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[Magnetic resonance myelography with a fast-spin-echo sequence]

T Scarabino1, G M Giannatempo, F Perfetto

  • 1Dipartimento di Diagnostica per Immagini, IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Foggia.

La Radiologia Medica
|March 1, 1996
PubMed
Summary

Magnetic Resonance Imaging (MRI) myelography uses fast spin echo (FSE) sequences to create 3D images of the spine. This noninvasive technique aids in diagnosing lumbar spine conditions like disk herniation.

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Area of Science:

  • Radiology
  • Medical Imaging

Background:

  • Magnetic Resonance Imaging (MRI) utilizes the "myelographic effect" to visualize cerebrospinal fluid (CSF) and nerve root sheaths.
  • Ultrafast pulse sequences, such as fast spin echo (FSE), enhance CSF signal intensity for improved visualization.

Purpose of the Study:

  • To assess the clinical utility and reliability of 3D MR myelography.
  • To evaluate FSE sequences combined with fat suppression and maximum intensity projection (MIP) for generating myelography-like images.

Main Methods:

  • Preliminary study involving 21 patients and 5 healthy volunteers using a 1.5-T MR system.
  • Acquisition of MR myelography sequences with specific parameters (TR=6000, TE=200, ETL=32, 3mm slice thickness) after standard FSE T1/T2-weighted MRI.
  • Utilized fat presaturation and MIP algorithm for enhanced 3D visualization.

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Main Results:

  • MR myelography confirmed diagnoses of disk herniation, particularly thecal sac compression and nerve root sheath amputation.
  • Effectively visualized migrated disk herniation and abnormal nerve root origins.
  • Provided panoramic views of subarachnoid spaces with excellent definition of thecal sac and nerve roots.

Conclusions:

  • MR myelography is a valuable, noninvasive adjunct to conventional lumbar spine MRI.
  • It offers an easy, rapid, and reliable method for visualizing spinal anatomy, potentially replacing conventional myelography.
  • While lacking functional information, it excels in anatomical detail and diagnosis of specific pathologies.