| MIAO Ying,SONG Jun-feng,CHEN Wei-fei,et al.Correlation between image quality and radiation dose on screening mammography[J].Chinese Journal of Radiological Medicine and Protection,2011,31(5):606-609 |
| Correlation between image quality and radiation dose on screening mammography |
| Received:March 11, 2011 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.05.031 |
| KeyWords:Screening mammography Automatic optimization of parameters(AOP) Average glandular doses Image quality figure inverse |
| FundProject:杭州市医疗卫生科研项目(20090833B34) |
|
| Hits: 4148 |
| Download times: 2462 |
| Abstract:: |
| Objective To obtain the matched parameters between image quality and radiation dose by exploring the influence of the exposure parameters of screening mammography on both the image quality and radiation dose. Methods The correlation between the exposure parameters and average glandular doses to 507 patients undergoing screening mammography were retrospectively analyzed. The influence of breast compression thickness on radiation dose by exposing different thickness of PMMA was obtained. The correlation with image quality was analyzed by combined testing of contrast detail test mode (CDMAM3.4) and different thickness of PMMAs. Results The groups aged 30 to 49 years were the main groups in 507 examined patients, up to 67.06% of the total. The mean value of average gland doses (AGD)in contrast-prior mode was the highest in three kinds of exposure modes, accounting for 137.5% of standard mode. In standard mode, target material/filtration board combination was Mo/Mo, Mo/Rh and Rh/Rh, accounting for 1/3 respectively. Mo/Rh and Rh/Rh were selected in dose-prior mode, accounting for 50% respectively. Mo/Mo was mainly selected in contrast-prior, accounting for 52%.Breast compression thickness was positively correlated with average gland doses. Image quality figure inverse (IQFinv) under three kinds of modes (STD,DOSE,CNT) was 98.32, 95.41 and 107.02, respectively, and IQFinv of contrast-prior mode was the highest among them. IQFinv was in general agreement in the three kinds of exposure modes when the thickness of PMMA plates plates was greater than or equal to 5 cm. Conclusions In clinical practice, when the breast is of density type and pressed thickness is less than 4 cm, the dose-prior mode should be selected. When the pressed thickness is between 4 and 6 cm, the standard exposure mode should be selected. When the pressed thickness is larger than 6 cm, the manual mode should be selected. |
| HTML View Full Text View/Add Comment Download reader |
| Close |
|
|
|
