Effect of Dose Reduction on the Ability of Digital Mammography to Detect Simulated Microcalcifications
| Autor: | Yoshio Matsuo, Mayumi Cho, Mari Yakabe, Masafumi Masuda, Hidetake Yabuuchi, Taro Setoguchi, Takeshi Kamitani, Masayuki Sasaki, Shuji Sakai |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
medicine.medical_specialty
Digital mammography Radiation Dosage Imaging phantom Article Breast Diseases Medicine Mammography Humans Radiology Nuclear Medicine and imaging Computed radiography Radiological and Ultrasound Technology medicine.diagnostic_test business.industry Phantoms Imaging Radiation dose Calcinosis Computer Science Applications Radiographic Image Enhancement ROC Curve Area Under Curve Radiographic Image Interpretation Computer-Assisted Dose reduction Female Microcalcification Radiology medicine.symptom business Nuclear medicine |
| Popis: | The purpose of this article was to report the relationship between radiation dose and the ability of sentence digital mammography to detect microcalcifications. All images were acquired by computed radiography and an anthropomorphic breast phantom. The tube voltage and anode/filter combination used were 28 kVp and Mo/Mo. Simulated microcalcifications with an approximate diameter of 250–350 μm were positioned on the phantom. Groups of six microcalcifications were arranged in one of two patterns, a line cluster 1 cm long or a hexagonal cluster 4 mm wide. One of the six microcalcifications was removed to create a negative control. Each cluster was placed on 25 different points. Four levels of milliampere-second (mAs) values were applied: 100%, 50%, 25%, and 12.5%. Five staff radiologists participated in an observer performance test. All observers used a workstation with a 3-megapixel monochrome LCD monitor. The areas under the receiver-operating characteristics curves (AUC) were used to compare diagnostic performance among the four doses. The overall AUC scores were 0.97 with 100% mAs, 0.93 (n.s.) with 50%, 0.90 (p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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