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Calibrated fMRI for dynamic mapping of CMRO2 responses using MR-based measurements of whole-brain venous oxygen saturation

Autores: Englund, E. K.; Fernández Seara, María Asunción; Rodríguez-Soto, A. E.; Lee, H.; Rodgers, Z. B.; Vidorreta, M.; Detre, J. A.; Wehrli, F. W. (Autor de correspondencia)
ISSN: 0271-678X
Volumen: 40
Número: 7
Páginas: 1501-1516
Fecha de publicación: 2020
Functional MRI (fMRI) can identify active foci in response to stimuli through BOLD signal fluctuations, which represent a complex interplay between blood flow and cerebral metabolic rate of oxygen (CMRO2) changes. Calibrated fMRI can disentangle the underlying contributions, allowing quantification of the CMRO2 response. Here, whole-brain venous oxygen saturation (Y-v ) was computed alongside ASL-measured CBF and BOLD-weighted data to derive the calibration constant, M, using the proposed Y-v -based calibration. Data were collected from 10 subjects at 3T with a three-part interleaved sequence comprising background-suppressed 3D-pCASL, 2D BOLD-weighted, and single-slice dual-echo GRE (to measure Y (v) via susceptometry-based oximetry) acquisitions while subjects breathed normocapnic/normoxic, hyperoxic, and hypercapnic gases, and during a motor task. M was computed via Y-v -based calibration from both hypercapnia and hyperoxia stimulus data, and results were compared to conventional hypercapnia or hyperoxia calibration methods. Mean M in gray matter did not significantly differ between calibration methods, ranging from 8.5 +/- 2.8% (conventional hyperoxia calibration) to 11.7 +/- 4.5% (Y-v-based calibration in response to hyperoxia), with hypercapnia-based M values between (p = 0.56). Relative CMRO2 changes from finger tapping were computed from each M map. CMRO2 increased by similar to 20% in the motor cortex, and good agreement was observed between the conventional and proposed calibration methods.