Objective: Phase-contrast X-ray imaging which reduces radiation exposure, is a promising technique for observing the inner structures of biological soft tissues without the aid of contrast agents. The present study in...Objective: Phase-contrast X-ray imaging which reduces radiation exposure, is a promising technique for observing the inner structures of biological soft tissues without the aid of contrast agents. The present study intends to depict blood vessels of rabbits and human livers with hard X-ray in-line outline imaging without contrast agents using synchrotron radiation. Methods: All samples were fixed with formalin and sliced into 6 mm sections. The imaging experiments were performed with Fuji-IX80 films on the 4W1A light beam of the first generation synchrotron radiation in Beijing, China. The device of the experiment, which supplies a maximum light spot size of 20×10 mm was similar to that of in-line holography. The photon energy was set at 8 KeV and high quality imagines were obtained by altering the distance between the sample and the film. Results: The trees of rabbit-liver blood vessels and the curved vessels of the cirrhotic human liver were revealed on the images, where vessels < 20 μm in diameter were differentiated. Conclusion: These results show that the blood vessels of liver samples can be revealed by using hard X-ray in-line outline imaging with the first generation synchrotron radiation without contrast agents.展开更多
Radiographic measurements was performed on 124 normal adults for anterior, posterior and middle heights of the vertebral bodies in thoracic and lumbar spine. The normal ratios of vertebral height in one vertebral body...Radiographic measurements was performed on 124 normal adults for anterior, posterior and middle heights of the vertebral bodies in thoracic and lumbar spine. The normal ratios of vertebral height in one vertebral body and one with the adjacent bodies were presented. The method for measurement and its diagnostic value to osteoporotic vertebral fractures were discussed.展开更多
Objective ：To choose a proper method of lumbar transpedicular screw fixation at different lumbar levels among the three methods （ Roy-Camille＇s method, Magerl＇s method and Du＇s method） in the Chinese population....Objective ：To choose a proper method of lumbar transpedicular screw fixation at different lumbar levels among the three methods （ Roy-Camille＇s method, Magerl＇s method and Du＇s method） in the Chinese population. Methods ： Three-dimensional （ 3-D ） images were reconstructed with image data of 42 adult lumbar segments that were scanned by Electron Beam CT. The three methods of lumbar pedicle screw fixation were simulated on the 3-D reconstructed images and the parameters of implanting pedicle screws were measured. Results： There was statistically significant difference at the distance from the entrance point to the pedicle axis between the three methods （P 〈 0.001 ）. The distances measured by Du＇s method were shortest from L1 to L4, and the distances measured by Magerl＇s method were shortest at L5 （P 〈0.05）. There was no significant difference from L1 to L2 （P 〉0.05） but significant difference from L3 to L5 at inserting safe ranges of TSA （transverse section angle ） was found between the three methods （P 〈0.05）. From L3 to L4, the inserting safe ranges of TSA measured by Du＇s and Magerrs methods were significantly larger than that measured by Roy- Camille＇s method （P 〈0.05）, but there was no significant difference between them （ P 〉 0.05）. At L5, the inserting safe ranges of TSA measured by Magerrs method were largest among the three methods （ P 〈 0.05 ）. Conclusions： Among the three methods, Du＇s method is the best choice from L1 to L4 because its distance from the entrance point to the pedicle axis is shortest and the safe range of TSA is largest; Magerl＇s method can be used from L3 to L5 and is the best choice at L5; Roy- Camille＇s method is applicable at L1 and L2.展开更多
基金Supported by National Natural Science Foundation of China (10275087)Shanghai Optic Science Fund (022261023)Shanghai Natural Science Fund (02ZF14116)
文摘Objective: Phase-contrast X-ray imaging which reduces radiation exposure, is a promising technique for observing the inner structures of biological soft tissues without the aid of contrast agents. The present study intends to depict blood vessels of rabbits and human livers with hard X-ray in-line outline imaging without contrast agents using synchrotron radiation. Methods: All samples were fixed with formalin and sliced into 6 mm sections. The imaging experiments were performed with Fuji-IX80 films on the 4W1A light beam of the first generation synchrotron radiation in Beijing, China. The device of the experiment, which supplies a maximum light spot size of 20×10 mm was similar to that of in-line holography. The photon energy was set at 8 KeV and high quality imagines were obtained by altering the distance between the sample and the film. Results: The trees of rabbit-liver blood vessels and the curved vessels of the cirrhotic human liver were revealed on the images, where vessels < 20 μm in diameter were differentiated. Conclusion: These results show that the blood vessels of liver samples can be revealed by using hard X-ray in-line outline imaging with the first generation synchrotron radiation without contrast agents.
文摘Radiographic measurements was performed on 124 normal adults for anterior, posterior and middle heights of the vertebral bodies in thoracic and lumbar spine. The normal ratios of vertebral height in one vertebral body and one with the adjacent bodies were presented. The method for measurement and its diagnostic value to osteoporotic vertebral fractures were discussed.
文摘Objective ：To choose a proper method of lumbar transpedicular screw fixation at different lumbar levels among the three methods （ Roy-Camille＇s method, Magerl＇s method and Du＇s method） in the Chinese population. Methods ： Three-dimensional （ 3-D ） images were reconstructed with image data of 42 adult lumbar segments that were scanned by Electron Beam CT. The three methods of lumbar pedicle screw fixation were simulated on the 3-D reconstructed images and the parameters of implanting pedicle screws were measured. Results： There was statistically significant difference at the distance from the entrance point to the pedicle axis between the three methods （P 〈 0.001 ）. The distances measured by Du＇s method were shortest from L1 to L4, and the distances measured by Magerl＇s method were shortest at L5 （P 〈0.05）. There was no significant difference from L1 to L2 （P 〉0.05） but significant difference from L3 to L5 at inserting safe ranges of TSA （transverse section angle ） was found between the three methods （P 〈0.05）. From L3 to L4, the inserting safe ranges of TSA measured by Du＇s and Magerrs methods were significantly larger than that measured by Roy- Camille＇s method （P 〈0.05）, but there was no significant difference between them （ P 〉 0.05）. At L5, the inserting safe ranges of TSA measured by Magerrs method were largest among the three methods （ P 〈 0.05 ）. Conclusions： Among the three methods, Du＇s method is the best choice from L1 to L4 because its distance from the entrance point to the pedicle axis is shortest and the safe range of TSA is largest; Magerl＇s method can be used from L3 to L5 and is the best choice at L5; Roy- Camille＇s method is applicable at L1 and L2.
