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British Journal of Radiology (2007) 80, 12-20
© 2007 British Institute of Radiology
doi: 10.1259/bjr/11148990
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A clinical MRI investigation of the relationship between kidney volume measurements and renal function in patients with renovascular disease

S J Gandy, PhD 1,2 K Armoogum, MSc 2 R S Nicholas, PhD 1,2 T B McLeay, MSc 1 and J G Houston, FRCR 1

1 Clinical Radiology, 2 Medical Physics, NHS Tayside, Ninewells Hospital, Dundee DD1 9SY, UK


Figure 1
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  		Figure 1. (a) A maximum intensity projection (MIP) image highlighting moderate (category 2, 31-70%) right renal artery stenosis (RAS) and severe (category 3, 71-100%) left RAS, together with (b) a representative central slice of a post-contrast (early venous phase) dataset. (c) The signal intensity threshold technique and associated region of interest (ROI) selection is illustrated, where the cortical volume is calculated using pixel counting. (d) The final reconstructed volume is highlighted, where the right kidney is relatively enlarged (226.1 cm3) and the left kidney is relatively small (77.4 cm3).

 

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  		Figure 2. Mean kidney lengths and cortical/total kidney volumes, as subdivided by renal artery stenosis (RAS) category. The mean kidney volumes were reduced by 37% (cortical) and 32% (total) between those patients with moderate RAS and those with severe RAS, whereas the mean kidney length was only reduced by 14%.

 

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  		Figure 3. Correlation of combined cortical volumes with(i) CG-GFR values and (ii) NM-GFR values for individual patients.

 

Figure 4
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  		Figure 4. Variation of contralateral and ipsilateral cortical volumes with glomerular filtration rate for kidneys with differing degrees of renal artery stenosis.

 




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