high-resolution imaging of the head and neck improves the detection of the spatial distribution of the edema, enhancement of the tissues, vascular structures. Phlegmonous infiltration with the gas inclusions in the dissecting spread of the infection from the paratonsillar space down to the lower deep neck spaces. The anaerobic infection exhibit typically low-level enhancement due to the hypovascularization and hypoxic environment. Spectral information coud be used in the assessment of the enhancement within the margins of the infiltration. The smallest voxel of 0.4 combined with smaller field-of-view increased the confidence of the imaging with photon-counting CT

Naeotom Alpha Prime, University Hospital Pilsen, Czechia

paratonsillar absces on the left, color coded monoenergetic image 40keV
parapharyngeal phlegmona with hypovascularized margins spreading on the left between carotic sheath and piriform recess, color coded monoenergetic image 40keV
coronary MPR shoving the extent of the gas filled cavity disecting the deep cervical spaces on the left, ME 60 keV

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