Relationship between Injection Rate and Contrast Enhancement on Three-dimensional Digital Subtraction Angiography of the Cerebral Arteries

Abstract

Objective:Three-dimensional (3D) digital subtraction angiography (DSA) is becoming a common technique for the assessment of the cerebral arteries. Nevertheless, the injection parameters for each artery are not standardized among institutions. The objective of this study was to analyze the relationship between injection rate and contrast enhancement on 3D DSA of the common carotid artery.Materials and methods:Twenty-four patients who underwent 3D DSA of the common carotid artery from June 2013 to March 2015 were included in this retrospective study. Contrast enhancement of each patient was analyzed for four cerebral arteries segments (A1, A2, M1 and M2) by measuring the average pixel value on the source rotational two-dimensional DSA images. Linear regression analysis was used to investigate the correlation between injection rate and contrast enhancement.Results:All four regression lines showed that a higher injection rate led to higher contrast enhancement. There was a significant relationship for the A1, A2 and M1 segments (P = 0.008, 0.03 and < 0.001) but not for the M2 segment (P = 0.13). The goodness-of-fit of the regression lines was high for the M1 segment (R2 = 0.63). However, as the size of the vascular lumen became narrower, the value for the A1 (R2 = 0.28) and A2 (R2 = 0.19) segments became lower.Conclusion:In 3D DSA of the common carotid artery, contrast enhancement of a relatively wide lumen could be optimized by adjusting the injection rate. However, it is difficult to optimize the contrast enhancement of a relatively narrow lumen only by adjusting the injection rate.

Towards quantitative digital subtraction perfusion angiography: An animal study

“…Takagi et al. studied the relationship between injection rate and contrast enhancement on 3D DSA images 34 . Quantitative assessment of deconvolution‐based and TIC‐derived parameters may promote further applications of perfusion DSA in clinical practice.…”

“…33 Takagi et al studied the relationship between injection rate and contrast enhancement on 3D DSA images. 34 Quantitative assessment of deconvolutionbased and TIC-derived parameters may promote further applications of perfusion DSA in clinical practice. This work extends existing phantom studies to an in-vivo situation and further investigates the quantitative property of deconvolution-based perfusion DSA in arteries, veins, and parenchymal regions on realistic DSA acquisitions.…”