| Niu Yantao,Zhang Yongxian,Guo Senlin,Yu Binbin.Investigation on effect of dual-source CT scanning patterns on radiation dose and image quality of head and neck[J].Chinese Journal of Radiological Medicine and Protection,2016,36(12):943-946 |
| Investigation on effect of dual-source CT scanning patterns on radiation dose and image quality of head and neck |
| Received:July 25, 2016 |
| DOI：10.3760/cma.j.issn.0254-5098.2016.12.014 |
| KeyWords:Dual-source CT Head and neck Radiation dose Eye lens Thyroid |
| FundProject:北京市自然科学基金（7142039）；北京市卫生系统高层次卫生技术人才培养计划（20143019） |
| Author Name | Affiliation | E-mail | | Niu Yantao | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | ytniu163@163.com | | Zhang Yongxian | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Guo Senlin | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | | | Yu Binbin | Department of Radiology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China | |
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| Abstract:: |
| Objective To study the impact on the radiation dose, organ doses of eye lens and thyroid and image quality with different scanning modes in head and neck CT scan. Methods The simulation phantom of head and neck was scanned by using fixed scanning condition (120 kV and 200 mAs), as well as the combinations of automatic tube current modulation (CARE Dose 4D), automatic tube voltage modulation technique (CARE kV) and partial angle scanning mode (X-CARE) respectively. Six kinds of scanning modes were adopted, including 120 kV+200 mAs, 120 kV+200 mAs+X-CARE, CARE Dose 4D+120 kV, CARE Dose 4D+120 kV+X-CARE, CARE Dose 4D+CARE kV, CARE Dose 4D+CARE kV+X-CARE. Two thermoluminescece dosimeters(TLDs) were exposed at the skin surface positions of eye lens and thyroid, and the values measured with two TLDs were averaged. The CT dose index volume(CTDIvol) and dose length product (DLP) for every scan were recorded, and the contrast to noise ratio (CNR) in eye lens section and thyroid section were measured. Results The organ doses of lens and thyroid were 19.8 and 26 mGy at 120 kV and 200 mAs, as well as 13.3 and 22.2 mGy at X-CARE mode. Compared with the manual selection of 120 kV, the combination of CARE kV and CARE Dose 4D made the values of CTDIvol drop from 13.1 to 10.1 mGy, the doses of eye lens and thyroid from 16.6 and 20.8 mGy to 23.7 and 19.9 mGy respectively, while the image quality reduced significantly. Compared with CARE Dose 4D+120 kV, the organ doses of eye lens and thyroid were reduced from 20.8 and 23.7 mGy to 9.6 and 15.1 mGy for with additional X-CARE, while CTDIvol dropped from 13.1 to 9.3 mGy. When the combination of CARE Dose 4D+CARE kV+X-CARE was used, CTDIvol and organ doses were reduced to a minimum, when the CNRs of head and neck were also minimized. Conclusions The scanning mode CARE Dose 4D+120 kV+X-CARE for head and CARE Dose 4D+CARE kV for neck can effectively reduce the radiation dose while keeping good image quality. When requirements for image quality are not high, CARE Dose 4D+CARE kV+X-CARE mode can be selected to reduce the radiation dose significantly. |
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