The objectives of this study were to assess quantitative and subjective image quality in computed tomographic pulmonary angiography using dual-energy subtraction methods compared with those of the monochromatic images using optimal contrast-to-noise ratios and those of the routine polychromatic images and to select the best dual-energy subtraction method.
A total of 1 routine polychromatic image, 3 sets of dual-energy subtraction images (DESIs), and 2 sets of monochromatic images with different optimal contrast-to-noise ratios from 30 patients were obtained. The signal intensity and noise were measured; signal-to-noise ratio and contrast-to-noise ratio (CNR) were calculated. The global subjective image quality was subjectively assessed.
The DESI 3 got the highest CNR and the DESI 1 got the second highest CNR. The DESI 1 got the highest global subjective image quality score. The 3 subtraction image sets got the highest score in visualization of the pulmonary artery branches.
Computed tomographic pulmonary angiography with dual-energy subtraction technique is feasible. The DESI 1 afforded the best balance between the quantitative analysis and the subjective evaluation.
From the Department of Radiology, Hua Dong Hospital of Fu Dan University, Shanghai, China.
Received for publication April 13, 2013; accepted June 10, 2013.
Reprints: Yanqing Hua, MD, No. 221 W Yan’an Rd, Department of Radiology, Hua Dong Hospital of Fu Dan University, Shanghai 200040, China. (e-mail: firstname.lastname@example.org; email@example.com).
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