Bae K, et al. - Experts resolved to investigate the quality of virtual monoenergetic imaging (VMI) from dual-layer detector spectral CT and the effect of virtual monoenergetic images obtained at low energies on the detection of pulmonary embolism (PE) in patients with a suboptimally enhanced pulmonary artery on chest CT. It was determined that obtaining virtual monoenergetic images at a low energy setting using dual-layer detector spectral CT permitted the achievement of sufficient attenuation of the pulmonary artery while preserving image quality and increasing diagnostic performance for detecting PE, via chest CT examinations in which the pulmonary artery was suboptimally enhanced.