Magnetic flux density measurement through phase decomposition using non-interleaved scan in MREIT

• Published in: Electronics letters Vol. 51; no. 12; pp. 890 - 892
• Main Authors: Lee, Mun Bae, Jeong, Woo Chul, Sajib, Saurav Z.K, Kim, Hyung Joong, Kwon, Oh In
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 11.06.2015
• Subjects: 3D imaging object conductivity distribution; bioelectric phenomena; biomagnetism; biomedical electrodes; biomedical MRI; Biomedical technology; current density; electric impedance imaging; externally injected current; gradient multiecho train pulse sequence; in vivo electrical current density; interleaved encoding scheme; magnetic flux; magnetic flux density measurement; magnetic resonance electrical impedance tomography; MREIT techniques; multiple k‐space lines; negative current injection; noninterleaved scan; phantom experiments; phantoms; phase decomposition; positive current injection; scan duration reduction; single radio frequency pulse period; systematic phase artefact cancellation; magnetic flux; biomedical MRI; positive current injection; electric impedance imaging; single radio frequency pulse period; multiple k-space lines; phantoms; in vivo electrical current density; gradient multiecho train pulse sequence; negative current injection; 3D imaging object conductivity distribution; noninterleaved scan; magnetic resonance electrical impedance tomography; externally injected current; phase decomposition; current density; biomagnetism; scan duration reduction; systematic phase artefact cancellation; interleaved encoding scheme; magnetic flux density measurement; bioelectric phenomena; MREIT techniques; biomedical electrodes; phantom experiments
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2015.0447

Magnetic resonance electrical impedance tomography (MREIT) measures the z-component of magnetic flux density B = (Bx, By, Bz) induced by externally injected current through a pair of electrodes. MREIT visualises in-vivo electrical current density and/or conductivity distribution in a three-dimensional imaging object from the measured magnetic flux density Bz. MREIT techniques typically use the phase difference approach in an interleaved encoding scheme by the injection of positive and negative currents to cancel systematic phase artefacts. Developed is a method to measure Bz data using only a single scan by the injection of one current, avoiding the interleaved encoding scheme. The method separates measured multiple k-space lines into acquired k-space lines with and without injection currents and develops an algorithm to measure the magnetic flux density Bz using acquired k-space lines by the injecting current. Results from phantom experiments demonstrate that the method has potential to measure magnetic flux density using only a single scan by the injection of one current.