Promise of new imaging technologies for assessing ovarian function

Singh, Jaswant; Adams, Gregg P.; Pierson, R.A.

doi:10.1016/s0378-4320(03)00100-3

Cited by 65 publications

(53 citation statements)

References 83 publications

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“…Moreover, individual differences in visual perception of pixel brightness may result in inconsistency during exams. To overcome this limitation, computer algorithms can be used to transform images in a numeric matrix, which can be subsequently analyzed for mean pixel value and pixel heterogeneity (Singh et al, 1998(Singh et al, , 2003. Thus, this computer-assisted image analysis allows quantitative and objective assessment of sonographic image attributes, overcoming the subjectivity and low sensibility of visual analysis.…”

Section: Emerging Technologies: Computer-assisted Image Analysis and mentioning

confidence: 99%

“…In animal reproduction, computer-assisted image analysis has been used for the evaluation of CL, follicle, and uterine echotexture (Singh et al, 2003;Siqueira et al, 2009;Scully et al, 2015). Studies show that CL echotexture, for example, is associated with luteal tissue area (Singh et al, 1997), and reflect luteal function throughout the estrous cycle (Singh et al, 1997;Tom et al, 1998;Siqueira et al, 2009).…”

Section: Emerging Technologies: Computer-assisted Image Analysis and mentioning

confidence: 99%

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Current Status, Emerging Technologies, and Trends in Veterinary Ultrasonography Applied to Cattle Reproduction

Viana¹,

Siqueira²

2017

SPERMOVA

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The B-mode and color Doppler ultrasonography provide a safe, non-invasive, real-time approach to assess reproductive tissues and organs in female cattle, and thus have a number of potential uses in reproductive management. On the ovary, antral follicle population can be counted, and follicular growth, regression and ovulation can be monitored during sequential exams. The corpus luteum can be identified, and evaluated according to size, echotexture, and vascularization. Ultrasonography allows an early diagnosis of pregnancy based in the detection of the embryonic vesicle from day 24 of gestation. Alternatively, non-pregnancy can be indirectly inferred according to corpus luteum vascularization 20 days after insemination. Embryo and fetus morphology and vital signs can monitored throughout gestation, and fetal sex can be determined by the visualization of the relative position of the genital tubercle. In addition, a range of pathologic conditions of the ovary and uterus can be diagnosed based on sonographic images. The use of ultrasonography was also key for the development of many assisted reproductive technologies, such as timed artificial insemination, modern superovulation protocols, procedures for the recovery of cumulus-oocyte complexes aiming in vitro embryo production, and is a valuable tool for the selection and management of embryo recipients. In the future, emerging technologies such as computer-assisted image analysis, 3D ultrasonography, and 3D modeling have the potential to improve the accuracy of sonographic diagnosis, or even create new potential uses for ultrasonography in animal reproduction.Keywords: 3D ultrasound, bovine, color Doppler, pregnancy diagnosis, reproductive biotechnologies RESUMEN La ecografía de modo B y dopler color proporciona un enfoque seguro, no invasivo y en tiempo real para evaluar tejidos y órganos reproductivos en vacas, por lo tanto, tiene una serie de usos potenciales en el manejo reproductivo. En el ovario, se puede realizar el conteo de la población de folículos antrales, y realizar el seguimiento del crecimiento folicular, la regresión y la ovulación durante monitoreo secuencial. El cuerpo lúteo puede ser identificado y evaluarse según el tamaño, ecotextura y vascularización. La ecografía permite un diagnóstico precoz de la preñez basado en la detección de la vesícula embrionaria desde el día 24 de la gestación. Alternativamente, la ño preñez puede inferirse indirectamente de acuerdo con la vascularización del cuerpo lúteo a los 20 días después de la inseminación. La morfología y los signos vitales del embrión y del feto pueden monitorearse durante toda la gestación, y el sexo del feto puede determinarse mediante la visualización de la posición relativa del tubérculo genital. Además, se puede diagnosticar una variedad de condiciones patológicas del ovario y el útero según las imágenes ecográficas. El uso de ultrasonografía también fue clave para el desarrollo de muchas tecnologías de reproducción asistida, como la inseminación artificial a tiempo fijo, los pr...

