Fig. 3

Comparison of quantitative image quality parameters (\(\:{\text{I}\text{U}\text{I}}_{\text{L}\text{i}\text{v}\text{e}\text{r}}\) and \(\:{\text{S}\text{N}\text{R}}_{\text{L}\text{i}\text{v}\text{e}\text{r}}\)) of different PET reconstruction algorithms (OSEM and DPL) in patients with varying BMI categories. a–b indicates the value of \(\:{\text{I}\text{U}\text{I}}_{\text{L}\text{i}\text{v}\text{e}\text{r}}\) and \(\:{\text{S}\text{N}\text{R}}_{\text{L}\text{i}\text{v}\text{e}\text{r}}\) in underweight, normal and overweight patients, respectively. The closer the \(\:{\text{I}\text{U}\text{I}}_{\text{L}\text{i}\text{v}\text{e}\text{r}}\) value is to 1, the better the uniformity of the image, indicating higher image quality. Conversely, the farther the \(\:{\text{I}\text{U}\text{I}}_{\text{L}\text{i}\text{v}\text{e}\text{r}}\:\)value is from 1, the greater the image noise and the poorer image quality. In addition, a higher \(\:{\text{S}\text{N}\text{R}}_{\text{L}\text{i}\text{v}\text{e}\text{r}}\) indicates better image quality. UW = underweight, N = normal and O = overweight. *** indicates P < 0.001