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MR Angiography of the Renal Arteries: Intraindividual Comparison of Double-Dose Contrast Enhancement at 1.5 T with Standard Dose at 3 T

Christoph U. Herborn1,2, Val M. Runge1, David M. Watkins1, Jilene M. Gendron1 and L. Gill Naul1

1 Department of Radiology, Scott and White Clinic and Hospital, Temple, TX.
2 Present address: Medical Prevention Center Hamburg, Medical University Center Hamburg-Eppendorf, Falkenried 88, 20251 Hamburg, Germany.


Figure 1
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  		Fig. 1 —Gradient-recalled echo MR images (TR/TE, 3.44/1.17; flip angle, 25°) show vials containing increasing concentrations of gadodiamide at 1.5 T and 3 T. Numerals in top row represent concentration in moles per liter.

 

Figure 2
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  		Fig. 2 —Signal-to-noise ratio (SNR) plots of vials containing increasing concentrations of gadodiamide at 1.5 T (triangles) and 3 T (squares). Parameters of gradient-recalled echo sequence were TR/TE of 3.44/1.17 with flip angle of 25°. Decrease in signal intensity at concentrations greater than 2.5 mol/L (1.5 T) and 10 mol/L (3 T) is evident.

 

Figure 3
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  		Fig. 3A —61-year-old man with suspected renal arterial stenosis. Anteroposterior maximum intensity projections of coronal 3D MR angiograms of abdominal aorta and renal arteries obtained with 0.2 mmol/kg of gadodiamide at 1.5 T (A) and 0.1 mmol/kg of gadodiamide at 3 T (B) show main renal arteries equally well. Intraparenchymal branches are better depicted with double dose at 1.5 T (A).

 

Figure 4
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  		Fig. 3B —61-year-old man with suspected renal arterial stenosis. Anteroposterior maximum intensity projections of coronal 3D MR angiograms of abdominal aorta and renal arteries obtained with 0.2 mmol/kg of gadodiamide at 1.5 T (A) and 0.1 mmol/kg of gadodiamide at 3 T (B) show main renal arteries equally well. Intraparenchymal branches are better depicted with double dose at 1.5 T (A).

 

Figure 5
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  		Fig. 4A —68-year-old man with severe stenosis of left renal artery. Anteroposterior maximum intensity projections of coronal 3D MR angiograms of abdominal aorta and renal arteries obtained with 0.2 mmol/kg of gadodiamide at 1.5 T (A) and 0.1 mmol/kg of gadodiamide at 3 T (B) show stenosis (arrow) equally well.

 

Figure 6
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  		Fig. 4B —68-year-old man with severe stenosis of left renal artery. Anteroposterior maximum intensity projections of coronal 3D MR angiograms of abdominal aorta and renal arteries obtained with 0.2 mmol/kg of gadodiamide at 1.5 T (A) and 0.1 mmol/kg of gadodiamide at 3 T (B) show stenosis (arrow) equally well.

 

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