| Popis: |
Recently, there has been increased interest in dedicated cardiac SPECT scanners with multi-pinhole designs and improved detector technology. However, the pinhole collimator design introduces position-dependent attenuation, sensitivity and resolution variations. Variations in attenuation patterns and energy-spectrum responses can also inhibit accurate measurement of activity distributions. Simple correction methods for these effects are easily implemented however their level of accuracy is unclear. In this study, we assess the quantitative accuracy and reproducibility of absolute activity measurements made using easily implemented correction techniques applied to controlled physical phantom experiments. |
