Effects of combining multiple dose reduction techniques on coronary computed tomography angiography

Figure 2 Subjective imaging quality scores. A: Excellent imaging quality (IQ) (score = 5) with sharp, smooth contours of the vascular wall and no streaking or radiating artifacts; B: Good IQ (score = 4) with slight irregularities on the contour and few streaks or radiating artifacts; C: Fair IQ (score = 3) with blurred and irregular contours of the vascular wall and numerous streaks or radiating artifacts; D: Poor IQ (score = 2) with deformation of the vascular wall and various artifacts; E: Very poor IQ (score = 1) with obvious deformation of the vascular wall and extensive artifacts. Images with IQ scores within 3-5 satisfy the requirements for the diagnostic assessment.