Nikola Radeljic-Jakic


  1. Effect of SAR-ADC Non-Idealities on Medical Ultrasound B-Mode Imaging
    N. Radeljic-Jakic; A. Flikweert; Y. Hopf; N. Rozsa; M. Pertijs;
    In Proc. IEEE International Ultrasonics Symposium (IUS),
    2023. abstract, accepted.

  2. Fast volumetric imaging using a matrix TEE probe with partitioned transmit-receive array
    D. Bera; F. van den Adel; N. Radeljic-Jakic; B. Lippe; M. Soozande; M. A. P. Pertijs; M. D. Verweij; P. Kruizinga; V. Daeichin; H. J. Vos; A. F. W. van der Steen; J. G. Bosch; N. de Jong;
    Ultrasound in Medicine \& Biology,
    Volume 44, Issue 9, pp. 2025-2042, July 2018. DOI: 10.1016/j.ultrasmedbio.2018.05.017
    Abstract: ... We describe a 3-D multiline parallel beamforming scheme for real-time volumetric ultrasound imaging using a prototype matrix transesophageal echocardiography probe with diagonally diced elements and separated transmit and receive arrays. The elements in the smaller rectangular transmit array are directly wired to the ultrasound system. The elements of the larger square receive aperture are grouped in 4 × 4-element sub-arrays by micro-beamforming in an application-specific integrated circuit. We propose a beamforming sequence with 85 transmit–receive events that exhibits good performance for a volume sector of 60° × 60°. The beamforming is validated using Field II simulations, phantom measurements and in vivo imaging. The proposed parallel beamforming achieves volume rates up to 59 Hz and produces good-quality images by angle-weighted combination of overlapping sub-volumes. Point spread function, contrast ratio and contrast-to-noise ratio in the phantom experiment closely match those of the simulation. In vivo 3-D imaging at 22-Hz volume rate in a healthy adult pig clearly visualized the cardiac structures, including valve motion.

  3. Volumetric imaging using adult matrix TEE with separated transmit and receive array
    D. Bera; F. van den Adel; N. Radeljic-Jakic; B. Lippe; M. Soozande; M. Pertijs; M. Verweij; P. Kruizinga; V. Daeichin; H. Vos; J. Bosch; N. de Jong;
    In Proc. IEEE International Ultrasonics Symposium (IUS),
    IEEE, pp. 1-1, September 2017. (abstract). DOI: 10.1109/ULTSYM.2017.8092906
    Abstract: ... The design of 3D TEE transducers poses severe technical challenges: channel count, electronics integration with high and low voltages, heat dissipation, etc. We present an adult matrix TEE probe with separate transmit (Tx) and receive (Rx) arrays allowing optimization in both Tx and Rx [1]. Tx elements are directly wired out, Rx employs integrated micro-beamformers in low-voltage (1.8/5.0V) chip technology. The prototype is fully integrated into a gastroscopic tube.

  4. Integrated Readout Circuit for Cross-Correlation Based Ultrasonic Ranging
    Nikola Radeljic-Jakic;
    MSc thesis, Delft University of Technology, December 2015.

  5. An eddy-current displacement-to-digital converter based on a ratio-metric delta-sigma ADC
    A. Fekri; M. Nabavi; N. Radeljic-Jakic; Z. Y. Chang; M. Pertijs; S. Nihtianov;
    In Proc. European Solid-State Circuits Conference (ESSCIRC),
    IEEE, pp. 403‒406, September 2014. DOI: 10.1109/esscirc.2014.6942107

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