Abstract
Object To overcome the shortcoming of present commercial four-dimensional computerized tomography (4D-CT) reconstruction system and implement 4D-CT reconstruction based on multi-slices CT scanner. Methods A 4D-CT reconstruction software program (GTH4DIM V2.0) was developed by using VC++ and VTK software tools. The CT data of patient underwent free breathing were acquired in Cine mode by a GE LightSpeed 16 CT scanner, the Cine during time was equal to the breathing period of the patient plus one second ( about 4-6s) and 8 to 15 slices CT image were acquired by a row CT detector in every Cine scan. The phase of each CT slice was determined according to the volume change rule of scanned thoracic cavity and lung tissue during respiration. All of the CT data with same phase, which where acquired in Cine mode, were resorted by GTH4DIM V2.0 into a same CT series, and several 3D-CT series with different phases could be got. Then, 3D reconstruction of the CT data was completed by using GTH4DIM V2.0 software. Results Compared with the unsorted CT data, the motion artifacts in the 3D reconstruction of sorted CT data were reduced a lot, and all of the resorted multi-phase CT series result in a 4D-CT , which reflected the characteristics of the periodical motion viscera contained within the abdominal and thoracic cavities. Conclusion Time-resolved 4D-CT reconstruction of periodical motion viscera can be implemented with any general multi-slice CT scanners based on the volume change rule of scanned thoracic cavity and lung tissue during respiration, the process of the 4D-CT data acquisition and reconstruction were independent on the respiration monitoring system and not restricted to the hardware or software of the CT scanner, therefore, it’s a universal 4D-CT reconstruction method.
Published Version
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