Orbital lesions: proton spectroscopic phase-dependent contrast MR imaging

Area of Science:

• Radiology
• Medical Imaging
• Ophthalmology

Background:

• Orbital lesions present diagnostic challenges.
• Conventional magnetic resonance (MR) imaging has limitations in characterizing orbital lesions.
• Differentiating lesion components and extent is crucial for accurate diagnosis and treatment.

Purpose of the Study:

• To evaluate the utility of phase-dependent proton spectroscopic imaging in assessing orbital lesions.
• To compare the performance of spectroscopic imaging with conventional spin-echo MR imaging.
• To determine the advantages of spectroscopic imaging for lesion delineation and characterization.

Main Methods:

• Retrospective evaluation of 13 orbital lesions in 12 patients.
• Utilized both conventional spin-echo MR imaging and phase-dependent proton spectroscopic imaging.
• Phase-dependent proton spectroscopic imaging leverages differences in water and fat proton resonant frequencies for simultaneous chemical shift information.

Main Results:

• Spectroscopic images demonstrated enhanced lesion delineation and superior anatomic definition, particularly for orbital apex involvement.
• Improved characterization of high-intensity hemorrhage was achieved with a single pulse sequence.
• Elimination of chemical shift misregistration artifact and better clarification of intravascular flow abnormalities were observed.
• Enhanced apparent intralesional contrast was noted.

Conclusions:

• Phase-dependent proton spectroscopic imaging provides significant advantages over conventional MR imaging for evaluating orbital lesions.
• This technique offers improved diagnostic accuracy through better lesion definition, specific characterization, and artifact reduction.
• Spectroscopic imaging is a valuable tool for comprehensive assessment of orbital pathologies.