M.Sc. Ankit Malhotra

• [ 2022 ]
• [ 2021 ]
• [ 2020 ]
• [ 2019 ]
• [ 2016 ]
• [ 2014 ]
• [ 2013 ]

• Neumann, A., Gräfe, K., von Gladiss, A., Ahlborg, M., Behrends, A., Chen, X., Schumacher, J., Soares, Y. B., Friedrich, T., Wei, H., Malhorta, A., Aderhold, E., Bakenecker, A. C., Lüdtke-Buzug, K. and Buzug, T. M.: Recent developments in magnetic particle imaging, Journal of Magnetism and Magnetic Materials, 550, 169037, 2022, DOI: 10.1016/j.jmmm.2022.169037.
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  @article{Neumann_2022, author = {Neumann, Alexander and Gräfe, Ksenija and von Gladiss, Anselm and Ahlborg, Mandy and Behrends, Andr{\'{e}} and Chen, Xin and Schumacher, Jonas and Soares, Yvonne Blancke and Friedrich, Thomas and Wei, Humin and Malhorta, Ankit and Aderhold, Eric and Bakenecker, Anna C. and Lüdtke-Buzug, Kerstin and Buzug, Thorsten M.}, journal = {Journal of Magnetism and Magnetic Materials}, keywords = {buzugthorsten}, month = {05}, pages = 169037, publisher = {Elsevier {BV}}, title = {Recent developments in magnetic particle imaging}, volume = 550, year = 2022 }
• Schumacher, J., Neumann, A., Malhotra, A., Behrends, A. and Buzug, T.: Verfahren zur Erfassung der magnetischen Antwort einer Verteilung magnetisierbarer Partikel auf ein magnetisches Anregungsfeld, 2022, DE 10 2020 118 102 B4.
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  @patent{schumacher2022verfahren, annote = {DE 10 2020 118 102 B4}, author = {Schumacher, Jonas and Neumann, Alexander and Malhotra, Ankit and Behrends, André and Buzug, Thorsten}, keywords = {buzugthorsten}, title = {Verfahren zur Erfassung der magnetischen Antwort einer Verteilung magnetisierbarer Partikel auf ein magnetisches Anregungsfeld}, year = 2022 }

• Behrends, A., Bakenecker, A., Ahlborg, M., Gräfe, K., Schumacher, J., Stelzner, J., Wegner, F., Neumann, A., Blancke Soares, Y., Lüdtke-Buzug, K., Chen, X., Wei, H., Malhotra, A., Friedrich, T. and Buzug, T. M.: Magnetic particle imaging, In: Imaging Modalities for Biological and Preclinical Research: A Compendium, IOP Publishing, , II.8–1 to II.8, 2021, DOI: 10.1088/978-0-7503-3747-2ch12.
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  @incollection{10.1088/978-0-7503-3747-2ch12, abstract = {This chapter aims to give an overview on the topic of magnetic particle imaging and its possibilities in diagnostics and therapy. An elementary discussion on particle properties and physical principles is proceeded by the concepts of signal generation, particle detection and spatial encoding used in magnetic particle imaging. A general description of the hardware setups and the reconstruction methods will give an impression of common challenges and their solutions. Furthermore, the medical relevance, especially the possibility to combine diagnostics and therapy is discussed. The chapter will be completed by a debate on strengths and limitations as well as future directions of the magnetic particle imaging modality.}, author = {Behrends, André and Bakenecker, Anna and Ahlborg, Mandy and Gräfe, Ksenija and Schumacher, Jonas and Stelzner, Jan and Wegner, Franz and Neumann, Alexander and Blancke Soares, Yvonne and Lüdtke-Buzug, Kerstin and Chen, Xin and Wei, Huimin and Malhotra, Ankit and Friedrich, Thomas and Buzug, Thorsten M.}, booktitle = {Imaging Modalities for Biological and Preclinical Research: A Compendium}, keywords = {buzugthorsten}, month = {05}, pages = {II.8-1 to II.8-10}, publisher = {IOP Publishing}, series = {2053-2563}, title = {Magnetic particle imaging}, type = {Book Chapter}, volume = 2, year = 2021 }
• Schumacher, J., Aderhold, E., Malhotra, A. and Buzug, T. M.: Highly Symmetric Receive Chain for Magnetic Particle Imaging, 2021.
  • [ BibTeX ]
  @inproceedings{schumacher2021highly, author = {Schumacher, Jonas and Aderhold, Eric and Malhotra, Ankit and Buzug, Thorsten M.}, booktitle = {55th Annual Conference of the German Society for Biomedical Engineering}, keywords = {buzugthorsten}, title = {Highly Symmetric Receive Chain for Magnetic Particle Imaging}, year = 2021 }

