光谱 CT 虚拟单能量冠状动静脉一体化成像的 可行性分析.

Objective To study the feasibility of spectral CT virtual monoenergetic imaging (VMI) for one-stop coronary artery and vein examination. Methods From December 2023 to January 2024, an experimental group of 25 patients underwent coronary artery and vein CT imaging using personalized scanning protocols and a randomly selected controlled group of 25 patients underwent coronary artery CT imaging using routine scanning protocols. The conventional images of the experimental group as group B1, and the 40 keV virtual monoenergetic reconstructed images as group B2. The CT image quality of the control group (A), conventional CT (B1) and 40 keV VMI (B2) of the experimental group was evaluated quantitively including CT values, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) of coronary artery branches. Subjective evaluations were completed by two experienced radiologists using a 5-point scale, and the inter-rater reliability was analyzed using the Kappa test. Group comparisons were conducted using the Mann-Whitney test. Results CT values, SNR and CNR of the left main coronary arteries [(1306.07±185.16) HU, 101.820± 38.10, 113.91±42.13], right coronary arteries [(1284.97±203.8) HU, 99.99±37.61, 112.10±41.53], left circumflex coronary arteries [(1191.88±182.83) HU, 93.01±36.10, 105.11±39.92], and left anterior descending arteries [(1202.44±185.50) HU, 88.05±33.57, 106.33±41.84] in group B2 were significantly higher (P<0.001) than that of groups A and B1. The CT values, SNR and CNR values of the coronary veins including coronary sinus, great cardiac vein, posterior intraventricular vein, anterior interventricular vein, posterior vein of the left ventricle, and left marginal vein in group B2 were also significantly higher (P<0.001) than that of group B1. The subjective image quality scores of B2 group (5, 5) were better than that of groups A and B1 with good consistency (κ>0.7). Conclusion Spectral CT VMI allows one-stop examination of the coronary arteries and veins. [ABSTRACT FROM AUTHOR]