Related Experiment Video
Updated: Sep 19, 2025
05:57
Blood Flow Imaging with Ultrafast Doppler
Published on: October 14, 2020
7.9K
Complementary Coded Multiplane Wave Sequences for SNR Increase in Ultrafast Power Doppler Ultrasound Imaging
Summary
This study introduces a new method for ultrafast power Doppler imaging using complete complementary codes (CCC) to significantly improve signal-to-noise ratio (SNR) and contrast for better blood flow visualization. The new technique, MPWI-CCC, enhances sensitivity, especially in deep tissues.
Area of Science:
- Ultrasound Imaging
- Medical Physics
- Biomedical Engineering
Background:
- Power Doppler imaging visualizes blood flow by measuring signal amplitude, crucial for detecting weak flows.
- Ultrafast power Doppler imaging advanced with coherent plane wave (PW) compounding.
- Limitations of current methods include low signal-to-noise ratio (SNR) and contrast due to lack of transmit focusing, hindering deep tissue visualization.
Purpose of the Study:
- To enhance the SNR and contrast of ultrafast power Doppler imaging.
- To improve sensitivity to blood flow detection, particularly in deep tissue regions.
- To introduce and evaluate a novel multi-PW imaging method utilizing complete complementary codes (CCC).
Main Methods:
- Proposed Multi-PW Imaging with CCC (MPWI-CCC) method.
- MPWI-CCC transmits N tilted PWs coded with a binary sequence, recovering backscattered signals via decoding.
- Comparison with Multi-PW Imaging with Hadamard encoding (MPWI-HD) and coherent PW compounding (CPWC) via simulations and experiments.
Main Results:
- MPWI-CCC demonstrated significant SNR and contrast gains compared to CPWC.
- With four PWs, MPWI-CCC achieved 13.02 dB SNR gain and 10.08 dB contrast gain over CPWC.
- MPWI-HD showed lower gains (6.99 dB SNR, 4.29 dB contrast) compared to MPWI-CCC.
Conclusions:
- MPWI-CCC effectively increases SNR and contrast in ultrafast power Doppler imaging.
- The CCC method offers superior performance over Hadamard encoding and CPWC for blood flow visualization.
- This technique holds promise for improved sensitivity in ultrasound-based blood flow detection.
Related Concept Videos
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
935
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.
935
01:17Ultrasonography
6.3K
Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
During an ultrasonography procedure, a handheld device called...
6.3K
01:22Upsampling
323
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
323
01:24Imaging Studies II: Ultrasonography
61
IntroductionUltrasonography, or renal ultrasound, is a noninvasive medical imaging technique that uses high-frequency sound waves to visualize the kidneys, ureters, bladder, and surrounding tissues.Indications for Urinary System UltrasonographyUrinary system ultrasonography is indicated in various clinical scenarios, such as:Kidney Stones (Urolithiasis): To detect and monitor the size and presence of kidney or urinary tract stones.Hydronephrosis: To assess the dilation of the renal pelvis and...
61
01:05Doppler Effect - II
3.6K
The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
3.6K
01:25Ultrasound II: Endoscopic Ultrasound and FibroScan
209
Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
Endoscopic Ultrasound (EUS):
Endoscopic Ultrasound (EUS):
209