3D MR angiography of the entire aorta: modified application of the body-phased array coil for a single-shot technique.
OBJECTIVE
Evaluation of different contrast-enhanced MR angiography imaging protocols for visualization of the entire aorta in breath-hold technique.


METHODS
Three different CE (0.15 mmol/kg) MRA protocols were evaluated by phantom and patient studies: (1) two separate MRA with conventional application of the body-phased array coil; (2) a single-shot MRA with modified application of the body-phased array coil; (3) a single-shot MRA with the body coil. Duplex sonography, CTA and DSA were used as standard of reference.


RESULTS
In all examinations the entire aorta could be visualized. The best SNR was acquired with protocol (1). The SNR of protocol (2) was reduced if the sagittal body diameter of the patient was greater than 20 cm and decreased significantly with diameters over 30 cm. By the use of protocol (3) the SNR was notably poor. The quality scored for the visualization of the entire aorta was 97.5% (protocol 1); 92.5% (protocol 2); and 80.0% (protocol 3).


CONCLUSIONS
In most cases the modified application of the body-phased array coil allows the imaging of the entire aorta as a single-shot 3D CE MRA in diagnostic quality.
Rodenwaldt
J
J
Department of Radiology, Georg-August-Universität Göttingen, Germany. jrodenw@med.uni-goettingen.de
Kopka
L
L
Vosshenrich
R
R
Fischer
U
U
Grabbe
E
E
D000293:Adolescent; D000328:Adult; D000368:Aged; D000784:Aortic Dissection / Q000175:diagnosis; D015901:Angiography, Digital Subtraction; D001014:Aortic Aneurysm / Q000175:diagnosis; D001017:Aortic Coarctation / Q000175:diagnosis; D001018:Aortic Diseases / Q000175:diagnosis*; D001824:Body Constitution; D003287:Contrast Media; D005240:Feasibility Studies; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation / Q000379:methods; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D018810:Magnetic Resonance Angiography / Q000295:instrumentation / Q000379:methods*; D008297:Male; D008875:Middle Aged; D019047:Phantoms, Imaging; D014057:Tomography, X-Ray Computed / Q000379:methods; D018616:Ultrasonography, Doppler, Duplex
D003287:Contrast Media; D019786:Gadolinium DTPA