Measurement of tissue perfusion by dynamic computed tomography

Area of Science:

• Radiology
• Medical Imaging
• Physiology

Background:

• Dynamic computed tomography (CT) offers potential for quantitative functional imaging.
• Standard functional imaging techniques have limitations in resolving certain anatomical structures.
• Accurate quantification of tissue perfusion is crucial for understanding organ function.

Purpose of the Study:

• To describe and validate a novel method for quantifying tissue perfusion using dynamic CT.
• To demonstrate the application of this method in measuring splenic and renal perfusion.
• To highlight the potential of dynamic CT in assessing functional changes in conditions like renal failure and hypertension.

Main Methods:

• A nuclear medicine data processing technique was applied to time-density data from dynamic CT.
• Tissue perfusion was calculated using the maximum gradient of the tissue time-density curve divided by the aortic peak enhancement.
• Splenic, renal cortical, and renal medullary perfusion were measured in milliliters per minute per milliliter (ml min-1 ml-1).

Main Results:

• Splenic perfusion was quantified at 1.2 ml min-1 ml-1.
• Normal renal cortical perfusion was measured at 2.5 ml min-1 ml-1.
• Normal renal medullary perfusion was determined to be 1.1 ml min-1 ml-1.
• The method demonstrated changes in renal perfusion associated with renal failure and hypertension.

Conclusions:

• Dynamic CT can provide valuable quantitative functional information, particularly for structures not resolved by standard methods.
• This perfusion quantification technique is applicable to various organs, including the spleen and kidneys.
• The method shows promise for studying functional changes in disease states affecting tissue perfusion.