This study aimed to evaluate image quality (IQ) of virtual monoenergetic images (VMIs) from novel spectral detector computed tomography angiography of the pulmonary arteries and to identify appropriate window settings for each kiloelectron volt level.Materials
Forty consecutive patients were included in this institutional review board–approved, Health Insurance Portability and Accountability Act–compliant study.Materials
Signal- and contrast-to-noise ratios were calculated within the pulmonary trunk, and pulmonary/lobar/segmental arteries were calculated. The IQ and diagnostic certainty were rated by 2 radiologists on 5-point scales. In addition, they recorded appropriate window settings (center/width) that were linearly modeled against attenuation within the pulmonary trunk to generate generable results.Results
Signal- and contrast-to-noise ratios, IQ, and diagnostic certainty are significantly increased in low–kiloelectron volt VMIs (≤60 keV). Interrater agreement was excellent (ĸ = 0.89). We developed 2 linear models (R2: 0.91–0.97 and R2: 0.43–0.91, respectively, P ≤ 0.01), that suggest appropriate window settings.Conclusions
The VMIs from spectral detector computed tomography improve objective and subjective IQ in angiography of the pulmonary arteries, if window settings are adjusted; they can be automatically estimated using reported linear models.