Welcome to my website! I'm a researcher active in the field of medical physics, specializing in the application of magnetic resonance imaging to support radiation therapy for cancer. As part of my research, I have developed methods to convert magnetic resonance images into synthetic computed tomography images, employing them for radiation therapy treatment planning and positron emission tomography attenuation correction. My work also includes motion-correction techniques for functional and anatomical magnetic resonance imaging, as well as reconstruction techniques to visualize and track anatomical motion in support of adaptive radiation therapy.
For further information, please refer to the publications below or visit my ORCID page.
https://
Lianli Liu, Liyue Shen, Adam Johansson, James M Balter, Yue Cao, Lucas Vitzthum, Lei Xing.
Volumetric MRI with sparse sampling for MR-guided 3D motion tracking via sparse prior-augmented implicit neural representation learning.
Med Phys 2023;E-pub ahead of print.
https://
Lianli Liu, Liyue Shen, Adam Johansson, James M Balter, Yue Cao, Daniel Chang, Lei Xing.
Real time volumetric MRI for 3D motion tracking via geometry-informed deep learning.
Med Phys 2022;49(9):6110-6119.
https://
Lianli Liu, Adam Johansson, Yue Cao, Theodore S Lawrence, James M Balter.
Volumetric prediction of breathing and slow drifting motion in the abdomen using radial MRI and multi-temporal resolution modeling.
Phys Med Biol 2021;66(17):175028.
https://
Adam Johansson, James M Balter, Yue Cao.
Gastrointestinal 4D MRI with respiratory motion correction.
Med Phys 2021;48(5):2521-2527.
https://
Lianli Liu, Adam Johansson, Yue Cao, Rojano Kashani, Theodore S Lawrence, James M Balter.
Modeling intra-fractional abdominal configuration changes using breathing motion-corrected radial MRI.
Phys Med Biol 2021;66(8):085002.
https://
Yuhang Zhang, Rojano Kashani, Yue Cao, Theodore S Lawrence, Adam Johansson, James M Balter.
A hierarchical model of abdominal configuration changes extracted from golden angle radial magnetic resonance imaging.
Phys Med Biol 2021;66(4):045018.
https://
Lianli Liu, Adam Johansson, Yue Cao, Janell Dow, Theodore S Lawrence, James M Balter.
Abdominal synthetic CT generation from MR Dixon images using a U-Net trained with 'semi-synthetic' CT data.
Phys Med Biol 2020;65(12):125001.
https://
Adam Johansson, James M Balter, Yue Cao.
Abdominal DCE-MRI reconstruction with deformable motion correction for liver perfusion quantification.
Med Phys 2018;45(10):4529-4540.
https://
Josiah Simeth, Adam Johansson, Dawn Owen, Kyle Cuneo, Michelle Mierzwa, Mary Feng, Theodore S Lawrence, Yue Cao.
Quantification of liver function by linearization of a two‐compartment model of gadoxetic acid uptake using dynamic contrast‐enhanced magnetic resonance imaging.
NMR Biomed 2018;31:e3913.
https://
Adam Johansson, James Balter, Yue Cao.
Rigid-body motion correction of the liver in image reconstruction for golden-angle stack-of-stars DCE MRI.
Magn Reson Med 2018;79:1345–1353.
https://
Issam El Naqa, Adam Johansson, Dawn Owen, Kyle Cuneo, Yue Cao, Martha Matuszak, Latifa Bazzi, Theodore S Lawrence, Randall K Ten Haken.
Modeling of Normal Tissue Complications Using Imaging and Biomarkers After Radiation Therapy for Hepatocellular Carcinoma.
Int J Radiat Oncol Biol Phys 2018;100:335–343.
https://
Josef A Lundman, Adam Johansson, Jörgen Olofsson, Jan Axelsson, Anne Larsson, Tufve Nyholm.
Effect of gradient field nonlinearity distortions in MRI-based attenuation maps for PET reconstruction.
Phys Medica 2017;35:1–6.
https://
Adam Johansson, James Balter, Mary Feng, Yue Cao.
An overdetermined system of transform equations in support of robust DCE-MRI registration with outlier rejection.
Tomography 2016;2(3):188–196.
https://
Joakim H Jonsson, Mohammad M Akhtari, Magnus G Karlsson, Adam Johansson, Thomas Asklund, Tufve Nyholm.