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Section: Emerging Technologies: Computer-assisted Image Analysis and mentioning

confidence: 99%

Section: Emerging Technologies: Computer-assisted Image Analysis and mentioning

confidence: 99%

Current Status, Emerging Technologies, and Trends in Veterinary Ultrasonography Applied to Cattle Reproduction

Viana¹,

Siqueira²

2017

SPERMOVA

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“…Therefore, it is very important to monitor reproductive system when animal is in oestrus. Various noninvasive in vivo methods have been used to study reproductive events in female mammals (Bollwein et al, 2000;Singh et al, 2003). Now-a-days, oestrus or heat detector is used to monitor estrus and oestrous cycle.…”

Section: Introductionmentioning

confidence: 99%

Monitoring vaginal electrical impedance in crossbred cows during post-partum period

Malakar

Juyena

Paul

et al. 2017

Asian J. Med. Biol. Res

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Efficient and accurate detection of estrus and correct time of artificial insemination are essential for sustainable dairy farms. Therefore, this study was carried out to monitor oestrus by observing vaginal electrical impedance (VEI) in post-partum cows. Eighteen cows with 19-139 post-partum days were included for this study. Daily VEI values were measured with heat detector ® . Lower vaginal electrical resistance (VER) values were recorded during oestrus. VER of 210-240 Ω might be indicative for oestrus in cows. The day difference between two successive lower values or higher values in "VER waves" ranged from 18 to 22 days in cows which might indicates the oestrous cycle length. Marked variation existed between VER values of two successive peaks in pregnant and non-pregnant cows, and increased (P < 0.05) VER values were observed in 2 nd peak in pregnant cows. VER of 320-370 Ω at 19-22 days after AI could be considered for early pregnancy. The study suggests that the measurement of vaginal impedance could serve as an indicator of the oestrus in cows and daily impedance measurements are necessary to confirm the stages of the estrous cycle, correct time of AI and early pregnancy.

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“…This technique allows quantitative and objective assessments of brightness intensity and uniformity of each pixel composing an image by overcoming the subjectivity of visual analyses (8,14). Ultrasonographic images are composed of thousands of picture elements called pixels, and each pixel is represented numerically in a scale of 256 shades of grey (0=black; 255=white) according to their intensity (10,19).…”

Section: Introductionmentioning

confidence: 99%

“…Images are displayed as two-dimensional maps of grey scale based upon location and strength of the echoes returning from the tissue interfaces. In assessment of tissue echotexture, a mathematical matrix is generated using these numerical values, and two main variables are analysed: mean pixel value and pixel heterogeneity (14).…”

Section: Introductionmentioning

confidence: 99%

In vivo and in vitro assessment of ovarian echotexture through computer assisted real time ultrasonography in bitches

Erdoğan¹,

Küçük²

2017

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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Summary:In vivo and in vitro assessment of canine ovaries (n=72) were studied by computer assisted real time ultrasonography to analyse the correlation between the ovarian echotexture and serum progesterone (P4) concentration. Pre-and postoperative ovarian images were taken via B-mode ultrasonography, and analysed by an image analysis software package for total area of ovary (A), mean greyness value (MGV), heterogeneity (H), and minimum-maximum pixel value (PR). The ovaries were classified into follicular or luteal stage based upon the serum P4 concentration, vaginal cytology findings, and macroscopic inspection of ovaries postoperatively. The P4 was negatively (P<0.05) correlated with A, H and PR, whereas, it's correlation with MGV was positive (P<0.05) in follicular stage. Also, parameters A, H and PR were higher (P<0.05) in follicular stage. In vitro parameters of MGV, H and PR were higher (P<0.05) than in vivo parameters in follicular stage. Meanwhile, in luteal stage ovaries, only in vitro MGV was higher than in vivo MGV. In this study, it was observed that the relationship between ovarian echotexture and oestrous stages could be presented numerically. Moreover, the differences between the in vivo and in vitro ovarian images were more prominent in bitches in the follicular stage.

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Promise of new imaging technologies for assessing ovarian function

Cited by 65 publications

References 83 publications

Current Status, Emerging Technologies, and Trends in Veterinary Ultrasonography Applied to Cattle Reproduction

Current Status, Emerging Technologies, and Trends in Veterinary Ultrasonography Applied to Cattle Reproduction

Monitoring vaginal electrical impedance in crossbred cows during post-partum period

In vivo and in vitro assessment of ovarian echotexture through computer assisted real time ultrasonography in bitches

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