Figure 1.
Enhanced axial image at pulmonary arterial phase from a patient with pulmonary embolism.
The marked regions of interest are the endoluminal clot (diameter >5 mm) within the adjacent pulmonary artery.
Table 1.
Quantitative noise measurements as function of energy level.
Table 2.
Quantitative CNR Measurements as function of energy level.
Table 3.
Quantitative clot diameter as function of energy level.
Figure 2.
Comparison of subjective imaging scores.
A, 50 keV; B, 55 keV; C, 60 keV; D, 65 keV; E, 70 keV; F, 75 keV; G, 80 keV. The 65 keV monochromatic image shows less image noise than 50, 55, 60 keV and high conspicuity when compared with the 75 and 80 KeV images. However, there was no significant difference in the subjective scores of the CTPA between the 70 and 65 keV images. H, oblique coronal CTPA image shows the endoluminal clot within the left inferior pulmonary artery.
Table 4.
Subjective scores for image-quality assessment of VMS as function of energy level.