Cardiac magnetic resonance imaging using an open 0.35 T system.
OBJECTIVE
To evaluate cardiac magnetic resonance imaging (MRI) using a 0.35 T magnetic resonance system with open design.


METHODS
Eleven patients were examined in an open MRI system with a field strength of 0.35 T. Myocardial function was assessed with cine true fast imaging with steady-state precession sequences in 2 planes. Perfusion images were acquired with a T1-weighted gradient echo sequence. Late enhancement was performed using an inversion recovery-prepared fast gradient echo technique. Image quality was assessed using a 4-point score in consensus. Signal-noise ratio was measured.


RESULTS
For functional imaging, average score was 1.65 (SD, 0.6). For perfusion imaging, the value was 2.25 (SD, 0.68). For late enhancement, quality score was 2.6 (SD, 0.82). Average value of signal-noise ratio for functional, perfusion, and late enhancement imaging was 50.6 (SD, 16.4), 91.8 (SD, 52.8), and 33.2 (SD, 20.4), respectively.


CONCLUSIONS
Open MRI with lower field strength can be used for functional imaging of the heart. For perfusion and viability imaging (late enhancement), higher field strength is needed. Open low-field cardiac MRI may provide a helpful alternative for obese or claustrophobic patients or patients who are difficult to move.
Klein
Hans-Martin
HM
Radiological Center, Ev. Jung-Stilling-Krankenhaus Siegen, Wichernstrasse, Siegen, Germany. hans-martin.klein@diakonie-siegen.de
Meyners
Werner
W
Neeb
Benjamin
B
Labenz
Joachim
J
Truümmler
Karl-Heinz
KH
D000368:Aged; D000369:Aged, 80 and over; D016477:Artifacts; D002318:Cardiovascular Diseases / Q000175:diagnosis*; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods*; D008297:Male; D008875:Middle Aged
D003287:Contrast Media; D019786:Gadolinium DTPA