| SONG Shao-juan,WANG Wei,LIU Chuan-ya.Relationship of radiation dose and spiral pitch for multi-slice CT system[J].Chinese Journal of Radiological Medicine and Protection,2006,26(5):526-528 |
| Relationship of radiation dose and spiral pitch for multi-slice CT system |
| Received:February 08, 2006 |
| DOI： |
| KeyWords:Multi-slice spiral CT Radiation dose Pitch |
| FundProject: |
|
| Hits: 3202 |
| Download times: 2455 |
| Abstract:: |
| Objective To study the relations of radiation dose and spiral pitch for multi-slice CT system. Methods 16 mm dose phantom with solidose 300/400 pen-style ion chamber inserted into each of five holes in turn was scanned with different spiral pitch by LightSpeed 16-slice CT and Sensation 16-slice and 64-slice CT and radiation dose. Results CTDIvol of axial scan and spiral scan for the three types of CT system are: (1)LightSpeed 16-slice CT: 28.9(axial),51.4(pitch 0.562),30.8(pitch 0.938) and 16.5(pitch 1.75);(2)Sensation 16-slice CT: 41.2(axial) and 40.3(pitch 0.5),41.5(pitch 1) and 43.2(pitch 1.5);(3)Sensation 64-slice CT: 41.2(axial) and 40.3(pitch 0.5),41.5(pitch 1),43.2(pitch 1.5). Conclusions For LightSpeed 16-slice CT,the measured radiation dose decreased with the increase of spiral pitch,the image quality could keep constant only if we increase mAs.While for Sensation 16-slice and 64-slice CT system,the measured radiation dose was identical for different pitch,and the image quality was identical because of the use of mAs auto control technique The mAs should be adjusted in different way according to the type of CT system when the pitch is changed in daily operation. |
| HTML View Full Text View/Add Comment Download reader |
| Close |
|
|
|
