| Liang Xiaoxue,Gao Jianbo,Liang Lidan,et al.Image quality assessment of computed tomography pulmonary angiography performed using a 70 kV/sn150 kV model combined with the advanced modeled iterative reconstruction method in overweight patients[J].Chinese Journal of Radiological Medicine and Protection,2020,40(10):777-782 |
| Image quality assessment of computed tomography pulmonary angiography performed using a 70 kV/sn150 kV model combined with the advanced modeled iterative reconstruction method in overweight patients |
| Received:May 28, 2020 |
| DOI：10.3760/cma.j.issn.0254-5098.2020.10.008 |
| KeyWords:Body mass index Dual-energy Computed tomography pulmonary angiography Iterative reconstruction |
| FundProject: |
| Author Name | Affiliation | E-mail | | Liang Xiaoxue | Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | | | Gao Jianbo | Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | cjr.gaojianbo@vip.163.com | | Liang Lidan | Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | | | Zhang Yage | Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | | | Liu Xing | Department of Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | |
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| Abstract:: |
| Objective To evaluate the image quality of dual-source computed tomography pulmonary angiography (DE-CTPA) with low-dose contrast agent using the advanced modeled iterative reconstruction (ADMIRE) method with 70 kVp and non-linear blending in overweight patients. Methods Seventy patients (normal BMI, 35; overweight, 35) with suspected pulmonary embolization who underwent DE-CTPA between October 2018 and March 2019 were included in this study. The imaging protocol included assessments at 70 kV/sn150 kV with 30 ml of contrast agent, and images were obtained at 70 kVp and 150 kVp with and without linear blending. The CT value, SD value, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) of pulmonary arteries were compared and analyzed among groups 1 (70 kVp, normal BMI), 2 (non-linear blending, normal BMI), 3 (70 kVp, overweight), and group 4 (non-linear blending, overweight ). The radiation dose parameters included CT volume dose index (CTDIvol), dose length product (DLP), and effective dose (E ). Results The CT values for the pulmonary artery did not show significant differences among the four groups (P>0.05 ). The SD value of the segmental artery in group 1 was higher than that in group 4 (t=2.69,P<0.05 ). The SNR values of the pulmonary artery trunk and sub-segmental artery in group 2 were higher than those in group 3 (t=1.44, 5.40, P<0.05), while the corresponding value of the left pulmonary artery trunk in group 2 was higher than those in groups 3 and 4 (t=1.52, 1.52, P<0.05 ). The CNR values of the pulmonary artery trunk and sub-segmental artery in group 2 were higher than those in group 3 (t=1.45, 5.01, P<0.05) and that of the left pulmonary artery trunk in group 2 was higher than those in groups 3 and 4 (t=1.50,1.50, P<0.05 ). The E values for normal BMI and overweight patients were(1.60±0.54)mSv and(1.88±0.45)mSv, respectively. Conclusions For overweight patients, the CTPA protocol using ADMIRE with a 70 kV/sn150 kV scanning mode could yield diagnostic image quality with significantly lower radiation and contrast material doses. |
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