A comparative study for image quality by tube voltage (KVP) of digital mammography system Mammography, which is now a commonly used method for examining breast cancer, is being operated with low voltage owing to the anatomic structure of breast. Although this low voltage imaging technique improves t...
A comparative study for image quality by tube voltage (KVP) of digital mammography system Mammography, which is now a commonly used method for examining breast cancer, is being operated with low voltage owing to the anatomic structure of breast. Although this low voltage imaging technique improves the contrast of an image, it has the primary drawback of high exposure dose. However, in comparison with the traditional S/F system, digital image is much more distinguishing as the latitude of radiography condition is large. In this regard, this study will analyze the change of image quality by tube voltage in digital mammography system. When it comes to an experiment method in this study, an ACR breast phantom and a bar pattern to measure MTF were tested, ranging 28kVp to 40 kVp with each 3 kVp difference: 28, 31, 34, 37, 40 kVp. In addition, the values of each tube current were obtained by selecting within 10 percent error range after the measurement of pixel value, and based on this radiography condition, the average grandular exposure dose was measured. As a result, as tube voltage was higher, the average grandular exposure dose decreased by maximum 0.14mGy. The outcomes of a breast phantom experiment in fiber recorded the peak value, 4.9 point at 28kVp and the next 4.7 point at 34kVP, 4.64 point at 31kVp, 4.12 point at 37kVp, and 3.98 point at 40kVp. In calcification, the findings were 3.5 point at 31kVp, 3.4 point at 28kVp, 3.2 point at 34kVp, 3.02 point at 37kVp, and 2.77 point at 40kVp. Lastly, in mass region, the result showed 4.62 point at 31kVp, 4.42 point at 28kVp, 4.20 point at 34kVp, 4.02 point at 37kVp, and 3.88 point at 40kVp. In addition, the result of MTF measurement in 2.091p/mm presented 76.5% at 31kVp, 76.2% at 28kVp, 75.8% at 34kVp, 75.6% at 37kVp and 75.3% at 40kVp. Hence, this experiment shows that image quality is outstanding at 31kVp and it is still relatively good until 37kVp, but at 40kVp the contrast becomes significantly low. In conclusion, on the contrary to the S/F system which requires precise radiography condition by breast sizes of patients, digital mammography has latitude of tube voltage change. Therefore, in order to reduce exposure dose to patients, the method of radiography to increase tube voltage can be considerable.
A comparative study for image quality by tube voltage (KVP) of digital mammography system Mammography, which is now a commonly used method for examining breast cancer, is being operated with low voltage owing to the anatomic structure of breast. Although this low voltage imaging technique improves the contrast of an image, it has the primary drawback of high exposure dose. However, in comparison with the traditional S/F system, digital image is much more distinguishing as the latitude of radiography condition is large. In this regard, this study will analyze the change of image quality by tube voltage in digital mammography system. When it comes to an experiment method in this study, an ACR breast phantom and a bar pattern to measure MTF were tested, ranging 28kVp to 40 kVp with each 3 kVp difference: 28, 31, 34, 37, 40 kVp. In addition, the values of each tube current were obtained by selecting within 10 percent error range after the measurement of pixel value, and based on this radiography condition, the average grandular exposure dose was measured. As a result, as tube voltage was higher, the average grandular exposure dose decreased by maximum 0.14mGy. The outcomes of a breast phantom experiment in fiber recorded the peak value, 4.9 point at 28kVp and the next 4.7 point at 34kVP, 4.64 point at 31kVp, 4.12 point at 37kVp, and 3.98 point at 40kVp. In calcification, the findings were 3.5 point at 31kVp, 3.4 point at 28kVp, 3.2 point at 34kVp, 3.02 point at 37kVp, and 2.77 point at 40kVp. Lastly, in mass region, the result showed 4.62 point at 31kVp, 4.42 point at 28kVp, 4.20 point at 34kVp, 4.02 point at 37kVp, and 3.88 point at 40kVp. In addition, the result of MTF measurement in 2.091p/mm presented 76.5% at 31kVp, 76.2% at 28kVp, 75.8% at 34kVp, 75.6% at 37kVp and 75.3% at 40kVp. Hence, this experiment shows that image quality is outstanding at 31kVp and it is still relatively good until 37kVp, but at 40kVp the contrast becomes significantly low. In conclusion, on the contrary to the S/F system which requires precise radiography condition by breast sizes of patients, digital mammography has latitude of tube voltage change. Therefore, in order to reduce exposure dose to patients, the method of radiography to increase tube voltage can be considerable.
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