Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) PCASL Prescan RF and Z gradient pulse trains for tag (top) and control (bottom) conditions. In addition to the phase increment φ applied to each RF pulse in the pulse trains, PCASL Prescans are acquired with an extra phase θi, which is a fraction of 2π, added to the tag and control pulse trains where i is the index number of tag-control pairs and N is the number of phase steps. (b) Additional Gx/Gy pulse trains for off-resonance compensation during subsequent PCASL scans.
