Article Figures & Data
Figures
- FIGURE 1.
Effect of body weight on SUV. Image shows whole-body 18F-FDG PET maximum-intensity projection of obese !patient (59-y-old woman; weight, 114 kg; height,165 cm; lean body mass, 59.4 kg). SUVmean in liver and blood pool are 5 and 4.1, respectively, which are above normal values and higher than visually seen activity in liver and blood pool. SUL is 2.6 in liver and 2.1 in blood pool. Overweight and obesity can also cause overestimation of SUV in lesions.
- FIGURE 2.
18F-FDG PET whole-body maximum-intensity projection and transaxial selected PET slice from liver in adult patient with erroneously low SUV (liver SUVmean, 0.4). Inaccurate entering of injected 18F-FDG activity in PET computer (3,000 MBq instead of 300 MBq) caused significantly low SUV in liver and other tissues in this patient. When measured SUV does not match visual findings, it is important to check patient data in PET computer (weight, height, and injected dose). In addition, as activity is decay-corrected for SUV, accuracy of injection and imaging start times should also be checked. Clocks used in department should be synchronized.
- FIGURE 3.
Effect of high blood glucose on brain 18F-FDG uptake in 18F-FDG PET whole-body maximum-intensity projection images. (A) A 48-y-old woman with recently diagnosed breast cancer (fasting blood glucose, 97.2 mg/dL; SUVmax in right frontal cortex, 19.6; SUVmean in liver, 3.6; SUVmean in blood pool, 3.2). (B) A 52-y-old man with pancreatic lesion (fasting blood glucose, 216 mg/dL; SUVmax in right frontal cortex, 5; SUVmean in liver, 2.7; SUVmean in blood pool, 1.5). Visually, there is diffusely decreased uptake in brain. Patient does not have cranial symptoms. Compare brain activity with liver uptake and bladder activity in both cases.
