Tear transit time evaluation using real-time technique for dynamic MR dacryocystography.

Area of Science:

• Ophthalmology
• Radiology
• Medical Imaging

Background:

• Accurate assessment of the lacrimal drainage system (LDS) is crucial for diagnosing and managing various ocular conditions.
• Traditional dacryocystography methods may have limitations in dynamic assessment and real-time physiological evaluation of the LDS.

Purpose of the Study:

• To evaluate the effectiveness of a novel dynamic magnetic resonance dacryocystography (MRDCG) technique.
• To assess the transit times of contrast material through the lacrimal drainage system (LDS) in asymptomatic individuals.

Main Methods:

• Dynamic MRDCG was performed on 26 patent LDS in 13 normal individuals using a 3D spoiled gradient recalled acquisition sequence on a 1.5T MR scanner.
• Diluted gadolinium contrast was instilled into the eyes, and images were acquired every 9.4 seconds for 10 minutes.
• Transit times for contrast appearance in the lacrimal sac, nasolacrimal duct (NLD), and inferior meatus (IM) were measured.

Main Results:

• Dynamic MRDCG successfully visualized contrast outflow in all subjects, providing good structural delineation of the LDS.
• Mean transit times were 15.2s to the lacrimal sac, 50.4s to the NLD, and 150.5s to the IM.
• Contrast reached the IM within 2 minutes in 62% of systems, with no significant side-to-side differences observed.

Conclusions:

• Dynamic MRDCG using a real-time 3DSPGR sequence is a reliable method for the structural and physiological assessment of the LDS.
• This technique offers potential for further investigation into the physiology and pathologies of the lacrimal drainage system.