کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10732110 1043569 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Low contrast detectability performance of model observers based on CT phantom images: kVp influence
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
Low contrast detectability performance of model observers based on CT phantom images: kVp influence
چکیده انگلیسی
Object contrast was affected by kV, with differences up to 17% between the lowest and highest kV. Both models overestimated human performance and were corrected by efficiency and internal noise factors. The NPWE model reproduced better the human PC values trends showing Pearson's correlation coefficients ≥0.976 (0.954-0.987, 95% CI) for both experiments, whereas for CHO they were ≥0.706 (0.493-0.839). Bland-Altman plots showed better agreement between NPWE and humans being the average difference Δ and the range of the differences Δ±2σ (σ, standard deviation) of Δ=−0.3%, Δ±2σ = [−4.0%,4.5%]. For CHO, Δ=−1.2%, Δ± 2σ= [−10.7%,8.3%]. The NPWE model can be a useful tool to predict human performance in CT low contrast detection tasks in a standard phantom and be potentially used in protocol optimization based on kV selection.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica Medica - Volume 31, Issue 7, November 2015, Pages 798-807
نویسندگان
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