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Related Experiment Videos

Multiple slice FLASH imaging: an improved pulse sequence for contrast enhanced MR brain studies.

W Schörner1, B Sander, H Henkes

  • 1Department of Radiology, Klinikum Rudolf Virchow, Free University of Berlin, Federal Republic of Germany.

Neuroradiology
|January 1, 1990
PubMed
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Gradient echo sequences (FLASH) offer faster contrast-enhanced brain imaging than conventional spin-echo (SE) techniques. Diagnostic results were equivalent, making FLASH ideal for speeding up MRI studies.

Area of Science:

  • Neuroradiology
  • Magnetic Resonance Imaging (MRI)

Background:

  • Contrast-enhanced MRI is crucial for diagnosing intracranial lesions.
  • Conventional spin-echo (SE) sequences are time-consuming for contrast-enhanced brain studies.

Purpose of the Study:

  • To compare the diagnostic value of multi-slice gradient echo (FLASH) sequences with conventional spin-echo (SE) for contrast-enhanced brain imaging.
  • To evaluate the efficiency and image quality of FLASH sequences in patients with intracranial lesions.

Main Methods:

  • Fifty patients with contrast-enhancing intracranial lesions underwent MRI at 0.5 Tesla.
  • Both SE (400/30) and FLASH (315/14, 90 degrees) sequences were used before and after Gd-DTPA administration.
  • Image analysis included visual and quantitative assessment of contrast enhancement, lesion contrast, and delineation.

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Main Results:

  • Diagnostic results for postcontrast SE and FLASH images were equivalent in contrast enhancement, lesion/brain contrast, lesion/edema contrast, and lesion delineation.
  • FLASH sequences demonstrated significantly higher efficiency, acquiring more images in less time (15 images/1.4 min vs. 4 images/3.4 min).
  • While susceptibility artifacts were more severe on FLASH, they did not compromise diagnostic information except in postoperative patients with metallic implants.

Conclusions:

  • Multi-slice gradient echo (FLASH) sequences are a valuable, efficient alternative to conventional spin-echo (SE) for contrast-enhanced brain imaging.
  • The higher efficiency of FLASH allows for faster MRI studies without compromising diagnostic accuracy for intracranial lesions.
  • FLASH sequences can significantly speed up contrast-enhanced brain imaging procedures.