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The imaging process provides the most time-efficient sequence with the highest lesion detection rate and conspicuity.
Gadolinium-enhanced T1-weighted volumetric interpolated breath-hold exam (VIBE) is best for detecting prostate cancer metastases, according to a study published in the American Journal of Roentgenology.
Researchers from Canada performed a prospective study to compare the diagnostic value of various MRI sequences used for whole-body (WB) 18F-fluorocholine (FCH) PET/MRI staging of patients with high-risk prostate cancer. The study included 58 patients with untreated high-risk prostate cancer. Ten patients underwent integrated WB FCH PET/MRI; 48 underwent FCH PET/CT and WB MRI. The researchers recorded metastatic sites and used histopathologic findings or clinical and imaging follow-up (or both) for standard of reference.
The results showed the gadolinium-enhanced T1-weighted volumetric interpolated breath-hold exam (VIBE) was the best of the four sequences:
|Dixon T1-weighted||1 min. 25 sec.||88.3% (68/77)||62.3% (48/77)|
|Turbo inversion recovery magnitude||15 min. 7 sec.||94.8% (73/77)||88.3% (68/77)|
|WB DWI||16 min. 33 sec.||95.2% (40/42)||90.5% (38/42)|
|Gadolinium-enhanced T1-weighted VIBE||1 min. 28 sec.||97.4% (75/77)||92.2% (71/77)|
Conspicuity of metastases on gadolinium-enhanced T1-weighted VIBE and WB DWI sequences was higher than that on Dixon T1-weighted sequences.
The researchers concluded that metastases from prostate cancer are best detected at DWI or gadolinium-enhanced T1-weighted VIBE sequences. The most time-efficient sequence with the highest lesion detection rate and conspicuity is gadolinium-enhanced T1-weighted VIBE.