STANDARDIZATION OF THE PROTOCOL FOR ATTENUATION COEFFICIENT MEASUREMENT
The assessment of liver fat content is important in patients suspected of or diagnosed with chronic liver disease. Non-alcoholic fatty liver disease (NAFLD) is defined by the presence of hepatic fat content ≥5% of hepatocytes. NAFLD is currently the most common chronic liver disease worldwide with an estimated prevalence of 5-30% in the general population and in 55% up to 80% of patients with type 2 diabetes. New ultrasound methods for a non-invasive and quantitative assessment of the liver fat content have recently been developed. They are based on the estimation of the attenuation coefficient of the ultrasound beam.
Our group has conducted studies to evaluate the performance of the attenuation coefficient available on the Aplio i800 ultrasound system (ATI, Canon Medical Systems). The Aplio i800 ultrasound system has already a CE mark, and is available at our Ultrasound Unit for research purposes. ATI has showed a high accuracy for the quantification of liver fat, and was more accurate than the controlled attenuation parameter (CAP, FibroScan) in assessing significant steatosis. The aim of the study is therefore the optimization of the acquisition protocol of ATI measurements on the system Aplio i800, which has already a CE mark.
Studieoversigt
Status
Status
Betingelser
Betingelser
Undersøgelsestype
Undersøgelsestype
Tilmelding (Faktiske)
Tilmelding
Kontakter og lokationer
Studiesteder
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Pavia
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Pavia, Pavia, Italien, 27100
- Fondazione IRCCS Policlinico San Matteo, SSD Malattie Infettive 3 - Ecografia
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Deltagelseskriterier
Berettigelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
- Voksen
- Ældre voksen
Tager imod sunde frivillige
Prøveudtagningsmetode
Studiebefolkning
Beskrivelse
Inclusion Criteria:
- Informed consent
- Healthy adult volunteers (> 18 years)
- Ability to suspend respiration for image acquisition
Exclusion Criteria:
- Pregnancy
- age < 18 years
- Presence of ascites, acute viral hepatitis, transaminase flares, congestive heart failure, infiltrative diseases.
- No major medical conditions and in particular no known hepatic diseases
- Any other condition that, upon clinical judgment of the investigator, will make unacceptable the study participation for that individual subject
- Consent withdrawal
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
Hvad måler undersøgelsen?
Primære resultatmål
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
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evaluation of the concordance of attenuation coefficient measurements taken with different technical approaches
Tidsramme: up to 3 years
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Technical parameters considered are the position of the transducer, Breath-hold versus free breathing , Depth dependency, Intercostal approach vs subcostal vs left lobe, Separate acquisition of the attenuation coefficient versus simultaneous acquisition in "QUAD view" mode (stiffness / dispersion / ATI), Measurements of the attenuation coefficient using different ultrasound windows
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up to 3 years
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Sekundære resultatmål
Sekundære resultatmål
Resultatmål |
Tidsramme |
|---|---|
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evaluation of the different parameters for measuring the attenuation coefficient determinates limits of agreement (LoA) that are larger than a pre-defined maximum allowed difference (Δ) in a Bland and Altman plot
Tidsramme: up to 3 years
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up to 3 years
|
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evaluation of the results and whether they are influenced by food intake
Tidsramme: up to 3 years
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up to 3 years
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evaluation of the results and whether they are influenced by the level of hydration
Tidsramme: up to 3 years
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up to 3 years
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Samarbejdspartnere og efterforskere
Sponsor
Sponsor
Datoer for undersøgelser
Studer store datoer
Studiestart (Faktiske)
Studiestart
Primær færdiggørelse (Faktiske)
Primær færdiggørelse
Studieafslutning (Faktiske)
Studieafslutning
Datoer for studieregistrering
Først indsendt
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først indsendt, der opfyldte QC-kriterier
Først opslået (Faktiske)
Først opslået
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Faktiske)
Sidste opdatering sendt
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
Andre undersøgelses-id-numre
- p_93273
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