Table 1.
Proportion of Visible Nodules on PET and MR Images with Pre- and Post-contrast VIBE Sequences.
Fig 1.
An example of the invisible nodule on PET/MR images (57-year-old man with pancreatic cancer).
A tiny nodule (3 mm) is identified (arrow) in the right middle lobe on the CT image (A). This lesion is not visible on pre-contrast VIBE (B) and post-contrast VIBE (C) images. None of the readers were able to identify this nodule during the first and second sessions. This lesion is not visible on PET (D) images due to non-FDG-avidity.
Table 2.
Comparison of Nodule Detection Rates on PET and PET/MR Images during the first (without post-contrast VIBE) and second sessions (with post-contrast VIBE).
Fig 2.
An example of the FDG-avid nodule on PET/MR images (67-year-old man with lung cancer).
The primary lung cancer lesion (arrow) is seen on CT image (A), pre-contrast VIBE (B) and post-contrast VIBE (C) images. This nodule (arrow) is also well-delineated as an FDG-avid nodule in the left upper lobe on PET (D) and fused PET/MR images (E).
Fig 3.
An example of the non-FDG-avid nodule on PET/MR images (68-year-old man with lung cancer).
On CT image (A), a tiny nodule (3 mm) is identified (arrow) in the right upper lobe. This lesion is also visible on pre-contrast VIBE (B) and post-contrast VIBE (C) images. Both readers identified this nodule during both the first and second sessions. However, this lesion is not visible on PET (D) images due to non-FDG-avidity.
Table 3.
Comparison of FOMs on PET/MR Images during the first (without post-contrast VIBE) and second sessions (with post-contrast VIBE).