Contrast of artificial subcutaneous hematomas in MRI over time

摘要: In clinical forensic medicine, hematomas and other externally visible injuries build the basis for reconstruction of events. However, dating subcutaneous based on their external aspect is difficult. Magnetic resonance imaging (MRI) has proven its use in intracranial hemorrhage. Thus, aim was to investigate if MRI can also be used analyze an eventual influence hematoma shape. 20 healthy volunteers (11 females, 9 males, aged 26.9 ± 3.8 years), 4 ml autologous blood were injected subcutaneously thigh. The scanned immediately after injection, 3 24 h 3, 7, 14 days using three sequences with different contrast. Data analyzed by measuring signal intensities hematoma, muscle, tissue over time, Michelson contrast coefficients between tissues calculated. analysis, shape considered. Signal intensity proton density-weighted sequence reached maximum 3 h injection a subsequent decrease, whereas muscle fatty remained constant. time course coefficient versus decreased exponentially change from hyperintensity hypointensity at 116.9 h, depending sequences, either variability large or stayed constant time. observed permits quick estimate hematoma’s age. consideration expected further enhance MRI.