PMID: 6399170Oct 1, 1984Paper

Ultrasound attenuation measurements of the liver in vivo using a commercial sector scanner

Ultrasonic Imaging
B S GarraM A Russell

Abstract

Attenuation measurements of various tissue mimicking phantoms and three different groups of patients were obtained using a modified commercial sector scanner. Estimates of attenuation were made using the spectral shift method with mean frequencies at different depths of a region of interest being obtained by both zero crossing and fast Fourier transform techniques. The accuracy and precision of both techniques was compared in phantoms and it was found that the FFT technique yielded less day-to-day variation (SD=3 percent) than the zero crossing technique (5 percent). For larger regions of interest, the range of variation in both techniques was more similar. Day-to-day variation in livers of normal patients was much larger than that seen in phantoms (10 to 15 percent) suggesting that in vivo measurements may be less precise due to actual daily changes in patients' livers. Attenuation estimates of phantoms were high by approximately 0.16 dB/MHz/cm compared to values obtained by transmission techniques. The attenuation values of livers in a group of 31 normal patients ranged from 0.214 dB/cm/MHz to 0.849 dB/cm/MHz with a mean of 0.627 +/- 0.126 dB/cm/MHz for the zero crossing technique while the mean value using the FFT technique ...Continue Reading

References

Jul 1, 1979·AJR. American Journal of Roentgenology·B B GosinkG R Leopold
Apr 1, 1984·Ultrasonic Imaging·N F MakladV Balsara
Apr 1, 1984·Ultrasonic Imaging·S ShafferM Nassi
Apr 1, 1983·Ultrasonic Imaging·S W FlaxM McLachlan
Jul 1, 1982·Ultrasonic Imaging·J OphirR H Bigelow

❮ Previous
Next ❯

Citations

Feb 14, 2004·Ultrasound in Medicine & Biology·Vesna ZdericRoy W Martin
Jul 1, 1994·Journal of Microscopy·A F van der SteenP C de Wilde
Dec 1, 1994·Baillière's Clinical Gastroenterology·U Patel, W R Lees
Jun 21, 2007·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·I RivensH Morris
Feb 24, 2007·Ultrasound in Medicine & Biology·Martin StrowitzkiKlaus-Vitold Jenderka
Jan 1, 1988·Ultrasound in Medicine & Biology·A DuerinckxL A Ferrari
Sep 1, 2015·Ultrasound in Medicine & Biology·Christina P KeravnouMichalakis A Averkiou
Dec 1, 2007·Journal of Medical Ultrasonics·Takashi ItoKazuo Maeda
Dec 17, 2005·European Journal of Gastroenterology & Hepatology·Agnes SzebeniAttila Zalatnai
Jul 9, 2002·Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine·Yasutomo FujiiTakashi Itoh
Nov 11, 2003·Journal of Ultrasound in Medicine : Official Journal of the American Institute of Ultrasound in Medicine·Yasutomo FujiiKiyoka Omoto

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.