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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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Related Experiment Video

Updated: Jun 28, 2026

Real-time Monitoring of High Intensity Focused Ultrasound (HIFU) Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound (HMIFU)
07:38

Real-time Monitoring of High Intensity Focused Ultrasound (HIFU) Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound (HMIFU)

Published on: November 3, 2015

High frequency coded imaging system with RF.

Marcin Lewandowski, Andrzej Nowicki

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |November 7, 2008
    PubMed
    Summary
    This summary is machine-generated.

    Coded excitation in high-frequency ultrasound imaging improves penetration and resolution. A new real-time system achieved significant signal-to-noise ratio gains, enhancing imaging capabilities.

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    Evaluation of the Feasibility, Safety, and Accuracy of an Intraoperative High-intensity Focused Ultrasound Device for Treating Liver Metastases
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    Evaluation of the Feasibility, Safety, and Accuracy of an Intraoperative High-intensity Focused Ultrasound Device for Treating Liver Metastases

    Published on: January 9, 2019

    Related Experiment Videos

    Last Updated: Jun 28, 2026

    Real-time Monitoring of High Intensity Focused Ultrasound (HIFU) Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound (HMIFU)
    07:38

    Real-time Monitoring of High Intensity Focused Ultrasound (HIFU) Ablation of In Vitro Canine Livers Using Harmonic Motion Imaging for Focused Ultrasound (HMIFU)

    Published on: November 3, 2015

    Evaluation of the Feasibility, Safety, and Accuracy of an Intraoperative High-intensity Focused Ultrasound Device for Treating Liver Metastases
    05:56

    Evaluation of the Feasibility, Safety, and Accuracy of an Intraoperative High-intensity Focused Ultrasound Device for Treating Liver Metastases

    Published on: January 9, 2019

    Area of Science:

    • Ultrasound Imaging
    • Biomedical Engineering
    • Signal Processing

    Background:

    • High-frequency (HF) ultrasound imaging faces a trade-off between penetration depth and image resolution.
    • Coded excitation techniques offer a potential solution to overcome this inherent compromise.
    • This study investigates the application of coded excitation in HF ultrasound (20-35 MHz).

    Discussion:

    • A novel real-time imaging system was developed for evaluating coded transmission in HF ultrasound.
    • The system utilizes a field-programmable gate array (FPGA) for arbitrary waveform coded transmission and high-speed RF echo sampling.
    • Real-time data streaming via USB and a balanced software architecture enable processing up to 30 frames/sec.

    Key Insights:

    • Signal-to-noise ratio (SNR) gain close to 14 dB was achieved using Golay code excitation at 20 MHz.
    • A 35-MHz Golay code demonstrated extended penetration and improved contrast in skin imaging.
    • The developed system provides a practical, low-cost implementation of coded excitation for HF ultrasound.

    Outlook:

    • The system serves as a valuable research tool for advancing HF ultrasound imaging.
    • This technology has the potential for integration into future production ultrasound systems.
    • Further research can explore diverse coded sequences and their impact on various ultrasound applications.