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Functional CT of the kidney.

Y Tsushima1

  • 1Department of Radiology, Motojima General Hospital, Ohta, Gunma, Japan. yoshito@xa2.so-net.ne.jp

European Journal of Radiology
|August 19, 1999
PubMed
Summary

Dynamic computed tomography (CT) offers a non-invasive method to assess kidney function by measuring contrast agent clearance. This technique provides quantitative regional and global renal physiological data, correlating well with traditional creatinine clearance measurements.

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Area of Science:

  • Nephrology
  • Radiology
  • Medical Imaging

Background:

  • Iodinated contrast agents used in computed tomography (CT) share pharmacokinetic properties with inulin.
  • These agents are filtered by glomeruli and not reabsorbed by renal tubules, making them suitable for measuring renal function.
  • Glomerular filtration rate (GFR) is a key indicator of kidney health.

Purpose of the Study:

  • To demonstrate the utility of dynamic CT for measuring regional and global contrast material clearance in the kidneys.
  • To establish dynamic CT as a non-invasive tool for quantitative renal physiological assessment.
  • To correlate CT-derived renal clearance with established measures of kidney function.

Main Methods:

  • Sequential scanning of a single kidney slice after intravenous bolus injection of iodinated contrast agent.
  • Construction of time-attenuation curves and calculation of contrast clearance per unit volume using Patlak graphical analysis.
  • Determination of renal volume via CT and subsequent calculation of global contrast clearance.

Main Results:

  • Average contrast clearance per unit volume in normal kidneys was 0.49+/-0.11 ml min(-1) ml(-1), consistent with other methods.
  • A negative correlation was observed between patient age and clearance per unit volume.
  • A strong correlation was found between whole blood creatinine clearance and global contrast clearance derived from CT.

Conclusions:

  • Dynamic CT enables non-invasive, quantitative assessment of regional renal physiological function.
  • CT-derived global contrast clearance strongly correlates with creatinine clearance, validating its use.
  • This technique offers a valuable tool for evaluating kidney function dynamically and regionally.

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