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Proposal of blood volume-corrected model for quantification of regional cerebral blood flow with H2 15O-PET and its application to AVF

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Abstract

Purpose

It is generally assumed that vascular tracer activity is negligible in the quantification of regional cerebral blood flow (rCBF) with H2 15O and positron emission tomography (PET) under normal conditions. We attempted to surpass the assumption of abnormal vascular conditions where the vascular tracer activity is significant by introducing the vascular component into the model.

Materials and methods

H2 15O-dynamic and C15O PET scans were performed in an arteriovenous fistula (AVF) patient. Time–activity curves of regions of interest (ROIs) were analyzed with nonlinear least-square approximation to estimate the rCBF and fractional arterial blood volume (va) simultaneously with the proposed model and the standard model.

Results

The proposed model curve showed a fit to the time–activity curve of H2 15O at an ROI containing an enlarged vascular space induced by the AVF. The relation between the estimated va and CBV obtained with C15O-PET revealed that the ratio of va to CBV was approximately 0.23. The estimated rCBF with the proposed model in nonlesion ROIs corresponded to those of the standard model, with the estimated Vd 0.94 ml/ml.

Conclusion

The results supported the hypothesis that the blood volume-corrected model is applicable to the quantification of rCBF in a region with abnormal vascular structure. Furthermore, one of the advantages of the model is the feasibility of simultaneous estimation of the rCBF and arterial blood volume with dynamic-H2 15O PET scans.

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Author notes

  1. Chie Seki

    Present address: Molecular Imaging Center, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan

Authors and Affiliations

  1. Department of Radiology, Faculty of Medicine, The University of Tokyo, 3-7-1 Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan

    Chie Seki, Toshimitsu Momose, Yoshiki Kojima, Yasuto Sasaki & Kuni Ohtomo

  2. 2nd Department of Internal Medicine, Faculty of Medicine, The University of Tokyo, Tokyo, Japan

    Ikuo Yokoyama

Authors
  1. Chie Seki
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  2. Toshimitsu Momose
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  3. Yoshiki Kojima
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  4. Yasuto Sasaki
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  5. Kuni Ohtomo
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  6. Ikuo Yokoyama
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Corresponding author

Correspondence to Chie Seki.

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Seki, C., Momose, T., Kojima, Y. et al. Proposal of blood volume-corrected model for quantification of regional cerebral blood flow with H2 15O-PET and its application to AVF. Radiat Med 24, 260–268 (2006). https://doi.org/10.1007/s11604-005-1547-8

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  • DOI: https://doi.org/10.1007/s11604-005-1547-8

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