The effect of PET/CT images on SUV with the correction of

Objectives Combining the PET with CT, it is not only possible to offer the higher resolution but also effectively shorten the scanning time by using CT data in attenuation correction. In the CT scanning, furthermore, the contrast media makes it easier to determine exact range of the lesion among the normal organs. I n the case of using the contrast media, however, it affects semi-quantitative measures of the PET/CT images. In this study, therefore, we establish the reliability of the SUV with CT data correction so that it gives more accurate diagnosis.

Methods The study enrolled 30 patients (range 27 – 72y). DSTe (GE Healthcare) is used for equipment. The injection dose of ¹⁸F-FDG ranged from 370~555 MBq. The CT scan is set to 140kV, 210mA and the contrast media was injected 2cc per 1kg of the patients' weight. With the raw data from the scan, we obtain image showing the effect of the contrast media through the attenuation correction by both of the corrected and uncorrected CT data. Then we measure SUV and analyze the difference.

Results According to the analysis, the SUV is decreased in the liver and heart which have more bloodstream than the others, because of the contrast media correction. On the other hand, there is no difference in the lungs.

Conclusions In this research, we measure the variation of SUV through the correction of the influence of contrast media and compare the differences. As we revise the SUV which is increasing in the image with attenuation correction by using contrast media, we can expect anatomical images of high-resolution. Furthermore, it is considered that through this trusted semi-quantitative method, it will definitely enhance the diagnostic value.