Orbit, skull base, and pharynx: contrast-enhanced fat suppression MR imaging

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• T1-weighted MRI signal intensity of fat can obscure lesions in the head and neck.
• Gadolinium-based contrast agents are crucial for enhancing lesions but can be compromised by fat signal.
• Chemical misregistration artifact further complicates interpretation in these regions.

Purpose of the Study:

• To evaluate the efficacy of a gadolinium-enhanced fat suppression imaging technique.
• To compare its diagnostic performance against conventional MRI sequences for extracranial head and neck abnormalities.
• To determine the value of fat suppression in detecting specific pathologies like perineural spread.

Main Methods:

• A prospective study involving 29 patients with suspected extracranial head and neck abnormalities.
• Direct comparison of gadolinium-enhanced fat-suppressed T1-weighted sequences with conventional pre- and postcontrast T1- and T2-weighted spin-echo (SE) sequences.
• Analysis of lesion detection, extent definition, and artifact reduction.

Main Results:

• Fat-suppressed images were superior in detecting and defining abnormalities in 81% of cases (22 of 27 patients).
• Significant benefits were observed in identifying perineural tumor spread.
• Lesions within or adjacent to fat-containing areas, such as the skull base, were more clearly visualized.

Conclusions:

• Gadolinium-enhanced fat suppression MRI is a valuable tool for extracranial head and neck imaging.
• This technique offers superior visualization compared to conventional postcontrast T1-weighted SE imaging.
• Fat suppression should be considered the standard for postcontrast T1-weighted imaging in this anatomical region.