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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

Typical color Doppler images.The images were obtained for a circular +15 dB contrast scattering target at the pulse repetition frequencies (PRFs) of 0.1, 0.3, and 0.6 kHz, over up to 14 seconds from the onset of image acquisition, showing that the extent of color twinkling rapidly reduced as the PRF increased.
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f4-usg-14065: Typical color Doppler images.The images were obtained for a circular +15 dB contrast scattering target at the pulse repetition frequencies (PRFs) of 0.1, 0.3, and 0.6 kHz, over up to 14 seconds from the onset of image acquisition, showing that the extent of color twinkling rapidly reduced as the PRF increased.

Mentions: Typical color Doppler images (Fig. 4) were obtained for the circular +15 dB scattering contrast target at the nominal PRF values of 0.1, 0.3, and 0.6 kHz, over for a period extending up to 14 seconds from the onset of image acquisition. Less twinkling appeared as the PRF increased and twinkling artifacts could not be seen at PRF settings of 0.6 kHz or higher in color Doppler images (Fig. 4). The twinkling colors changed randomly over time, which can be attributed to random Doppler noises. This change is illustrated by the time history of the color pixel number within the target, which was displayed for 12 seconds at the nominal PRF settings of 0.1, 0.3, and 0.6 kHz (Fig. 5A). The temporal mean values of the extent of color twinkling were highest at the lowest PRF (0.1 kHz) and exponentially decreased as the PRF increased. A similar trend was found in the temporal variability of the twinkling plotted against the PRF (Fig. 5B).


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

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

Typical color Doppler images.The images were obtained for a circular +15 dB contrast scattering target at the pulse repetition frequencies (PRFs) of 0.1, 0.3, and 0.6 kHz, over up to 14 seconds from the onset of image acquisition, showing that the extent of color twinkling rapidly reduced as the PRF increased.
© Copyright Policy
Related In: Results  -  Collection

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

f4-usg-14065: Typical color Doppler images.The images were obtained for a circular +15 dB contrast scattering target at the pulse repetition frequencies (PRFs) of 0.1, 0.3, and 0.6 kHz, over up to 14 seconds from the onset of image acquisition, showing that the extent of color twinkling rapidly reduced as the PRF increased.
Mentions: Typical color Doppler images (Fig. 4) were obtained for the circular +15 dB scattering contrast target at the nominal PRF values of 0.1, 0.3, and 0.6 kHz, over for a period extending up to 14 seconds from the onset of image acquisition. Less twinkling appeared as the PRF increased and twinkling artifacts could not be seen at PRF settings of 0.6 kHz or higher in color Doppler images (Fig. 4). The twinkling colors changed randomly over time, which can be attributed to random Doppler noises. This change is illustrated by the time history of the color pixel number within the target, which was displayed for 12 seconds at the nominal PRF settings of 0.1, 0.3, and 0.6 kHz (Fig. 5A). The temporal mean values of the extent of color twinkling were highest at the lowest PRF (0.1 kHz) and exponentially decreased as the PRF increased. A similar trend was found in the temporal variability of the twinkling plotted against the PRF (Fig. 5B).

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