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Arterial fraction of cerebral blood volume in humans measured by positron emission tomography

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Abstract

In quantitative functional neuroimaging with positron emission tomography (PET) and magnetic resonance imaging (MRI), cerebral blood volume (CBV) and its three components, arterial, capillary, and venous blood volumes are important factors. The arterial fraction for systemic circulation of the whole body has been reported to be 20–30%, but there is no report of this fraction in the brain. In the present study, we estimated the arterial fraction of CBV with PET in the living human brain. C15O and dynamic H2 15O PET studies were performed in each of seven, healthy subjects to determine the CBV and arterial blood volume (Va), respectively. A two-compartment model (influx: K1, efflux: k2) that takes Va into account was applied to describe the regional time-activity curve of dynamic H2 15O PET. K1, k2 and Va were calculated by a non-linear least squares fitting procedure. The Va and CBV values were 0.011±0.004 ml/ml and 0.031± 0.003 ml/ml (mean±SD), respectively, for cerebral cortices. The arterial fraction of CBV was 37%. Considering the limited first-pass extraction fraction of H2 15O, the true arterial fraction of CBV is estimated to be about 30%. The estimated arterial fraction of CBV was quite similar to that of the systemic circulation, whereas it was greater than that (16%) widely used for the measurement of cerebral metabolic rate of oxygen (CMRO2) using PET. The venous plus capillary fraction of CBV was 63–70% which is a important factor for the measurement of CMRO2 with MRI.

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Authors and Affiliations

  1. Department of Radiology and Nuclear Medicine, Akita Research Institute of Brain and Blood Vessels, 6-10 Senshu-kubota-machi, 010-0874, Akita, Japan

    Hiroshi Ito, Iwao Kanno, Hidehiro Iida, Jun Hatazawa, Eku Shimosegawa, Hajime Tamura & Toshio Okudera

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  1. Hiroshi Ito
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  2. Iwao Kanno
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  3. Hidehiro Iida
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  4. Jun Hatazawa
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  5. Eku Shimosegawa
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  6. Hajime Tamura
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  7. Toshio Okudera
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Correspondence to Hiroshi Ito.

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Ito, H., Kanno, I., Iida, H. et al. Arterial fraction of cerebral blood volume in humans measured by positron emission tomography. Ann Nucl Med 15, 111–116 (2001). https://doi.org/10.1007/BF02988600

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  • DOI: https://doi.org/10.1007/BF02988600

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