Automatic spectral imaging protocol selection combined with iterative reconstruction can enhance image quality and decrease radiation and contrast dosage in abdominal CT angiography

  • Xiao-Ping Yin
  • Bu-Lang Gao
  • Cai-Ying Li
  • Zi-Wei Zuo
  • Ying-Jin Xu
  • Jia-Ning Wang
  • Huai-Jun Liu
  • Guang-Lu Liang
Original Article
  • 25 Downloads

Abstract

Purpose

To investigate the effect of automatic spectral imaging protocol selection (ASIS) and adaptive statistical iterative reconstruction (ASIR) technology in reducing radiation and contrast dosage.

Methods

Sixty-four patients were randomly divided into two groups for abdominal computed tomography (CT): the experiment group with ASIS plus 50% ASIR and the control with 120 kVp voltage.

Results

The CT dose-index volume decreased by 23.68 and 23.57% and the dose-length product dropped by 25.59 and 18.45% in the arterial and portal venous phases, respectively, in the experiment than control group. The contrast dose was reduced by 16.86% in the experiment group. In the 55 keV + 50% ASIR group, the arterial contrast-to-noise ratio and scores were significantly (P < 0.05) higher than in the control group in the arterial phase while the portal contrast-to-noise ratio and scores were not significantly different between the two groups (P > 0.05).

Conclusion

The ASIS technique plus 50% ASIR can enhance image quality of the abdominal structures while decreasing the radiation and contrast dosage compared with the conventional scan mode.

Keywords

Spectral computed tomography Angiography Monochromatic image Iterative reconstruction Radiation dose 

List of abbreviations

ASIS

Automatic spectral imaging protocol selection

ASIR

Adaptive statistical iterative reconstruction

CT

Computed tomography

BMI

Body mass index

SNR

Signal-to-noise ratio

ROI

Region of interest

ROIo

CT value in the liver parenchyma or vessels

ROId

CT value in the sacrospinal muscle

SDn

Mean background image noise

SD

Standard deviation

CTDIv

CT dose index volume

DLP

Dose-length product

ALARA

As low as reasonably achievable

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Copyright information

© Japan Radiological Society 2018

Authors and Affiliations

  1. 1.CT/MRI RoomAffiliated Hospital of Hebei UniversityBaodingPeople’s Republic of China
  2. 2.Department of Medical ResearchShijiazhuang First HospitalShijiazhuangPeople’s Republic of China
  3. 3.Department of Medical ImagingThe Second Hospital of Hebei Medical UniversityShijiazhuangPeople’s Republic of China

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