N.V. Anisimov1, A.A. Tarasova2, O.S. Pavlova3, D.V. Fomina4, I.A. Usanov5, A.M. Makurenkov6, G.E. Pavlovskaya7, Yu.A. Pirogov8
1,2,3,4,5,6,7 Lomonosov Moscow State University (Moscow, Russia)
4,7 Sir Peter Mansfield Imaging Centre, School of Medicine, University of Nottingham (UK)
7 Nottingham NIHR Biomedical Research Centre
Object. The purpose of this work is to reveal the possibilities of low-field 23Na MRI. It was supposed to obtain images of various human organs using the 3D-scanning method, and to do this with minimal hardware modifications of a typical clinical 0,5T scanner.
Materials and methods. The proprietary receiving coils, originally intended for registering proton signals (21,1 MHz), were transformed to transceiver ones and tuned to the sodium Larmor frequency of 5,6 MHz. The scanning was carried out by the 3D-gradient echo method with the parameters: TR/TE=44,7/12 ms, FA=45° and isotropic resolution of 6 mm. To increase SNR, apodization in k-space was applied during data processing.
Results. 23Na MRI (including volumetric reconstructions) of several human organs – head, breast, heart, joints were obtained with SNR up to 15.
Discussion. When developing low-field 23Na MRI, it is advisable to focus on recording only the T2long component (>15 ms). In this case, it is possible to narrow the receiver bandwidth as much as possible and thereby minimize noise. In addition, the requirements for the transmission path are reduced. As a result, for debugging MRI methods, the equipment of a typical clinical scanner, which is supplemented by coils tuned to the sodium NMR frequency only, can be used.
Anisimov N.V., Tarasova A.A., Pavlova O.S., Fomina D.V., Usanov I.A., Makurenkov A.M., Pavlovskaya G.E., Pirogov Yu.A. 23Na MRI on 0,5T clinical scanner. Achievements of modern radioelectronics. 2021. V. 75. № 5. P. 37–45. DOI: https://doi.org/10.18127/j20700784-202104-02
- Madelin G., Lee J.-S., Regatte R.R., Jerschow A. (2014) Sodium MRI: methods and applications Prog Nucl Magn Reson Spectrosc 79: 14–47.
- Burstein D., Springer Jr. CS. (2019) Sodium MRI revisited Magn Reson Med 82(2): 521–524.
- Mellon E.A., Pilkinton D.T., Clark C.M., Elliott M.A., Witschey 2nd W.R., Borthakur A., Reddy R. (2009) Sodium MR Imaging Detection of Mild Alzheimer Disease: Preliminary Study Am J Neuroradiol 30(5): 978–984.
- Reetz K., Romanzetti S., Dogan I., Saβ C., Werner K.J., Schiefer J., Schulz J.B., Shah N.J. (2012) Increased brain tissue sodium concentration in Huntington's Disease — A sodium imaging study at 4 T NeuroImage 63(1): 517–524.
- Karg M.V., Bosch A., Kannenkeril D. & etc. (2018) SGLT-2-inhibition with dapagliflozin reduces tissue sodium content: a randomised controlled trial Cardiovasc Diabetol 17(1):5. URL: https://doi.org/10.1186/s12933-017-0654-z.
- Christa M., Weng A.M., Geier B. & etc. (2019) Increased myocardial sodium signal intensity in Conn’s syndrome detected by 23Na magnetic resonance imaging Eur Heart J Cardiovasc Imaging 20(3): 263–270.
- Haacke E.M., Brown R.W., Thompson M.R., Venkatesan R. (1999), Magnetic Resonance Imaging: Physical Principles and Sequence Design. Wiley, Hoboken.
- Ra J.B., Hilal S.K., Oh C.H., Mun (1988) In vivo magnetic resonance imaging of sodium in the human body Magn Reson Med 7(1): 11–22.
- Halbach K. (1980) Design of permanent multipole magnets with oriented rare earth cobalt material Nucl Instrum Methods 169: 1–10.
- Cooley C.Z., Haskell M.W., Cauley S.F., Sappo C., Lapierre C.D., Ha C.G., Stockmann J.P., Wald L.L. (2018) Design of Sparse Halbach Magnet Arrays for Portable MRI Using a Genetic Algorithm IEEE Trans Magn 54(1): 5100112.
- Anisimov N.V., Sadykhov E.G., Pavlova O.S., Fomina D.V., Pirogov Yu.A. (2019) Whole Body Sodium MRI at 0.5 Tesla Using Surface Coil and Long Echo Time Sequence Appl Magn Reson 50(10): 1149–1161.
- Wetterling F., Corteville D.M., Kalayciyan R., Rennings A., Konstandin S., Nagel A.M., Stark H., Schad L.R. (2012) Whole body sodium MRI at 3T using an asymmetric birdcage resonator and short echo time sequence: first images of a male volunteer Phys Med Biol 57(14): 4555–4567.
- Anisimov N.V., Volkov D., Gulyaev M., Pavlova O., Pirogov Yu. (2016) The registration of signals from the nuclei other than protons at 0.5 T MRI scanner J Phys Conf Ser 677: 012005.
- Anisimov N.V., Pavlova O.S., Agafonnikova A.G., Kosenkov A.V., Fomina D.V. (2019) Multinuclear Applications on 0.5 T Magnetic Resonance Scanner Appl Magn Reson 50(1–3): 17–27.
- Anisimov N.V., Tarasova A.A., Pavlova O.S., Fomina D.V., Makurenkov A.M., Pavlovskaya G.E., Pirogov Yu.A. (2021) MRI Coils Optimized for Detection of 1H and 23Na at 0.5 T Appl Magn Reson 52(3): 221–233.
- Gilbert K.M., Scholl T.J., Chronik B.A. (2008) RF coil loading measurements between 1 and 50 MHz to guide field–cycled MRI system design Concepts Magn Reson Part B Magn Reson Eng 33B(3): 177–191.
- Schneider C.A., Rasband W.S., Eliceiri K.W. (2012) NIH Image to ImageJ: 25 years of image analysis Nat Methods 9(7): 671–675. 18. McVeigh E.R., Henkelman R.M., Bronskill M.J. (1985) Noise and filtration in magnetic resonance imaging Med Phys 12: 586–591.
- Parker D.L., Gullberg G.T., Frederick P.R. (1987) Gibbs artifact removal in magnetic resonance imaging Med Phys 14: 640–645.
- Stobbe R., Beaulieu C. (2008) Advantage of sampling density weighted apodization over postacquisition filtering apodization for sodium MRI of the human brain Magn Reson Med 60: 981–986.