| XIA Wei,WU Jing-tao,YIN Xiao-rui,WU Hai-tao.Study of low radiation characteristics of digital tomosynthesis in diagnostic imaging of skeletal system[J].Chinese Journal of Radiological Medicine and Protection,2012,32(6):656-659 |
| Study of low radiation characteristics of digital tomosynthesis in diagnostic imaging of skeletal system |
| Received:March 28, 2012 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.06.028 |
| KeyWords:Radiation dose DTS DR CT Skeletal system |
| FundProject: |
| Author Name | Affiliation | E-mail | | XIA Wei | Department of Radiology,Clinical Medical College of Yangzhou University, Yangzhou 225001,China \
| | | WU Jing-tao | Department of Radiology,Clinical Medical College of Yangzhou University, Yangzhou 225001,China \
| | | YIN Xiao-rui | Department of Radiology,Clinical Medical College of Yangzhou University, Yangzhou 225001,China \
| | | WU Hai-tao | Department of Radiology,Clinical Medical College of Yangzhou University, Yangzhou 225001,China \
| yzghmb@163.com |
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| Abstract:: |
| Objective To investigate the radiation dose differences of DTS, DR and CT in diagnostic imaging of the skeletal system and analyze the sensitivity and specificity of each modality in skeletal disease diagnosis. Methods 100 relevant patients with skeletal diseases were randomly selected, who were performed with DR, DTS and CT from Feb 2010 to Mar 2012. They were divided into three groups, respectively as the DR group, the DTS group and the CT group. The complete information including DR, DTS, CT data and the final clinical diagnosis were collected and the statistical analysis after comparing radiation dose of DR, DTS and CT examination. Two experienced experts evaluated the image of three examinations and made judgments. ROC curves of reader A and B were made by using the final clinical diagnosis as gold standard. Results The average absorbed dose and effective dose of DR, DTS, CT group were ［(1.9±1.8)mGy, (0.03±0.03) mSv)］, ［(3.5±1.5)mGy, (0.05±0.02) mSv)］, ［(397.7±106.0)mGy·cm、(5.60±1.50) mSv］ respectively. The difference among the three groups was analyzed by one-way ANOVA test(F=1377, P<0.05) and had statistically significant(P<0.05). ROC curve was drawn through analyzing lesion detection credibility of three groups. The AZ values of reader A and B was(0.870±0.035,0.966±0.018,0.974±0.015)and(0.852±0.038,0.951±0.021,0.959±0.019)respectively. Do the Z-test to these examinations’ area under ROC curve of lesion detection credibility. Between DR and DTS or DR and CT, there was statistically significant(P<0.05). While for CT and DTS, there was not statistically significant. The two readers’ sensitivity and specificity in diagnosing skeletal lesion with DR, DTS and CT were investigated using the χ2 test: CT and DTS were no statistical significance, CT and DR were statistically significant(χ2=4.833,P<0.05). Conclusions Radiation dose of DTS only accounts for about 1% of CT examination. While its sensitivity and specificity can meet the requirements for clinical diagnosis as CT. If the DR diagnosis is unclear or suspected, DTS should be the first recommended modality used for skeletal diagnosis with lower radiation dose. |
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