TY - JOUR
T1 - Gradient waveform synthesis for magnetic propulsion using MRI gradient coils
AU - Han, B. H.
AU - Park, S.
AU - Lee, S. Y.
PY - 2008/9/7
Y1 - 2008/9/7
N2 - Navigating an untethered micro device in a living subject is of great interest for both diagnostic and therapeutic applications. Magnetic propulsion of an untethered device carrying a magnetic core in it is one of the promising methods to navigate the device. MRI gradients coils are thought to be suitable for navigating the device since they are capable of magnetic propulsion in any direction while providing magnetic resonance images. For precise navigation of the device, especially in the peripheral region of the gradient coils, the concomitant gradient fields, as well as the linear gradient fields in the main magnetic field direction, should be considered in driving the gradient coils. For simple gradient coil configurations, the Maxwell coil in the z-direction and the Golay coil in the x- and y-directions, we have calculated the magnetic force fields, which are not necessarily the same as the conventional linear gradient fields of MRI. Using the calculated magnetic force fields, we have synthesized gradient waveforms to navigate the device along a desired path.
AB - Navigating an untethered micro device in a living subject is of great interest for both diagnostic and therapeutic applications. Magnetic propulsion of an untethered device carrying a magnetic core in it is one of the promising methods to navigate the device. MRI gradients coils are thought to be suitable for navigating the device since they are capable of magnetic propulsion in any direction while providing magnetic resonance images. For precise navigation of the device, especially in the peripheral region of the gradient coils, the concomitant gradient fields, as well as the linear gradient fields in the main magnetic field direction, should be considered in driving the gradient coils. For simple gradient coil configurations, the Maxwell coil in the z-direction and the Golay coil in the x- and y-directions, we have calculated the magnetic force fields, which are not necessarily the same as the conventional linear gradient fields of MRI. Using the calculated magnetic force fields, we have synthesized gradient waveforms to navigate the device along a desired path.
UR - http://www.scopus.com/inward/record.url?scp=51849096462&partnerID=8YFLogxK
U2 - 10.1088/0031-9155/53/17/012
DO - 10.1088/0031-9155/53/17/012
M3 - Article
C2 - 18695296
AN - SCOPUS:51849096462
SN - 0031-9155
VL - 53
SP - 4639
EP - 4649
JO - Physics in Medicine and Biology
JF - Physics in Medicine and Biology
IS - 17
ER -