Abstract
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 contribution | True FISP keyhole: Fast T2 weighted imaging for interventional MRI at 0.2 T |
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Original language | German |
Pages (from-to) | 391-393 |
Number of pages | 3 |
Journal | RoFo Fortschritte auf dem Gebiete der Rontgenstrahlen und der Neuen Bildgebenden Verfahren |
Volume | 170 |
Issue number | 4 |
State | Published - Apr 1999 |
Externally published | Yes |
Keywords
- Fast MR imaging
- Interventional MRI
- Keyhole
- True FISP
ASJC Scopus subject areas
- Radiological and Ultrasound Technology
- Radiology Nuclear Medicine and imaging