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| Measurement and analysis of DLP values in two chest CT scanning modes |
| LIU Fang, WANG Xiaoshan, CHEN Yingmin, SONG Gang, LIU Qian, NIU Fei |
| Institute of Radiation Medicine, Shandong Academy of Medical Sciences Shandong First Medical University, Jinan 250062 China |
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Abstract Objective By comparing the dose length product (DLP) values of routinechest CT scanand low-dose CT chest scan, we can provide data for the selection of chest CT scan conditions.Methods Using a CT Dose Profiler(CT-DP) and a standard CT dose phantom, we measured DLPs in the routineand low-dose chest CT scanning modes by GE revolution 256-slice CT.Results Forlow-dose chest scanning modes:in Chest_Lowdose LARGE SIZE mode, DLP measured was 60.16 mGy·cm; in Chest_Lowdose SMALL SIZE mode,DLP was 33.65 mGy·cm;and for routine chest scan, DLP was 276.68 mGy·cm.The DLP value ofthe routine chest scanning mode is 8.22 times larger than that ofChest_Lowdose SMALL SIZE mode, and 4.60 times larger than that in the Chest_Lowdose LARGE SIZE mode.And for the two low-dose chest scans, depending on the size of the subject,the DPL of Chest_Lowdose LARGE SIZE mode was 1.79 times larger than that of Chest_Lowdose SMALL SIZEmode.Conclusion Low-dose chest scan can significantly reduce the dose of the subject, and choosing a suitable low-dose chest scan for the subject with a small size will also significantly reduce the dose.
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Received: 07 May 2019
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