• Schumacher, J., Malhotra, A., Gräfe, K. and Buzug, T. M.: Highly symmetric filter for a fully differential receive chain, International Journal on Magnetic Particle Imaging, Vol 6 No 2 Suppl. 1 (2020), 2020, DOI: 10.18416/IJMPI.2020.2009031.
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  @article{https://doi.org/10.18416/ijmpi.2020.2009031, author = {Schumacher, Jonas and Malhotra, Ankit and Gräfe, Ksenija and Buzug, Thorsten M.}, journal = {International Journal on Magnetic Particle Imaging}, keywords = {SchumacherJonas}, pages = {Vol 6 No 2 Suppl. 1 (2020)}, publisher = {International Journal on Magnetic Particle Imaging}, title = {Highly symmetric filter for a fully differential receive chain}, year = 2020 }
• Malhotra, A., Schwegmann, H., Schumacher, J., Chen, X. and Buzug, T. M.: Fully differential low noise amplifier for MPI/MPS, International Journal on Magnetic Particle Imaging, Vol 6 No 2 Suppl. 1 (2020), 2020, DOI: 10.18416/IJMPI.2020.2009006.
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  @article{https://doi.org/10.18416/ijmpi.2020.2009006, author = {Malhotra, Ankit and Schwegmann, Holger and Schumacher, Jonas and Chen, Xin and Buzug, Thorsten M.}, journal = {International Journal on Magnetic Particle Imaging}, keywords = {SchwegmannHolger}, pages = {Vol 6 No 2 Suppl. 1 (2020)}, publisher = {International Journal on Magnetic Particle Imaging}, title = {Fully differential low noise amplifier for MPI/MPS}, year = 2020 }

• Malhotra, A., von Gladiss, A., Behrends, A., Friedrich, T., Neumann, A., Buzug, T. M. and Lüdtke-Buzug, K.: Tracking the Growth of Superparamagnetic Nanoparticles with an In-Situ Magnetic Particle Spectrometer (INSPECT), Scientific Reports, 9(10538), 2019, DOI: https://doi.org/10.1038/s41598-019-46882-6.
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  @article{malhotra2019tracking, abstract = {Magnetic Particle Spectroscopy (MPS) is a measurement technique to determine the magnetic properties of superparamagnetic iron oxide nanoparticles (SPIONs) in an oscillating magnetic field as applied in Magnetic Particle Imaging (MPI). State of the art MPS devices are solely capable of measuring the magnetization response of the SPIONs to an oscillatory magnetic excitation retrospectively, i.e. after the synthesis process. In this contribution, a novel in-situ magnetic particle spectrometer (INSPECT) is presented, which can be used to monitor the entire synthesis process from particle genesis via growth to the stable colloidal suspension of the nanoparticles in real time. The device is suitable for the use in a biochemistry environment. It has a chamber size of 72 mm such that a 100 ml reaction flask can be used for synthesis. For an alkaline-based precipitation, the change of magnetic properties of SPIONs during the nucleation and growth phase of the synthesis is demonstrated. The device is able to record the changes in the amplitude and phase spectra, and, in turn, the hysteresis. Hence, it is a powerful tool for an in-depth understanding of the nanoparticle formation dynamics during the synthesis process.}, author = {Malhotra, Ankit and von Gladiss, Anselm and Behrends, André and Friedrich, Thomas and Neumann, Alexander and Buzug, Thorsten M. and Lüdtke-Buzug, Kerstin}, journal = {Scientific Reports}, keywords = {luedtkekerstin}, month = {07}, number = 10538, title = {Tracking the Growth of Superparamagnetic Nanoparticles with an In-Situ Magnetic Particle Spectrometer (INSPECT)}, volume = 9, year = 2019 }
• Beuke, J., Brandt, K., Malhotra, A., Behrends, A., Friedrich, T., Gräfe, K., Rostalski, P. and Buzug, T. M.: Combined Active and Passive Cancellation of Receive Chain Direct Feedthrough, 49, 2019.
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  @inproceedings{beuke2019combined, author = {Beuke, Jonas and Brandt, Katrin and Malhotra, Ankit and Behrends, André and Friedrich, Thomas and Gräfe, Ksenija and Rostalski, Philipp and Buzug, Thorsten M.}, booktitle = {9th International Workshop on Magnetic Particle Imaging}, keywords = {IMT}, pages = 49, title = {Combined Active and Passive Cancellation of Receive Chain Direct Feedthrough}, year = 2019 }
• von Gladiss, A., Beuke, J., Weber, M., Malhotra, A., Behrends, A., Cordes, A., Stille, M., Behr, V. C., Vogel, P., Gräfe, K., Friedrich, T., Lüdtke-Buzug, K., Neumann, A., Ahlborg, M. and Buzug, T. M.: Dynamic 2D Imaging with an MPI Scanner Featuring a Mechanically Rotated FFL, 5, 2019.
  • [ BibTeX ]
  @inproceedings{vonGladiss2019dynamic, author = {von Gladiss, Anselm and Beuke, Jonas and Weber, Matthias and Malhotra, Ankit and Behrends, André and Cordes, Aileen and Stille, Maik and Behr, Volker C. and Vogel, Patrick and Gräfe, Ksenija and Friedrich, Thomas and Lüdtke-Buzug, Kerstin and Neumann, Alexander and Ahlborg, Mandy and Buzug, Thorsten M.}, booktitle = {9th International Workshop on Magnetic Particle Imaging}, keywords = {StilleMaik}, pages = 5, title = {Dynamic 2D Imaging with an MPI Scanner Featuring a Mechanically Rotated FFL}, year = 2019 }

