Sentence examples similar to partial spill from inspiring English sources
The described procedure essentially avoids partial volume effects (spill out as well as spill in) even in case of an obvious eccentric positioning of the ROI within the aorta.
This can be expected, as tracer uptake in the grey matter is higher in AD patients, resulting in a larger partial volume effect (spill-out).
Step 1: estimation of the actual object boundary with a threshold based method and determination of the total activity A measured within the enclosed volume V. Step 2: determination of the activity fraction B, which is measured outside the object due to the partial volume effect (spill-out).
The difference in average voxel value between smoothed and original non-smoothed mask is a direct measure of the partial volume effect (spill-out) for the tumour with its specific shape and size.
This is a consequence of the combined effect of partial volume effects and spill in from the background activity in the object of interest.
This effect could be explained by known imaging limitations in very small volumes such as partial volume effect or spill over from nearby organs.
CT-based VOIs resulted in underestimation of the activity concentration in the 68Ga-PET images for all SBRs and sphere sizes due to partial volume effect and spill out of the signal from the activity in the sphere to the background area.
Of course, the activity concentration in small volumes will be affected by partial volume effect and spill-over, and to a greater extent than with PET due to inherently lower SPECT spatial resolution.
No partial volume correction due to spill in of 124I background signal into the signal of the vials was necessary.
These low-level thresholds were chosen to include counts which due to spill out or partial volume effects are found outside the physical boundary of the object.
An accurate characterization of the point spread function (PSF) allows for compensation of the loss in contrast recovery using calculated spill-over and partial volume corrections [23].
