Meeting Banner
Abstract #3361

Intensity Correction at 7T Using Bloch-Siegert B1+ Mapping

Mohammad Mehdi Khalighi1, Michael Zeineh2, Brian K. Rutt2

1Global Applied Science Lab, GE Healthcare, Menlo Park, CA, United States; 2Radiology Deaprtment, Stanford University, Stanford, CA, United States

High field MRI image signal is distorted by receive sensitivity variations. With the added complication of highly non-uniform transmit (B1+) at high field, receive sensitivity correction becomes even more challenging. Here we used Bloch-Siegert (B-S) B1+ mapping method to measure B1+ field and thus transmit sensitivity. Then the B-S magnitude images were used to estimate the receive sensitivity map for each individual channel over the whole brain, which was used to correct subsequent structural brain images. These receive sensitivity maps could be also used in parallel imaging reconstruction such as ASSET or SENSE.

Abstract PDF E-Poster Video

Keywords

achieve added affected applied array asset assume assumed assumption behind beneficial block body brain channel channels coil coils combined comp contains contrast corrected correction create cube density depend diagram dominating dual equation especially field filter filtered filtering final frequencies frequency give global good gradient graph head holds inhomogeneity insensitive intensity known likely long mapping maps matrix measured measuring needed nova often optimized original parallel park pass press processing produced proposed proton pulse quadrature quantitative radiology receive relatively remove resolution science selected sense sensitivities sensitivity separable separate side simple slab slice slices spacing spatial spoiled square step support target term theory tissue together transmit uniform version volunteer write