Accuracy of inverse treatment planning on substitute CT images derived from MR data for brain lesions.
Radiat Oncol 2015;10(13):1–17.
https://
Adam Johansson, Anders Garpebring, Thomas Asklund, Tufve Nyholm.
CT substitutes derived from MR images reconstructed with parallel imaging.
Med Phys 2014;41(8):82302-1–7.
https://
Anne Larsson, Adam Johansson, Jan Axelsson, Tufve Nyholm, Thomas Asklund, Katrine Riklund, Mikael Karlsson.
Evaluation of an attenuation correction method for PET/MR imaging of the head based on substitute CT images.
Magn Reson Mater Phys 2013;26:127–136.
https://
Adam Johansson, Anders Garpebring, Mikael Karlsson, Thomas Asklund, Tufve Nyholm.
Improved quality of computed tomography substitute derived from magnetic resonance (MR) data by incorporation of spatial information - potential application for MR-only radiotherapy and attenuation correction in positron emission tomography.
Acta Oncol 2013;52:1369–1373.
https://
Anton Lindström, C David Andersson, Adam Johansson, Mikael Karlsson, Tufve Nyholm.
Bone contrast optimization in magnetic resonance imaging using experimental design of ultra-short echo-time parameters.
Chemom Intell Lab Syst 2013;125:33–39.
https://
Anders Garpebring, Patrik Brynolfsson, Jun Yu, Ronnie Wirestam, Adam Johansson, Thomas Asklund, Mikael Karlsson.
Uncertainty estimation in dynamic contrast-enhanced MRI.
Magn Reson Med 2013;69(4):992–1002.
https://
Joakim H Jonsson, Adam Johansson, Karin Söderström, Thomas Asklund, Tufve Nyholm.
Treatment planning of intracranial targets on MRI derived substitute CT data.
Radiother Oncol 2013;108(1):118–122.
https://
Adam Johansson, Mikael Karlsson, Jun Yu, Thomas Asklund, Tufve Nyholm.
Voxel-wise uncertainty in CT substitute derived from MRI.
Med Phys 2012;39(6):3283–3290.
https://
Adam Johansson, Mikael Karlsson, Tufve Nyholm.
CT substitute derived from MRI sequences with ultrashort echo time.
Med Phys 2011;38(5):2708–2714.
https://
Lianli Liu, Liyue Shen, Adam Johansson, Yue Cao, James Balter, Lucas Vitzthum, Lei Xing. Real Time Volumetric MRI for MR-Guided 3D Motion Tracking via Sparse Prior-Augmented Neural Representation Learning. Int J Radiat Oncol Biol Phys 2023;117(S2):S47-S48. https://doi.org/10.1016/j.ijrobp.2023.06.327
Lianli Liu, Liyue Shen, Adam Johansson, James Balter, Yue Cao, Lei Xing. A Physics-Aware Deep Neural Network for Real Time Volumetric MRI in Support of MR-Guided Radiotherapy. Med Phys 2021;48(6):e323. https://doi.org/10.1002/mp.15041
Yuhang Zhang, James Balter, Rojano Kashani, Yue Cao, Janell Dow, Adam Johansson A Hierarchical Motion Model From Dynamic MRI to Characterize Abdominal Configuration Changes. Med Phys 2020;47(6):e328. https://doi.org/10.1002/mp.14316
Lianli Liu, Adam Johansson, Yue Cao, James Balter. Multi-Temporal Resolution Model-Based Volumetric Prediction of Breathing and Slow Drifting Motion in the Abdomen Using Radial MRI. Med Phys 2020;47(6):e327-e328. https://doi.org/10.1002/mp.14316
J Simeth, N Baughan, J Dow, R Ten Haken, A Johansson, M Aryal, D Owen, K Cunco, T Lawrence, Y Cao, M Matuszak. Impact of Mis-Match Between Liver Function and Hepatic Perfusion On Functional Avoidance Treatment Planning. Med Phys 2018;45:e582. https://doi.org/10.1002/mp.12938
Adam Johansson, James Balter, Yue Cao. Gastrointestinal 4D MRI with respiratory motion correction. Med Phys 2018;45:e583-e584. https://doi.org/10.1002/mp.12938
