Table 1.
Demographic and clinical data of patients.
Table 2.
Comparison of the detection rate of each modality.
Table 3.
Comparison of integrated imaging on a per-lesion basis.
Figure 1.
A 62-year-old female with history of breast cancer resection with a solitary liver nodule in follow-up study.
T1WI (B), T2WI-FS (D) and CT (F) showed the well-moderate differentiated hepatocellular carcinoma (arrows), whereas PET (A, C, and E) did not show abnormal uptake of fluorodeoxyglucose (FDG).
Figure 2.
In a 52-year-old male, a right renal nodule was incidentally found by PET/MRI, and the renal lesion was later proven to be a renal cell carcinoma, Fuhrman II grade.
T2WI-FS showed the lesion (B, arrow) much better than T1WI (D) and CT (F); PET (A, C, and E) was false negative.
Figure 3.
A 67-year-old male underwent imaging for highly suspected lung cancer.
T2WI-FS (A), T1WI (C) and CT (E) showed the main lesion at the right lung, whereas small satellite nodules (arrow) were detected by CT alone. Mild FDG uptake was observed on PET images (B, D, and F). The lesion was later confirmed to be a tuberculous granuloma.
Figure 4.
Representative cases of PET/MRI.
In a 52-year-old symptom-free male, ultrasonography incidentally revealed a dilated bile duct and CT a dilated common bile duct. T2WI-FS outlined a mass inside the dilated bile duct (arrow head), which was later removed by surgery and the lesion was proven to be an epithelial cancer of bile duct origin (A). An right renal pelvic mass was better delineated against hot urine on T2WI-FS in a 60-yr-old woman; an invasive ureteral epithelium carcinoma was later proved by surgery (cross, B).
Table 4.
Detection rate of PET/CT and PET/MRI in various body regions.
Figure 5.
Correlation of FDG-positive foci SUVmax between PET/CT and PET/MRI.
Figure 6.
“Hot trachea” artifact on PET/MRI images.
The “hot trachea” artifact present on MRI-based FDG-PET images (A and B, arrow) compared with CT-based PET image (C). Structural images of T2WI-FS (D), T1WI (E), and CT (F) images showing the corresponding levels of trachea lumen. Although increased radioactivity (arrow head) was found in the transaxial MRI-based PET image (G), the maximum intensity projection (I) seemed clear. A similar artifact (arrow head) was noted, although less intense, in the non-AC images for the same subject (H and J).