Limits...
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

Acoustic output against the pulse repetition frequency (PRF).The peak magnitudes (A) and the pulse intensity integrals (B) of the transmitted ultrasonic pulses were measured at varying PRFs, and the results suggest that the acoustic radiation force of the ultrasound transmission remained almost the same regardless of the PRF. The mean and standard deviation were obtained from 12 repeated recordings.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4372716&req=5

f3-usg-14065: Acoustic output against the pulse repetition frequency (PRF).The peak magnitudes (A) and the pulse intensity integrals (B) of the transmitted ultrasonic pulses were measured at varying PRFs, and the results suggest that the acoustic radiation force of the ultrasound transmission remained almost the same regardless of the PRF. The mean and standard deviation were obtained from 12 repeated recordings.

Mentions: As expected, the mean values of the peak pressures and the pulse intensity integral remained virtually unchanged (within 3%) as the PRF varied from 0.1 to 13 kHz (Fig. 3). The standard deviations were found to be insignificant, indicating that the transmitted ultrasonic pulses produced for color Doppler imaging were highly stable. The PRF was not observed to have an effect on transmitted ultrasonic pulses, which suggests that the PRF also does not affect the magnitude of the ARF produced by the transmitted ultrasonic pulse that irradiates the target.


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

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

Acoustic output against the pulse repetition frequency (PRF).The peak magnitudes (A) and the pulse intensity integrals (B) of the transmitted ultrasonic pulses were measured at varying PRFs, and the results suggest that the acoustic radiation force of the ultrasound transmission remained almost the same regardless of the PRF. The mean and standard deviation were obtained from 12 repeated recordings.
© Copyright Policy
Related In: Results  -  Collection

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

f3-usg-14065: Acoustic output against the pulse repetition frequency (PRF).The peak magnitudes (A) and the pulse intensity integrals (B) of the transmitted ultrasonic pulses were measured at varying PRFs, and the results suggest that the acoustic radiation force of the ultrasound transmission remained almost the same regardless of the PRF. The mean and standard deviation were obtained from 12 repeated recordings.
Mentions: As expected, the mean values of the peak pressures and the pulse intensity integral remained virtually unchanged (within 3%) as the PRF varied from 0.1 to 13 kHz (Fig. 3). The standard deviations were found to be insignificant, indicating that the transmitted ultrasonic pulses produced for color Doppler imaging were highly stable. The PRF was not observed to have an effect on transmitted ultrasonic pulses, which suggests that the PRF also does not affect the magnitude of the ARF produced by the transmitted ultrasonic pulse that irradiates the target.

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