Echogenicity (misspelled sometimes as echogenecity) or echogeneity is the ability to bounce an echo, e.g. return the signal in medical ultrasound examinations. In other words, echogenicity is higher when the surface bouncing the sound echo reflects increased sound waves. Tissues that have higher echogenicity are called "hyperechogenic" and are usually represented with lighter colors on images in medical ultrasonography. In contrast, tissues with lower echogenicity are called "hypoechogenic" and are usually represented with darker colors. Areas that lack echogenicity are called "anechogenic" and are usually displayed as completely dark.[1]
Obstetric ultrasonography of twins at a gestational age of almost 9 weeks. The mother’s and the twins’ bodies have a higher echogenicity than the amniotic fluid around them. The standard representation is brighter color for higher echogenicity, giving the almost anechoic fluid an almost black appearance.
Echogenicity can be increased by intravenously administering gas-filled microbubble contrast agent to the systemic circulation, with the procedure being called contrast-enhanced ultrasound. This is because microbubbles have a high degree of echogenicity. When gas bubbles are caught in an ultrasonic frequency field, they compress, oscillate, and reflect a characteristic echo- this generates the strong and unique sonogram in contrast-enhanced ultrasound. Gas cores can be composed of air, or heavy gases like perfluorocarbon, or nitrogen.[2] Heavy gases are less water-soluble so they are less likely to leak out from the microbubble to impair echogenicity (McCulloch et al., 2000). Therefore, microbubbles with heavy gas cores are likely to last longer in circulation.
Reasons for higher echogenicityedit
During ultrasound examinations, sometimes echogenicity is higher in certain parts of body. Fatty liver could cause increased echogenicity in the liver, especially if the liver transaminases are elevated.[3]
^Ihnatsenka, Barys; Boezaart, André Pierre (2010). "Ultrasound: Basic understanding and learning the language". International Journal of Shoulder Surgery. 4 (3): 55–62. doi:10.4103/0973-6042.76960. PMC3063344. PMID 21472065.
^Lindner, JR (2004). "Microbubbles in medical imaging: current applications and future directions". Nature Reviews. Drug Discovery. 3 (6): 527–32. doi:10.1038/nrd1417. PMID 15173842. S2CID 29807146.
^Mathiesen, UL; Franzén, LE (2002). "Increased liver echogenicity at ultrasound examination reflects degree of steatosis but not of fibrosis in asymptomatic patients with mild/moderate abnormalities of liver transaminases". Scandinavian Journal of Gastroenterology. 34 (7). Department of Internal Medicine, County Hospital, Oskarshamn, Sweden: 516–22. doi:10.1016/s1590-8658(02)80111-6. PMID 12236486.
January 01, 1970
echogenicity, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, news, newspapers, books, scholar, jstor, july, 2010, l. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Echogenicity news newspapers books scholar JSTOR July 2010 Learn how and when to remove this message Echogenicity misspelled sometimes as echogenecity or echogeneity is the ability to bounce an echo e g return the signal in medical ultrasound examinations In other words echogenicity is higher when the surface bouncing the sound echo reflects increased sound waves Tissues that have higher echogenicity are called hyperechogenic and are usually represented with lighter colors on images in medical ultrasonography In contrast tissues with lower echogenicity are called hypoechogenic and are usually represented with darker colors Areas that lack echogenicity are called anechogenic and are usually displayed as completely dark 1 Obstetric ultrasonography of twins at a gestational age of almost 9 weeks The mother s and the twins bodies have a higher echogenicity than the amniotic fluid around them The standard representation is brighter color for higher echogenicity giving the almost anechoic fluid an almost black appearance Contents 1 Microbubbles 2 Reasons for higher echogenicity 3 See also 4 ReferencesMicrobubbles editEchogenicity can be increased by intravenously administering gas filled microbubble contrast agent to the systemic circulation with the procedure being called contrast enhanced ultrasound This is because microbubbles have a high degree of echogenicity When gas bubbles are caught in an ultrasonic frequency field they compress oscillate and reflect a characteristic echo this generates the strong and unique sonogram in contrast enhanced ultrasound Gas cores can be composed of air or heavy gases like perfluorocarbon or nitrogen 2 Heavy gases are less water soluble so they are less likely to leak out from the microbubble to impair echogenicity McCulloch et al 2000 Therefore microbubbles with heavy gas cores are likely to last longer in circulation Reasons for higher echogenicity editDuring ultrasound examinations sometimes echogenicity is higher in certain parts of body Fatty liver could cause increased echogenicity in the liver especially if the liver transaminases are elevated 3 Women with polycystic ovary syndrome may also show an increase in stromal echogenicity See also editContrast enhanced ultrasound Echogenic intracardiac focus Medical ultrasoundReferences edit Ihnatsenka Barys Boezaart Andre Pierre 2010 Ultrasound Basic understanding and learning the language International Journal of Shoulder Surgery 4 3 55 62 doi 10 4103 0973 6042 76960 PMC 3063344 PMID 21472065 Lindner JR 2004 Microbubbles in medical imaging current applications and future directions Nature Reviews Drug Discovery 3 6 527 32 doi 10 1038 nrd1417 PMID 15173842 S2CID 29807146 Mathiesen UL Franzen LE 2002 Increased liver echogenicity at ultrasound examination reflects degree of steatosis but not of fibrosis in asymptomatic patients with mild moderate abnormalities of liver transaminases Scandinavian Journal of Gastroenterology 34 7 Department of Internal Medicine County Hospital Oskarshamn Sweden 516 22 doi 10 1016 s1590 8658 02 80111 6 PMID 12236486 Retrieved from https en wikipedia org w index php title Echogenicity amp oldid 1222493908, wikipedia, wiki, book, books, library,
