Liver glycogen and water storage: Effect on ultrasound attenuation

Tuthill, T.A.; Baggs, Raymond B.; Parker, Kevin J.

doi:10.1016/0301-5629(89)90170-1

Cited by 21 publications

(11 citation statements)

References 6 publications

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“…Also, if we return to the three rats at a gestational age of 20 days where more than 3 mm of the cervix could be scanned, the standard deviation between the animals was 0.70 dB/cm-MHz, whereas the standard deviation for a particular animal was only 0.24 dB/cm-MHz on average. The variance in ultrasonic attenuation for tissue of the same type has been observed in other studies as well, e.g., glycogen in liver (Parker et al, 1988;Tuthill et al, 1989). Also, for example, many different attenuation coefficients for fat taken at different frequencies have been reported (Goss et al, 1978).…”

Section: Discussionsupporting

confidence: 64%

In vivo ultrasonic attenuation slope estimates for detecting cervical ripening in rats: Preliminary results

Bigelow

McFarlin

O’Brien

et al. 2008

The Journal of the Acoustical Society of America

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To effectively postpone preterm birth, cervical ripening needs to be detected and delayed. As the cervix ripens, the spacing between the collagen fibers increases and fills with water, hyaluronan, decorin, and enzymes suggesting that the ultrasonic attenuation of the cervix should decrease. The decrease in ultrasonic attenuation may be detectable, leading to an effective means of detecting cervical ripening. Herein, the traditional attenuation slope-estimation algorithm based on measuring the downshift in center frequency of the ultrasonic backscattered signal with propagation depth was modified and applied to the cervix of rats. The modified algorithm was verified using computer simulations and an ex vivo tissue sample before being evaluated in in vivo animal studies. Sphericallyfocused f/3 transducers with 33-MHz center frequencies and with 9-mm focal lengths were used in both the simulations and experiments. The accuracy was better than 15% in the simulations, and the attenuation slope of the cervix in the ex vivo experiment was 2.6±0.6 dB/cm-MHz, which is comparable to 2.5±0.4 dB/cm-MHz measured using a through-transmission insertion loss technique. For the in vivo experiments, a statistically significant effect of ultrasonic attenuation with gestational age was not observed. The large variances in the in vivo results were most likely due to the natural variation in attenuation for biological tissue between animals.

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Section: Discussionsupporting

confidence: 64%

In vivo ultrasonic attenuation slope estimates for detecting cervical ripening in rats: Preliminary results

Bigelow

McFarlin

O’Brien

et al. 2008

The Journal of the Acoustical Society of America

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“…Applications have included diagnosing diffuse liver disease42–45, monitoring tissue changes after high‐intensity ultrasound therapy46, assessing changes in the liver following prednisone treatment47, differentiating between benign and malignant tissue in the prostate48 and assessing the mineral content of bone49–52. Attenuation of tissue has been observed to decrease significantly as water concentration increases and density decreases53, 54. With the dynamic changes in cervix microstructure (increased collagen disorganization and decreased collagen concentration) and water concentration during the ripening process, it is reasonable to consider using attenuation to detect changes in the cervix that are associated with cervical ripening.…”

Section: Discussionmentioning

confidence: 99%

Ultrasonic attenuation estimation of the pregnant cervix: a preliminary report

McFarlin

Bigelow

Laybed

et al. 2010

Ultrasound in Obstet & Gyne

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“…Fasting condition of the patient: It has been suggested that patients should be fasting for eight hours before any scan to avoid the effects of changing the liver glycogen and water storage on ultrasound attenuation [12]. This particular issue may not be too critical due to the sound differences between patients having the same pathological condition.…”

Section: Roi Size and Shapementioning

confidence: 99%

A new measure of echogenicity of ultrasound images for liver classification

Singh

Gupta

2011

2011 24th Canadian Conference on Electrical and Computer Engineering(CCECE)

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This paper presents a new quantitative metric which can be used as indirect method for characterization of Liver Ultrasound images. This new metric is based upon the visual criterion considered by the radiologists using texture parameters of the Liver image and a measure of echogenicity. The proposed metric is a single parameter extracted from 7 texture features on the basis of Homogeneity, Roughness, Contrast, Granular-size and Orientation of the liver surface for classification into Fatty or Normal liver.

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Liver glycogen and water storage: Effect on ultrasound attenuation

Cited by 21 publications

References 6 publications

In vivo ultrasonic attenuation slope estimates for detecting cervical ripening in rats: Preliminary results

In vivo ultrasonic attenuation slope estimates for detecting cervical ripening in rats: Preliminary results

Ultrasonic attenuation estimation of the pregnant cervix: a preliminary report

A new measure of echogenicity of ultrasound images for liver classification

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