|ESCR 2016 / P-0018|
|Dose and image quality in CT pulmonary angiography: Comparison of Dual-Source CT, third generation Dual-Energy CT and conventional 64-slice spiral CT|
Methods and Materials
Prospectively a total of 120 patients matched for sex, age, and body-mass-index were identified for this study and divided in three groups of 40 patients each. CTDIvol, DLP, subjective image quality as assessed by two readers (five-point scale: 1 = excellent; 2 = good; 3 = moderate; 4 = poor; 5 = non-diagnostic), measured CT attenuation (HU) in three central and peripheral levels, background noise (BN) and calculated signal-to-noise-ratio (SNR) were compared.
CT protocol settings of each patient group were chosen according to the manufacturer’s recommendations:
- Group 1: For conventional 64-slice SSCT the parameters were: 120 kV tube voltage, 150 mAs, 2x32x0.6 mm collimation with z-flying focal spot, 0.33 seconds gantry rotation time, and 300 mm/s table speed at a pitch factor of 1.4.
- Group 2: For single-energy DSCT the following parameters were used: 100 kV tube voltage, 150 mAS, 192x0.6 mm collimation, 0.25 seconds gantry rotation time, and 400 mm/s table speed at a pitch factor of 1.55.
- Group 3: For DECT acquisition the parameters were: 90 kV tube voltage (A tube) / 150 kV tube voltage (B tube), 300 mAs (A tube) / 150 mAs (B tube), 192x0.6 mm collimation, 0.25 seconds gantry rotation time, and 200 mm/s table speed at a pitch factor of 0.55. The dual-energy FOV was limited to 35.5 cm because of the smaller x-y axis coverage of the B detector.
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