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| The Research of Applications with Step-shot Scaning to Reduse Radiation Dose in Lumbar Spine CT |
| FU Yu-cun1, LIU Da-liang1, SHI Pu-jun1, WEI Li1, GAO Cui-cui2, LIU Cheng3 |
1. Department of CT Shandong Liaochang People's Hospital, Liaocheng 252000 China;
2. Research Department of Philips, Beijing 100013 China;
3. Shandong Medical Imaging Research Institute, Jinan 250021 China |
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Abstract Objective To discuss the clinical significance and the possibilities of low dose CT scaning with step-shoot CT technology in lumbar vertebra. Methods The phantom of abdomen is needed for the basic study of the new protocol. 200 patients who underwent lumber CT scan were randomly divided into the step-shoot CT group(experimental group A,B) and the Spiral CT group(control group C,D), each of 50 cases. The new protocol with step-shoot technology were performed in the experimental group; group A was routine-dose group:120 kV, 300 mAs; Group B was low-dose group:120 kV, 200 mAs. The control group was scanned with the conventional spiral CT. Group C was routine-dose group:120 kV, 300 mAs, pitch factor of 0.993; Group D was low-dose group:120 kV,200 mAs, collimation 128×0.625, 1mm slice thickness and 0.5 mm increment,FOV 180 mm. Computed Tomography Dose Index(CTDI) and Effective Dose (ED) were recorded separately. The original and MPR images were transferred to the PACS and evaluated by radiologists. The data were analyzed by SPSS. Results Radiation dose of the patients of the experimental group was lower than that of the control group; the dose (7.16 mSv) of group A was lower than that of group C(7.96 ±0.23 mSv); the dose (4.77 mSv) of group B was lower than that of group D (5.55 ±0.1 mSv); the dose of group B was lower than that of group C (P < 0.05). The image quality of group A had no difference with group C (P < 0.05); the image quality of group B was better than group D (P < 0.05); there was no significant difference between the group B and C in image quality(P > 0.05). Conclusion Low dose CT scaning with step-shoot technology in lumbar vertebra is practicable and the radiation dose can be greatly reduced.
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Received: 08 August 2013
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