The operation.∗ represents the element-by-element multiplication of two matrixes.
Furthermore, we use to denote convolution, and for the one-by-one multiplication of two compatible functions and, that is, corresponds to for all.
In this case, the contribution of a certain frequency is obtained by multiplication of the two percentages, which can then be compared to the present study's results.
The IRS was calculated by multiplication of these two variables.
Subsequently, the respective score for each case was calculated by multiplication of these two parameters.
A final score was achieved by multiplication of the two scores above.
According to previous analyses [ 6] we analyzed the nuclear intensity of HDAC expression (negative, weak, moderate, strong) as well as the percentage of positive tumor cells and calculated the immunoreactivity score (IRS, 0 12) by multiplication of these two parameters.
○ Büchler pain score: alternative pain measure based on the Izbicki questionnaire, and calculated by the multiplication of two of the four items of the Izbicki questionnaire (i.e. pain frequency and pain intensity) [ 26].
Step 4. Mathematical morphology (smoothing by the erosion, prior to the space multiplication of two images) was conducted between the segmented lung volumes from CT scans and corresponding PET images in order to avoid FP uptake from nearby structures of the lungs.
Denote by A ⊙ B the element-by-element multiplication of the two matrices A and B, and by A ⊘ B the element-by-element division of the two matrices.
