Table 1.
CT scan parameters for LDCT and IR-HP-CT.
Table 2.
Image quality features assessed.
Fig 1.
Size-specific dose estimates in each volunteer using LDCT and IR-HP-CT.
The mean SSDE was significantly lower using IR-HP-CT (P < 0.001). The central box represents the values from the lower to upper quartile (25 to 75 percentile). The red squares are the means and the middle line represents the median.
Table 3.
Results of radiation dose.
Table 4.
Results of objective image analysis using LDCT and IR-HP-CT.
Fig 2.
Cardiac pulsation artifacts evident on LDCT and IR-HP-CT scans.
IR-HP-CT was associated with a significant reduction in cardiac pulsation (P < 0.0001). The black squares are the means and the horizontal bars the 95% confidence intervals.
Table 5.
Subjective image quality scores of LDCT and IR-HP-CT scans.
Fig 3.
Various pulmonary lesions and cardiac pulsation artifacts detected on IR-HP-CT and LDCT.
(A) Small bullae in both upper lobes (white arrows) and centrilobular emphysema in the right upper lobe (dotted circle). (B) Focal nodular consolidation with peripheral ground glass opacity in the subpleural area of the left upper lobe (paired black arrows). (C) A 3-mm-diameter ground glass opacity in the left upper lobe (paired white arrows). (D) IR-HP-CT revealed no cardiac pulsation (4 points), but LDCT was associated with blurring of both cardiac margins (2 points) at the time of cardiac pulsation (black arrowheads). Compared with IR-HP-CT, the LDCT scans exhibited bronchial wall and pulmonary vessel blurring artifacts attributed to cardiac pulsation in the pericardiac areas of both lung fields (dotted ovals).