• Malhotra, A., Spieß, F., Stegelmeier, C., Debbeler, C. and Lüdtke-Buzug, K.: Effect of key parameters on synthesis of superparamagnetic nanoparticles (SPIONs), Current Directions in Biomedical Engineering, 2(1), 529–532, 2016, DOI: 10.1515/cdbme-2016-0117.
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  @article{noauthororeditor, abstract = {There are various methods to synthesize superparamagnetic nanoparticles (SPIONs) useful for MPI (magnetic particle imaging) and in therapy (Hypothermia) such as co-precipitation, hydrothermal reactions etc. In this research, the focus is to analyse the effects of crucial parameters such as effect of molecular mass of dextran and temperature of the co-precipitation. These parameters play a crucial role in the inherent magnetic properties of the resulting SPIONs. The amplitude spectrum and hysteresis curve of the SPIONs is analysed with MPS (magnetic particle spectrometer). PCCS (photon cross-correlation spectroscopy) measurements are done to analyse the size distribution of hydrodynamic diameter the resulting SPIONs.}, author = {Malhotra, Ankit and Spieß, Felix and Stegelmeier, Corinna and Debbeler, Christina and Lüdtke-Buzug, Kerstin}, editor = {Dössel, Olaf}, journal = {Current Directions in Biomedical Engineering}, keywords = {StegelmeierCorinna}, month = {09}, number = 1, pages = {529-532}, title = {Effect of key parameters on synthesis of superparamagnetic nanoparticles (SPIONs)}, volume = 2, year = 2016 }

