Subject(s)
Carotid Artery Thrombosis/complications , Carotid Stenosis/complications , Adult , Carotid Artery Thrombosis/diagnostic imaging , Carotid Artery Thrombosis/surgery , Carotid Artery, Internal , Carotid Stenosis/diagnostic imaging , Carotid Stenosis/surgery , Coronary Artery Disease/complications , Coronary Artery Disease/diagnostic imaging , Coronary Artery Disease/surgery , Endarterectomy, Carotid , Humans , Male , RadiographyABSTRACT
The authors analysed 45 ultrasonography (US) studies of 43 infants with surgically confirmed hypertrophic pyloric stenosis (HPS) to ascertain whether the current US criteria for pyloric stenosis are applicable to all infants, including those 30 days of age and younger. Most articles in the radiologic literature cite a muscle thickness of 4 mm or greater and a pyloric canal length of 17 mm or greater as diagnostic of HPS. However, the results of this study suggest that in infants 30 days of age or younger the muscle thickness considered diagnostic for HPS be 3 mm or greater.
Subject(s)
Pyloric Stenosis/diagnostic imaging , Aged , Aged, 80 and over , Female , Humans , Hypertrophy , Infant , Infant, Newborn , Male , Pyloric Antrum/diagnostic imaging , UltrasonographyABSTRACT
T2 values were measured at 0.23 and 4.7 T for deoxygenated blood samples (43%-73% O2 saturation) with hematocrits of 18%-100%. An increase in the hematocrit produced a marked reduction in T2 at both field strengths. Cell lysis did not abolish the T2 effect at either field strength. The authors conclude that the increase in hemoglobin concentration caused by formation of a retracted clot is a cause of the hypointense appearance of acute hemorrhage compared with brain on T2-weighted clinical magnetic resonance images. This is particularly important on low-field-strength systems, which are not sensitive to the T2 shortening effects of paramagnetic intracellular deoxyhemoglobin.
