Hybrid pcasl encoding

It is the hybrid of the time encoded and sequential encoding. N different PLDs were used after the encoding block, which gives improved flexibility link. The main idea is to design a few and small Hadamard encoding acquisitions with difference PLD. Similar to the time encoding sequence, the hybrid was designed to have T1 adjusted and fixed schemes.

As mentioned in the Fig.1 of Woods et al's paper link, Hadamard 4 was used in each encoding and 3 Hadamard encoding were acquired to get the final images.

hybrid fix

Hybrid T1 adjust

Hybrid variable

In addition, the LD was also varied to provide more flexibility.