A simultaneous acquisition of VASO, ASL and BOLD signals was employed to measure relative functional changes induced by a block-designed, black-and-white checkerboard visual task containing three stimulus frequencies and two oxygen-level conditions. We report that 1) δCBV, δCBF and δBOLD increase along with visual stimulus frequencies for both oxygen-level conditions; 2) δBOLD, but not δCBV or δCBF, acquired under hypoxia condition is significantly lower than that acquired under normoxia condition for all the three stimulus frequencies. According to Fick’s principle, our results predict increases of oxygen consumption rate among various stimulus frequencies during hypoxia.
How to access this content:
For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.
After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.
After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.
Keywords