| DING Wen-hong,ZHANG Wei-min,DING Xin-fa.Studies on the correlation between photograph condition and image quality on computed radiography[J].Chinese Journal of Radiological Medicine and Protection,2007,27(6):590-592 |
| Studies on the correlation between photograph condition and image quality on computed radiography |
| Received:March 27, 2007 |
| DOI： |
| KeyWords:Computed radiography Speed class Image quality Threshold contrast-detail detectability(TCDD) |
| FundProject:浙江省医药卫生科技基金资助项目(2004A039) |
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| Abstract:: |
| Objective To evaluate how to use reasonably the combination of exposure dose and speed class on the base of imaging quality on computed radiography (CR).Methods Based on threshold contrast-detail detectability (TCCD)technique, phantom TO.16 photography was done with 55, 65 and 75 kV, and combination with three kinds of different exposure dose and speed class respectively. Three radiologists scored each image sequence using double blind method and calculated the threshold detection index (HT). The imaging quality of knee joint, chest and lumbarspine was also evaluated by these radiologists on the base of diagnostic quality and the different combination of exposure dose and speed class. Results Exposure dose was increased by using lower kV value, and HT value was increased by lower exposure grade rather than higher kV value. Exposure dose was decreased obviously and speed class was increased in the good contrast location at the same kV value. Conclusions Based on the demand of diagnostic quality and the contrast of the checked location, the speed class should be carefully selected to decrease the radiation dose exposure to patients, without any decrease of the diagnostic quality. |
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