstruction(ASIR)(30%,50%,and 70%).We got a total of 18 image sequences of different combinations of NI and ASIR percentage.On one hand,quantitative indicators,such as CT value and standard deviation(SD),were assessed at the region of interest.The signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)were calculated.The volume CT dose index(CTDI)and dose length product(DLP)were recorded.On the other hand,two radiologists with≥5 years of experience blindly reviewed the subjective image quality using the standards we had previously set.Results The different combinations of noise index and ASIR were assessed.There was no significant difference in CT values among the 18 image sequences.The SD value was reduced with the noise index’s reduction or ASIR’s increase.There was a trend towards gradually lower SNR and CNR with an NI increase.The CTDI and DLP were diminishing as the NI increased.The scores from subjective image quality evaluation were reduced in all groups as the ASIR increased.Conclusions Increasing NI can reduce radiation dose.With the premise of maintaining the same image quality,using a suitable percentage of ASIR can increase the value of NI.To assure image quality,we concluded that when the NI was set at 17.0 and ASIR was 50%,the image quality could be optimal for not only satisfying the requirements of clinical diagnosis,but also achieving the purpose of low-dose scanning.
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页码:1284 / 1288
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共 5 条
  • [1] Combining low tube voltage and iterative reconstruction for contrast-enhanced CT imaging of the chest—Initial clinical experience[J] . Q. Li,H. Yu,L. Zhang,L. Fan,S-y. Liu. Clinical Radiology . 2013
  • [2] Characterization of a computed tomography iterative reconstruction algorithm by image quality evaluations with an anthropomorphic phantom
    Rampado, O.
    Bossi, L.
    Garabello, D.
    Davini, O.
    Ropolo, R.
    [J]. EUROPEAN JOURNAL OF RADIOLOGY, 2012, 81 (11) : 3172 - 3177
  • [3] Radiation dose of non-enhanced chest CT can be reduced 40% by using iterative reconstruction in image space
    Hu, X. H.
    Ding, X. F.
    Wu, R. Z.
    Zhang, M. M.
    [J]. CLINICAL RADIOLOGY, 2011, 66 (11) : 1023 - 1029
  • [4] Reducing Abdominal CT Radiation Dose With Adaptive Statistical Iterative Reconstruction Technique
    Prakash, Priyanka
    Kalra, Mannudeep K.
    Kambadakone, Avinash K.
    Pien, Homer
    Hsieh, Jiang
    Blake, Michael A.
    Sahani, Dushyant V.
    [J]. INVESTIGATIVE RADIOLOGY, 2010, 45 (04) : 202 - 210
  • [5] Is there a place for quantitative risk assessment?
    Hall, Eric J.
    [J]. JOURNAL OF RADIOLOGICAL PROTECTION, 2009, 29 (2A) : A171 - A184