Keyhole-true-FISP: Schnelle T2-gewichtete bildgebung fur die interventionelle MRT bei 0,2 T

Translated title of the contribution: True FISP keyhole: Fast T2 weighted imaging for interventional MRI at 0.2 T

M. Wendt, F. Wacker, K. J. Wolf, J. S. Lewin, J. L. Duerk

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Purpose: The aim of this study is to introduce a fast, T2 weighted true FISP keyhole sequence implemented on an open C arm low field magnetic resonance (MR) scanner for interventional procedure guidance. Method: Following the acquisition of a reference data set using a true FISP (fast Imaging with Steady Precission) sequence, only the 32 central raw data lines (keyhole) are acquired in a fluoroscopic-like mode enabling continuous image reconstruction and update. The keyhole true-FISP sequence was tested in animal experiments and used in MR-guided interventions in 10 patients. Results: The described true FISP keyhole sequence is characterized by an image frame rate of 2.5 images per second and a T2-like contrast. Due to system constraints with respect to the reconstruction, the actual displaying of images was delayed by up to 180 ms. Conclusions: The use of the described keyhole sequence enabled a fluoroscopy-like guidance of interventional devices in an open, low-field system.

Translated title of the contributionTrue FISP keyhole: Fast T2 weighted imaging for interventional MRI at 0.2 T
Original languageGerman
Pages (from-to)391-393
Number of pages3
JournalRoFo Fortschritte auf dem Gebiet der Rontgenstrahlen und der Bildgebenden Verfahren
Issue number4
StatePublished - Apr 1999
Externally publishedYes


  • Fast MR imaging
  • Interventional MRI
  • Keyhole
  • True FISP

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging


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