It resulted that in all models around 40% of tumor volume lacks efficient washout; washout areas are frequently, but not always, restricted to the tumor periphery and that non-washout areas are not restricted to necrotic regions.
On dynamic CT or MRI scan, marked hypoattenuation or hypointensity with thin, incomplete peripheral enhancement in the arterial phase and peripheral washout (areas of viable cancer cells) with centripetal progression of enhancement over time (fibrous component) are typical.
concluded that either several postoperative troponin measurements resulting in a washout curve (area under the curve), or equally a 24-h post-surgery single measurement of troponin I, correlate best with new postoperative myocyte necrosis.
More specifically, in this limit we find that regardless of the washout geometry, the area of the channel that contains moving fluid is the same for each L. Essentially, uneven and distant parts of the washout become full of static fluid, below the yield stress, while the flow self-selects its own unique geometry.
Corresponding axial pre- and selected post-dynamic-contrast-enhanced GRE images with semi-quantitative contrast curves demonstrate corresponding early rapid enhancement with steep upslope (open white arrows in f) and contrast washout in the area of known recurrent tumour.
After 20 min of aCSF washout the response area returned to control.
While addition of the drug constricted the lamellipodia of RPTP cells and reduced cell area, washout restored normal surface area and lamellipodia spreading (Fig. 7I,J; supplementary material Movie 16).
Semi-quantitative parameters can be calculated from these enhancement curves, including the onset time (from injection to the appearance of contrast in the tissues), maximum signal intensity, gradient or rate of contrast uptake and washout, and initial area under the time signal curve (IAUC).
To characterize the kinetic features, maximum enhancement (ME), time to peak (TP), uptake rate (UR), washout rate (WR), and area under the curve are extracted from the time-intensity curve of each voxel.
