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Renal Adiposity Does not Preclude Quantitative Assessment of Renal Function Using Dual-Energy Multidetector CT in Mildly Obese Human Subjects.
Ferguson, Christopher M; Eirin, Alfonso; Michalak, Gregory J; Hedayat, Ahmad F; Abumoawad, Abdelrhman M; Saad, Ahmed; Zhu, Xiangyang; Textor, Stephen C; McCollough, Cynthia H; Lerman, Lilach O.
Afiliación
  • Ferguson CM; Division of Nephrology and Hypertension, Mayo Clinic, 200 First St SW, Rochester, MN.
  • Eirin A; Division of Nephrology and Hypertension, Mayo Clinic, 200 First St SW, Rochester, MN.
  • Michalak GJ; Department of Radiology, Mayo Clinic, Rochester, Minnesota.
  • Hedayat AF; Division of Nephrology and Hypertension, Mayo Clinic, 200 First St SW, Rochester, MN.
  • Abumoawad AM; Division of Nephrology and Hypertension, Mayo Clinic, 200 First St SW, Rochester, MN.
  • Saad A; Division of Nephrology and Hypertension, Mayo Clinic, 200 First St SW, Rochester, MN.
  • Zhu X; Division of Nephrology and Hypertension, Mayo Clinic, 200 First St SW, Rochester, MN.
  • Textor SC; Division of Nephrology and Hypertension, Mayo Clinic, 200 First St SW, Rochester, MN.
  • McCollough CH; Department of Radiology, Mayo Clinic, Rochester, Minnesota.
  • Lerman LO; Division of Nephrology and Hypertension, Mayo Clinic, 200 First St SW, Rochester, MN. Electronic address: lerman.lilach@mayo.edu.
Acad Radiol ; 26(11): 1488-1494, 2019 11.
Article en En | MEDLINE | ID: mdl-30655055
RATIONALE AND OBJECTIVES: Multidetector computed tomography (MDCT) is useful for measuring in the research setting single-kidney perfusion and function using iodinated contrast time-attenuation curves. Obesity promotes deposition of intrarenal fat, which might decrease tissue attenuation and thereby interfere with quantification of renal function using MDCT. The purpose of this study was to test the hypothesis that background subtraction adequately accounts for intrarenal fat deposition in mildly obese human subjects during renal contrast enhanced dynamic CT. MATERIALS AND METHODS: We prospectively recruited seventeen human subjects stratified as lean or mildly obese based on body mass index below or over 30 kg/m2, respectively. Renal perfusion was quantified from CT-derived indicator-dilution curves after background subtraction. Dual-energy MDCT images were postprocessed to generate iodine and virtual-noncontrast datasets, and the ratios between kidney/aorta CT numbers and iodine values calculated as surrogates of renal function. RESULTS: Subcutaneous adipose tissue was increased in obese subjects. Virtual-noncontrast maps revealed in obese patients a decrease in basal cortical and medullary attenuation. Overall, basal attenuation inversely correlated with body mass index, in line with renal fat deposition. Contrarily, the kidney/aorta CT attenuation (after background subtraction) and kidney/aorta iodine ratios were similar between lean and obese subjects and correlated directly. These observations show that following background subtraction, the CT number reliably reflects basal tissue attenuation. CONCLUSION: Therefore, our findings support our hypothesis that background subtraction enables reliable assessment of kidney function in mildly obese subjects using MDCT, despite decreased basal attenuation due to renal adiposity.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Índice de Masa Corporal / Tejido Adiposo / Adiposidad / Tomografía Computarizada Multidetector / Tasa de Filtración Glomerular / Riñón / Obesidad Límite: Aged / Female / Humans / Male Idioma: En Revista: Acad Radiol Asunto de la revista: RADIOLOGIA Año: 2019 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Índice de Masa Corporal / Tejido Adiposo / Adiposidad / Tomografía Computarizada Multidetector / Tasa de Filtración Glomerular / Riñón / Obesidad Límite: Aged / Female / Humans / Male Idioma: En Revista: Acad Radiol Asunto de la revista: RADIOLOGIA Año: 2019 Tipo del documento: Article Pais de publicación: Estados Unidos