Abstract
Microscopy coil MR imaging of the orbits has been described previously as a technique for anatomic depiction. In the first part of this 2-part series, the improvement in spatial resolution that the technique offers compared with conventional MR imaging of the orbits is demonstrated. We provide a guide to implementing the technique, sharing pearls and pitfalls gleaned from our own practice to make implementation of microscopy coil MR imaging at your own center easy. As a quick reference guide to the small-scale structures encountered when reading the studies, a short anatomy section is included, which doubles as a showcase for the high-quality imaging that can be obtained. In the second part, our experience of microscopy coil MR imaging in day-to-day clinical practice takes it far beyond being a useful anatomic educational tool. Through a series of interesting cases, we highlight the added benefit of microscopy coil MR imaging compared with standard orbital MR imaging.
Highlights
Imaging of orbital and periorbital structures and pathologies presents challenges due to the various limitations intrinsic to ultrasound, CT, and conventional MR imaging.[1,2] Management of structural pathology in and around the orbit is guided by knowledge of the compartments involved and the tissue of origin.[3] Both the initial surgical approach[4] and subsequent reconstruction techniques are influenced by factors that can only be resolved at a very small scale, sometimes at submillimeter resolution
In Part 2, in addition to using MC-MR imaging as a tool for anatomic depiction, we explore the benefits of using MC-MR imaging in everyday clinical practice
For lesions that extend beyond the orbital apex, MC-MR imaging can be used in conjunction with conventional MR imaging, which can lengthen the overall examination time but may still provide useful additional information
Summary
Imaging of orbital and periorbital structures and pathologies presents challenges due to the various limitations intrinsic to ultrasound, CT, and conventional MR imaging.[1,2] Management of structural pathology in and around the orbit is guided by knowledge of the compartments involved and the tissue of origin.[3] Both the initial surgical approach[4] and subsequent reconstruction techniques are influenced by factors that can only be resolved at a very small scale, sometimes at submillimeter resolution. We have previously described the application of MC-MR imaging in preoperative planning for Mohs micrographic surgery for nasofacial skin neoplasms.[2] Collaboration with ophthalmic surgeons has extended our practice to provide high-resolution imaging of the orbits and surrounding structures.
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