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The role of the acoustic radiation force in color Doppler twinkling artifacts.

Yang JH, Kang G, Choi MJ - Ultrasonography (2015)

Bottom Line: Color twinkling artifacts were observed to be most conspicuous at the lowest PRF of 0.1 kHz.The extent of twinkling rapidly decreased as the PRF increased, eventually disappearing when the PRF ≥0.6 kHz.The measured ultrasound transmissions, however, were found to be insensitive to the PRF, and therefore it can be inferred that the PRF was insensitive to the ARF.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiotechnology, Cheju Halla University, Jeju, Korea.

ABSTRACT

Purpose: The aim of this experimental study was to evaluate whether the acoustic radiation force (ARF) is a potential source of twinkling artifacts in color Doppler images.

Methods: Color Doppler images were obtained using a clinical ultrasonic scanner (Voluson e, GE Healthcare) for a high contrast (+15 dB) circular scattering phantom at pulse repetition frequencies (PRFs) ranging from 0.1 to 13 kHz. Ultrasound transmissions resulting in ARF were measured using a hydrophone at the various PRFs considered. The influence of ARF on the appearance of twinkling colors was examined via the common parameter PRF. This methodology is based on the fact that alternating positive and negative Doppler shifts induced by the ARF are centered at a PRF twice the maximum Doppler frequency on the color scale bar, whereas the twinkling color aliasing is expected to remain similar regardless of PRF.

Results: Color twinkling artifacts were observed to be most conspicuous at the lowest PRF of 0.1 kHz. The extent of twinkling rapidly decreased as the PRF increased, eventually disappearing when the PRF ≥0.6 kHz. The measured ultrasound transmissions, however, were found to be insensitive to the PRF, and therefore it can be inferred that the PRF was insensitive to the ARF.

Conclusion: Based on our experimental observations, the ARF may not be a source of color Doppler twinkling artifacts.

No MeSH data available.


Related in: MedlinePlus

A schematic experimental setup for recording transmitted ultrasonic pulses generated by a clinical ultrasonic scanner (Voluson e, GE Healthcare).Waveforms were measured in a water tank using a needle hydrophone (TNU001A, NTR Systems) and stored on a digital scope (CS122G1, GaGe, Dynamic Signals LLC).
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f1-usg-14065: A schematic experimental setup for recording transmitted ultrasonic pulses generated by a clinical ultrasonic scanner (Voluson e, GE Healthcare).Waveforms were measured in a water tank using a needle hydrophone (TNU001A, NTR Systems) and stored on a digital scope (CS122G1, GaGe, Dynamic Signals LLC).

Mentions: The ARF that can induce a target to vibrate at the PRF is produced by each transmitted ultrasonic pulse that irradiates a target when the ultrasonic scanner is operated in the color Doppler mode. The ARF is estimated from the transmitted ultrasonic pulse and the acoustic properties of the medium through which the ultrasound pulse propagates. For a given imaging target, the ARF is approximately derived from the transmitted ultrasonic pulse measured in a reference medium. The transmitted pulse was measured in a water tank using a needle hydrophone (TNU001A, NTR Systems) at nominal PRFs ranging from 0.1 kHz to higher values (Fig. 1). The measured transmitted pulses were stored on a digital scope (CS122G1, GaGe, Dynamic Signals LLC, Lockport, IL, USA). The pulse intensity integral of each transmitting ultrasonic pulse was calculated from the measured waveform, which is closely related to the ARF [11]. The recordings were repeated 12 times in order to examine the variability of the pressure and the intensity of transmitted ultrasonic pulses.


The role of the acoustic radiation force in color Doppler twinkling artifacts.

Yang JH, Kang G, Choi MJ - Ultrasonography (2015)

A schematic experimental setup for recording transmitted ultrasonic pulses generated by a clinical ultrasonic scanner (Voluson e, GE Healthcare).Waveforms were measured in a water tank using a needle hydrophone (TNU001A, NTR Systems) and stored on a digital scope (CS122G1, GaGe, Dynamic Signals LLC).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4372716&req=5

f1-usg-14065: A schematic experimental setup for recording transmitted ultrasonic pulses generated by a clinical ultrasonic scanner (Voluson e, GE Healthcare).Waveforms were measured in a water tank using a needle hydrophone (TNU001A, NTR Systems) and stored on a digital scope (CS122G1, GaGe, Dynamic Signals LLC).
Mentions: The ARF that can induce a target to vibrate at the PRF is produced by each transmitted ultrasonic pulse that irradiates a target when the ultrasonic scanner is operated in the color Doppler mode. The ARF is estimated from the transmitted ultrasonic pulse and the acoustic properties of the medium through which the ultrasound pulse propagates. For a given imaging target, the ARF is approximately derived from the transmitted ultrasonic pulse measured in a reference medium. The transmitted pulse was measured in a water tank using a needle hydrophone (TNU001A, NTR Systems) at nominal PRFs ranging from 0.1 kHz to higher values (Fig. 1). The measured transmitted pulses were stored on a digital scope (CS122G1, GaGe, Dynamic Signals LLC, Lockport, IL, USA). The pulse intensity integral of each transmitting ultrasonic pulse was calculated from the measured waveform, which is closely related to the ARF [11]. The recordings were repeated 12 times in order to examine the variability of the pressure and the intensity of transmitted ultrasonic pulses.

Bottom Line: Color twinkling artifacts were observed to be most conspicuous at the lowest PRF of 0.1 kHz.The extent of twinkling rapidly decreased as the PRF increased, eventually disappearing when the PRF ≥0.6 kHz.The measured ultrasound transmissions, however, were found to be insensitive to the PRF, and therefore it can be inferred that the PRF was insensitive to the ARF.

View Article: PubMed Central - PubMed

Affiliation: Department of Radiotechnology, Cheju Halla University, Jeju, Korea.

ABSTRACT

Purpose: The aim of this experimental study was to evaluate whether the acoustic radiation force (ARF) is a potential source of twinkling artifacts in color Doppler images.

Methods: Color Doppler images were obtained using a clinical ultrasonic scanner (Voluson e, GE Healthcare) for a high contrast (+15 dB) circular scattering phantom at pulse repetition frequencies (PRFs) ranging from 0.1 to 13 kHz. Ultrasound transmissions resulting in ARF were measured using a hydrophone at the various PRFs considered. The influence of ARF on the appearance of twinkling colors was examined via the common parameter PRF. This methodology is based on the fact that alternating positive and negative Doppler shifts induced by the ARF are centered at a PRF twice the maximum Doppler frequency on the color scale bar, whereas the twinkling color aliasing is expected to remain similar regardless of PRF.

Results: Color twinkling artifacts were observed to be most conspicuous at the lowest PRF of 0.1 kHz. The extent of twinkling rapidly decreased as the PRF increased, eventually disappearing when the PRF ≥0.6 kHz. The measured ultrasound transmissions, however, were found to be insensitive to the PRF, and therefore it can be inferred that the PRF was insensitive to the ARF.

Conclusion: Based on our experimental observations, the ARF may not be a source of color Doppler twinkling artifacts.

No MeSH data available.


Related in: MedlinePlus