A uniformity correction method to reduce scan time for 7T sodium imaging of brain tumors.

Background And Purpose: Sodium imaging shows great potential for the characterization of brain tumors. Intensity correction is required but the additional scan time is costly. Recent developments can halve the time but were optimized in normal brains and may not be applicable in brain tumor imaging.

Longitudinal changes in COVID-19 clinical measures and correlation with the extent of CT lung abnormalities.

To assess the longitudinal changes and relationships of clinical measures and extent of CT lung abnormalities in COVID-19. 81 patients with COVID-19 were prospectively enrolled and followed until discharge. CT scores were quantified on a basis of a CT scoring system where each lung was divided into 3 zones: upper (above the carina), middle, and lower (below the inferior pulmonary vein) zones; each zone was evaluated for percentage of lung involvement on a scale of 0-4 (0, 0%; 1, 0-24%; 2, 25% - 49%; 3, 50% -74%; 4, >74%).