Sentence examples for background region of interest from inspiring English sources
Conversely, in some instances, the larger background region of interest used in the Southampton method can add benefit by reducing noise and therefore uncertainty in the measurement of non-specific uptake [17].
We developed an ImageJ macro to perform post-processing of the ratio images from the raw 340 nm- and 380 nm- images, assuring that the background region of interest was never occupied by a unwanted fluorescent cell.
RVEF was calculated using manually drawn RV regions of interest and background region of interest.
The SNR was calculated as the mean signal intensity within the affected region (MaR or infarcted myocardium) divided by the standard deviation of signal intensities within a background region of interest.
Contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR) are calculated as follows: CNR = (ROIa − ROIb)/SD; SNR = ROIa/SD, where ROIa and ROIb are the CT numbers of the vessel region of interest and of the background region of interest, respectively.
For contrast-to-noise ratio calculation, myocardial and background regions of interest (white) were drawn on a midventricular short-axis image.
The statistics of the background regions of interest (ROIs) are shown in Figure 2, and we see that the image has a homogeneneous background (on average 103.5 counts/pixel with a standard deviation of 1.1 between the rows).
Furthermore, the results of comparison between the collimators indicate that the use of HS may reduce image contrast as reflected by lower contrast-to-noise ratio when a heavy smoothing is applied, which is likely due to the contamination of myocardial activity into the background regions of interest.
For each channel, 100 background regions of interest were randomly selected A normal distribution of the brightest pixel in each ROI was created and the mean and standard deviation was calculated.
To correct for this background, background spectra were extracted from low intensity regions-of-interest; an elaborate procedure that does not account for variations in the background within an image.
The images were background-subtracted, then a circular region-of-interest (ROI) was placed over each well, and integrated density was measured.
