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The T:N ratio changes as more particles are delivered. For hypervascular tumors, glass results in better T:N ratio than resin. For hypovascular tumors, resin results in better T:N ratio than glass. Mean particle density over the entire treatment volume is listed for 99mTc-MAA versus 90Y-glass versus 90Y-resin, as well as T:N ratios from the regression lines in Figure 3.
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