TRIPLE ENERGY WINDOW SCATTER CORRECTION TECHNIQUE IN PET

A practical triple energy window technique (TEW) if proposed, which is based on using the information in two lower energy windows and one si ngle calibration, to estimate the scatter within the photopeak window. The technique is basically a conventional dual-window technique plus a modification factor, which can partially compensate object-distribut ion dependent scatters. The modification factor is a function of two l ower scatter windows of both the calibration phantom and the actual ob ject. In order to evaluate the technique, a Monte Carlo simulation pro gram, which simulates the PENN-PET scanner geometry, was used. Differe nt phantom activity distributions and phantom sizes were tested to sim ulate brain studies, including uniform and nonuniform distributions. T he results indicate that the TEW technique works well for a wide range of activity distributions and object sizes. The comparisons between t he TEW and dual window techniques show better quantitative accuracy fo r the TEW, especially for different phantom sizes. The technique is al so applied to experimental data from a PENN-PET scanner to test its pr acticality.