ABSTRACT
OBJECTIVE: To analyze and explore the value of MRI in distinguishing fresh from old vertebral compression fractures. METHODS: The features of MRI in 43 cases with compression fractures of thoracic or lumbar vertebral bodies were analyzed. MRI sequences included T1WI, T2WI and STIR. RESULTS: Fifty-five vertebral bodies in total were found compression fractures in 43 cases. Forty-six vertebral bodies, which showed low signals or low signals mixing a few high signals on T1WI, high signals on T2WI and significantly high signals on STIR, were identified as fresh compression fractures. Nine vertebral bodies were identified as old compression fractures, because they showed the same signals as normal vertebral bodies on T1WI, T2WI and STIR. CONCLUSION: MRI could accurately distinguish fresh and old vertebral compression fractures, so it is valuable for the distinguishment in forensic identification.
Subject(s)
Fractures, Compression/diagnosis , Lumbar Vertebrae/injuries , Magnetic Resonance Imaging , Spinal Fractures/diagnosis , Thoracic Vertebrae/injuries , Accidents, Traffic , Adult , Aged , Diagnosis, Differential , Female , Forensic Medicine , Fractures, Compression/etiology , Humans , Male , Middle Aged , Retrospective Studies , Spinal Fractures/etiology , Young AdultABSTRACT
This paper reports the determination of three nitrogen states in plants: nitric nitrogen, ammoniacal nitrogen and total nitrogen. The plant sample was digested by the Kjeldathl method with H2SO4 + H2O2. The solution of the sample was determined by three methods: absorption photometric method, indigotic colorimetry, and UV absorption photometric method after K2S2O8 oxidation. By comparing the results, the relationship among the three N states is that the total N = NH4+ + NO3-. Suitable methods were found for the determination of the elements, thus providing a scientific basis for the selection of suitable methods for chemical element analysis in plants.
