Table 3 Scoring scale for the image quality of CTA: descriptive reference

Score 1 (Excellent)

Excellent image quality. Complete absence of artifacts or blurring, which enables sufficient definition of vessel walls and excellent attenuation of vessel lumina

Score 2 (Good)

Good image quality. Minor artifacts, suboptimal attenuation of vessel lumina, vascular contour, and lumen remain easily detectable despite mild blurring

Score 3 (Poor)

Poor image quality. Moderate artifacts, suboptimal attenuation of vessel lumina, minimal-to-mild vessel discontinuity

Score 4 (Non-diagnostic)

Very poor image quality. Non-diagnostic or unacceptable because of poor enhancement of vessels, vessel contours are undetectable, or contain severe artifacts or blurring