Lianli Liu, Adam Johansson, James M Balter, Jeffrey A Fessler, Yue Cao. Accelerated high b-value diffusion-weighted MRI for higher-order diffusion analysis using a phase-constrained low-rank tensor model. Proc Intl Soc Magn Reson Med 2018;26:655. http://archive.ismrm.org/2017/0655.html
Adam Johansson, James M Balter, Yue Cao. Effects of reconstruction with deformable motion correction on abdominal DCE-MRI images. Proc Intl Soc Magn Reson Med 2018;26:475. http://archive.ismrm.org/2018/0475.html
Lianli Liu, Adam Johansson, James M Balter, Yue Cao, Jeffrey A Fessler. Accelerated high b-value diffusion-weighted MR imaging via phase-constrained low-rank tensor model. IEEE International Symposium on Biomedical Imaging 2018;15:344-348. https://doi.org/10.1109/ISBI.2018.8363589
Dawn Owen, Karen A Vineberg, Pin Li, Yue Cao, Adam Johansson, Kyle C Cuneo, Theodore S Lawrence, James Balter. Utility of 4DMRI for Liver Radiation Planning. Int J Radiat Oncol 2017;99:S176–S177. https://doi.org/10.1016/J.IJROBP.2017.06.444
Adam Johansson, James Balter, Yue Cao. Motion-corrected image reconstruction of abdominal DCE-MRI images. Proc Intl Soc Magn Reson Med 2017;25:1295. http://archive.ismrm.org/2017/1295.html
Adam Johansson, James Balter, Mary Feng, Yue Cao. WE-FG-206-10: Portal Venous Perfusion Quantitation From Liver DCE-MRI by Voxel Uptake Curve Clustering and Input Function Normalization. Med Phys 2016;43:3833–3833. https://doi.org/10.1118/1.4957940
Joakim Jonsson, Mohammad Akhtari, Mikael Karlsson, Adam Johansson, Thomas Asklund, Tufve Nyholm. EP-1601: Accuracy of inverse treatment planning on substitute CT images derived from MR data in brain lesions. Radiother Oncol 2014;111:S203–S204. https://doi.org/10.1016/S0167-8140(15)31719-9
Adam Johansson, Anders Garpebring, Tufve Nyholm. CT substitutes derived from SPIRiT and CG-SENSE reconstructed images. Proc Intl Soc Magn Reson Med 2013;21:1665. http://archive.ismrm.org/2013/1665.html
Adam Johansson, Mikael Karlsson, Tufve Nyholm. PO-0861 UNCERTAINTY IN CT SUBSTITUTE DERIVED FROM MRI. Radiother Oncol 2012;103:S336–S337. https://doi.org/10.1016/S0167-8140(12)71194-5
Joakim Jonsson, Adam Johansson, Tufve Nyholm. PO-0852 TREATMENT PLANNING BASED ON AUTOMATICALLY DENSITY MAPPED MR IMAGES. Radiother Oncol 2012;103:S333. https://doi.org/10.1016/S0167-8140(12)71185-4
Anders Garpebring, Patrik Brynolfsson, Jun Yu, Ronnie Wirestam, Adam Johansson, Thomas Asklund, Mikael Karlsson. Uncertainty Maps in Dynamic Contrast-Enhanced MRI. Proc Intl Soc Magn Reson Med 2012;20:0242. http://archive.ismrm.org/2012/0242.html
Tufve Nyholm, Adam Johansson, Mikael Karlsson. 379 oral VOXEL BASED METHOD TO GENERATE CT EQUIVALENT IMAGES FROM MR IMAGES FOR TREATMENT PLANNING PURPOSES. Radiother Oncol 2011;99:S149–S150. https://doi.org/10.1016/S0167-8140(11)70501-1
Adam Johansson, Joakim Jonsson, Mikael Karlsson, Tufve Nyholm. MRI Derived CT Substitute. Proc Intl Soc Magn Reson Med 2011;19:1116. http://archive.ismrm.org/2011/1116.html
Adam Johansson. Magnetic resonance imaging with ultrashort echo time as a substitute for X-ray computed tomography. PhD dissertation, Umeå University; 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-93053
Adam Johansson. Evaluation of Bone Contrast Enhanced MRI Sequences and Voxel Based Segmentation. Master's thesis, Umeå University; 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-37560