• Kusche, R., Malhotra, A., Ryschka, M. and Kaufmann, S.: A Portable In-Ear Pulse Wave Measurement System, 2014.
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  @inproceedings{Kusche2014a, author = {Kusche, Roman and Malhotra, Ankit and Ryschka, Martin and Kaufmann, Steffen}, booktitle = {Deutsche Gesellschaft für Biomedizinische Technik Jahrestagung}, keywords = {MalhotraAnkit}, title = {A Portable In-Ear Pulse Wave Measurement System}, year = 2014 }
• Malhotra, A., Kaufmann, S., Ardelt, G. and Ryschka, M.: A System for Multi-Modal Assessment of Cardiovascular Parameters - Design and Measurements, 111–114, 2014.
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  @inproceedings{Malhotra2014a, abstract = {This research introduces a novel multi-modal vital parameter measurement system and with some measurements taken. The system is able to accurately and simultaneously measure a single channel Electrocardiogram (ECG), four Photoplethysmograms(PPG), the pressure in both ears, as well as the broadband, time resolved thorax bioimpedance (ICG). The designed measurement system is based on a System on Chip (SoC) Field- Programmable Gate Array (FPGA) and a Texas Instruments analog front end (ADS1298) and in principle is in compliance with the IEC60601-1 safety requirements. ECG, PPG, ICG and in-ear measurements have a temporal resolution of about 1 ms. The measured time resolved impedance curve in connection with ECG and PPG and are digitally processed and analyzed in MathWorks MATLAB. Estimates of Stroke Volume (SV), Cardiac Output (CO), Pulse Arrival Time (PAT), Pulse Wave Velocity (PWV), Heart Rate Variability (HRV) and Respiration Rate (RR) are calculated from the different measurements.}, author = {Malhotra, A. and Kaufmann, S. and Ardelt, G. and Ryschka, M.}, booktitle = {Student Conference Medical Engineering Science}, keywords = {MalhotraAnkit}, pages = {111-114}, title = {A System for Multi-Modal Assessment of Cardiovascular Parameters - Design and Measurements}, year = 2014 }
• Kaufmann, S., Malhotra, A., Ardelt, G., Hunsche, N., Breßlein, K., Kusche, R. and Ryschka, M.: A System for In-Ear Pulse Wave Measurements, 271–274, 2014.
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  @inproceedings{Kaufmann2014b, abstract = {The measurement of the pulse wave has proven to be a vital tool in medical diagnosis. Whereby most pulse wave measurements are carried out at extremities, this work proposes a system for measuring the pulse wave and the Pulse Arrival Time (PAT) in the interior of the ear. The developed measurement device is based on a battery powered microcontroller system. The measurement device can simultaneously acquire a single channel Electrocardiogram (ECG), a dual wavelengths Photoplethysmogram (PPG), the pressure in both ears, the body core temperature, as well the subjects motion. The acquired measurement data can either be saved on a micro SD-card or can be transmitted wireless via Bluetooth or wired via USB to a host PC for further analysis. In Bluetooth communication mode the device can operate battery powered up to 8 hours. In addition to the system description, first measurements carried out with the system will be presented.}, author = {Kaufmann, S. and Malhotra, A. and Ardelt, G. and Hunsche, N. and Breßlein, K. and Kusche, R. and Ryschka, M.}, booktitle = {Student Conference Medical Engineering Science}, keywords = {MalhotraAnkit}, pages = {271-274}, title = {A System for In-Ear Pulse Wave Measurements}, year = 2014 }
• Kaufmann, S., Malhotra, A., Ardelt, G. and Ryschka, M.: A high accuracy broadband measurement system for time resolved complex bioimpedance measurements, Physiological Measurement, 35(6), 1163–1180, 2014, DOI: 10.1088/0967-3334/35/6/1163.
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  @article{Kaufmann2014a, abstract = {Bioimpedance measurements are useful tools in biomedical engineering and life science. Bioimpedance is the electrical impedance of living tissue and can be used in the analysis of various physiological parameters. Bioimpedance is commonly measured by injecting a small well known alternating current via surface electrodes into an object under test and measuring the resultant surface voltages. It is non-invasive, painless and has no known hazards. This work presents a field programmable gate array based high accuracy broadband bioimpedance measurement system for time resolved bioimpedance measurements. The system is able to measure magnitude and phase of complex impedances under test in a frequency range of about 10–500 kHz with excitation currents from 10 µA to 5 mA. The overall measurement uncertainties stay below 1% for the impedance magnitude and below 0.5° for the phase in most measurement ranges. Furthermore, the described system has a sample rate of up to 3840 impedance spectra per second. The performance of the bioimpedance measurement system is demonstrated with a resistor based system calibration and with measurements on biological samples.}, author = {Kaufmann, S. and Malhotra, A. and Ardelt, G. and Ryschka, M.}, journal = {Physiological Measurement}, keywords = {MalhotraAnkit}, number = 6, pages = {1163-1180}, title = {A high accuracy broadband measurement system for time resolved complex bioimpedance measurements}, volume = 35, year = 2014 }

• Kaufmann, S., Ardelt, G., Malhotra, A. and Ryschka, M.: In-Ear Pulse Wave Measurements: A Pilot Study, 2013, DOI: 10.1515/bmt-2013-4128.
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  @inproceedings{Kaufmann2013e, author = {Kaufmann, Steffen and Ardelt, Gunther and Malhotra, Ankit and Ryschka, Martin}, booktitle = {Deutsche Gesellschaft für Biomedizinische Technik Jahrestagung}, editor = {Dössel, Olaf}, keywords = {MalhotraAnkit}, number = {Supplement 1}, title = {In-Ear Pulse Wave Measurements: A Pilot Study}, volume = 58, year = 2013 }
• Kaufmann, S., Malhotra, A. and Ryschka, M.: A FPGA based Measurement System for the Estimation of the Stroke Volume of the Heart by measuring Bioimpedance Changes - First Results, 2013.
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  @inproceedings{Kaufmann2013b, author = {Kaufmann, Steffen and Malhotra, Ankit and Ryschka, Martin}, booktitle = {Proceedings of the International Conference on Electrical Bio-Impedance and the Conference on Electrical Impedance Tomography}, editor = {Pliquett, Uwe}, keywords = {MalhotraAnkit}, title = {A FPGA based Measurement System for the Estimation of the Stroke Volume of the Heart by measuring Bioimpedance Changes - First Results}, year = 2013 }