Abstract
To evaluate the image quality (IQ) and the figure of merit (FoM) of chest CT screening in patients with overweight or obesity using a tin filter for spectral shaping at 150kVp. Patients with overweight or obesity (N = 150, body mass index ≥ 26kg/m2) with indications forchest CT screening were prospectively enrolled and randomly divided into three groups: 120kVp group (standard radiation dose/tube voltage, 120kVp/CT volume does index, 4.68mGy); Sn100kVp group (1/10th radiation dose level/100kVp with a tin filter/0.47mGy); Sn150 kVp group (1/2th radiation dose level/150kVp with a tin filter/2.34mGy). IQ and FoMs were evaluated and compared among the three groups. Image noise, signal-to-noise ratios and subjective IQ scores were significantly higher in the Sn150kVp group than those in the Sn100kVp group (all p < 0.05), but were not significantly different with those in the 120kVp group. FoMs in the Sn150kVp group were significantly higher than those in the 120kVp group (all p < 0.05), but showed no statistical difference with those in the Sn100kVp group. Compared with scanning at 120kVp, chest CT screening performed at 150kVp with spectral shaping substantially reduces the radiation dose in overweight and obese patients while maintaining IQ.
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