Clinical Analysis of IDose4 Iterative Reconstruction in Low Dose CT Renal Artery Angiography

doi:10.7517/issn.1674-0475.190904

Abstract

Abstract: To evaluate the application of IDose⁴ iterative reconstruction technique in renal artery angiography with low-dose CT,205 patients who were to undergo renal artery CT angiography were randomly divided into four groups. Group A (51 cases) received 100 kV tube voltage, 100 mA tube current, 370 mg I/mL iohexol and IDose⁴ iterative reconstruction techniques. Group B (51 cases) used 100 kV tube voltage, 150 mA tube current, 270 mg I/mL iohexol and IDose⁴ iterative reconstruction techniques. Group C (51 cases) used 80 kV tube voltage, 180 mA tube current, 270 mg I/mL iohexol and IDose⁴ iterative reconstruction techniques.In group D, 52 cases were reconstructed by 120 kV tube voltage, 120 MV tube current, 370 mg I/ml iopromide and filter back projection (FBP). To determine the CT value, noise (SD), signal-to-noise ratio (SNR) and noise ratio (CNR) of renal aorta trunk in each group of images, the subjects received effective CT dose (ED), volumetric CT dose index (CTDI_vol), dose length product (DLP), iodine intake, reconstruction image score difference and diagnostic efficacy. The results showed that the scores of reconstructed images in group A, B and C were better than those in group D, CT value of renal artery trunk, SD, SNR and CNR in group A, B and C were higher than those in group D, while CT value of renal artery trunk and SD in group B and C were slightly lower than those in group A. CTDI_vol, DLP and ED in group A, B and C were lower than those in group D, while CTDI_vol, DLP and ED in group B were higher than those in group A. The diagnostic accuracy of A, B, C and D for renal aortic stenosis was 92.68%, 86.49%, 84.62% and 82.86%, respectively. The results confirmed that iterative reconstruction of IDose⁴ can reduce the dose of radiation and contrast agent and improve the quality of imaging. It has high feasibility and practicability in low dose CT renal angiography.

Key words: IDose⁴ iterative reconstruction, low dose, low radiation, CT renal artery angiography

CLC Number:

ZHOU Yongxia, ZHOU Rong. Clinical Analysis of IDose⁴ Iterative Reconstruction in Low Dose CT Renal Artery Angiography[J]. Imaging Science and Photochemistry, 2020, 38(2): 253-259.

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Clinical Analysis of IDose⁴ Iterative Reconstruction in Low Dose CT Renal Artery Angiography

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