Development and reproducibility of a computed tomography-based measurement of renal sinus fat

• Published in: BMC nephrology Vol. 12; no. 1; p. 52
• Main Authors: Foster, Meredith C, Hwang, Shih-Jen, Porter, Stacy A, Massaro, Joseph M, Hoffmann, Udo, Fox, Caroline S
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 04.10.2011; BioMed Central; BMC
• Subjects: Adiposity; Adult; Aged; Aged, 80 and over; Body Fat Distribution - methods; Body Fat Distribution - standards; Body Fat Distribution - statistics & numerical data; Chronic kidney failure; CT imaging; Diagnosis; Feasibility Studies; Female; Hospitals; Humans; Hypertension; Intra-Abdominal Fat - diagnostic imaging; Kidney - diagnostic imaging; Male; Measurement; Medical imaging; Middle Aged; Nephrology; Obesity; Obesity - diagnostic imaging; Observer Variation; Public health; Reproducibility of Results; Rodents; Sinuses; Technical Advance; Tomography, X-Ray Computed - methods; Tomography, X-Ray Computed - standards; Tomography, X-Ray Computed - statistics & numerical data; Work stations; United States
• ISSN: 1471-2369; 1471-2369
• DOI: 10.1186/1471-2369-12-52

Renal sinus fat may mediate obesity-related vascular disease, although this fat depot has not been assessed in a community-based sample. We sought to develop a protocol to quantify renal sinus fat accumulation using multi-detector computed tomography (MDCT). Protocol development was performed in participants in the Framingham Offspring cohort who underwent MDCT. Volumetric renal sinus fat was measured separately within the right and left kidneys, and renal sinus fat area within a single MDCT scan slice was measured in the right kidney. Due to the high correlation of volumetric and single-slice renal sinus fat in the right kidney (Pearson correlation [r] = 0.85, p < 0.0001), we optimized a single-slice protocol to capture renal sinus fat in the right kidney alone. Pearson correlation coefficients were used to compare to assess the correlation of volumetric and single-slice renal sinus fat in the right kidney with other measures of adiposity. Inter- and intra-reader reproducibility was assessed using intra-class correlation coefficients. Single-slice measurements were obtained in 92 participants (mean age 60 years, 49% women, median renal sinus fat 0.43 cm2). Intra- and inter-reader intra-class correlation coefficients were 0.93 and 0.86, respectively. Single-slice renal sinus fat was correlated with body mass index (r = 0.35, p = 0.0006), waist circumference (r = 0.31, p = 0.003), and abdominal visceral fat (r = 0.48, p < 0.0001). Similar correlations were observed for volumetric renal sinus fat in the right kidney. Measuring renal sinus fat is feasible and reproducible using MDCT scans in a community-based sample.