Semiquantitative reconstructive methods

In semiquantitative methods, static images are utilized as in visual assessment to determine the tissue activity and compare the relative tumor uptake. One method uses an index, the tumor-to-normal tissue activity ratio (T/N), using data from the normal and tumor regions on the reconstructed images. The ratios are independent of the administered dosage, patient s weight or blood glucose level. The T/N ratio assessment is somewhat similar to visual assessment. The choice of an appropriate normal reference site, particularly in the abdomen and pelvic area, is critical in this analysis. 

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