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Technical Validation of Lunar iDXA Visceral Fat Tool

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01110161
Recruitment Status : Completed
First Posted : April 26, 2010
Last Update Posted : December 8, 2010
Information provided by:
GE Healthcare

Brief Summary:
The goal of this project is to compare visceral fat measurements derived from Lunar iDXA total body scans and from Computed Tomography (CT) scans of the abdominal region for a Chinese population.

Condition or disease Intervention/treatment
Obesity Device: Visceral fat mass measurement

Detailed Description:

Obesity is one of the greatest public health challenges of the 21st century. The World Health Organization (WHO) estimates for 2005 indicate approximately 1.6 billion adults are overweight (body mass index (BMI) > 25 kg/m2), with 400 million being characterized as obese (BMI > 30 kg/m2). By 2015, the WHO projections predict that the populations of overweight and obese adults will increase to 2.3 billion and 700 million respectively. The major determinant of obesity is the energy imbalance between calorie intakes and expenditures, which can be ascribed to a global dietary shift in favor of energy-dense foods particularly rich in fat and carbohydrates, and a global trend towards sedentary behaviors.

Body fat distribution and abdominal fat in particular is correlated with increased risk of cardiovascular disease, diabetes, hypertension, nonalcoholic fatty liver disease, cancer, and total mortality. It is therefore important to develop minimally invasive clinical tools to assess visceral fat. Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) represent the gold standards for the quantification of visceral and abdominal fat. However, the analytical cost and the limited availability of these instruments for large-scale screenings have encouraged the development of alternative methods based on cost effective and widely distributed technologies. Dual-energy x-ray absorptiometry (DXA) is a promising technology to fill this gap. DXA is being used increasingly as a rapid, precise, and accurate method for measurement of regional and total body composition in both clinical and research settings. Total body assessment using DXA provides a unique capability of non-invasive measurement of skeletal bone status, as well as lean and fat tissue components including percent fat, lean tissue mass, and the android (waist)/gynoid (hip) fat ratio. The DXA technology is well suited to large-scale screening for assessing body composition and fat distribution as a part of a global assessment of metabolic status.

A recent study of a cross-sectional sample of 5440 US adults participating in the NHANES surveys 1999-2004 showed that 29.2% of obese men and 35.4% of obese women (a total of approximately 19.5 million US adults) are metabolically healthy, (sometimes referred to as "uncomplicated" obesity), whereas 30.1% of normal-weight men and 21.1% of normal-weight women (a total of approximately 16.3 million US adults) exhibit clustering of two or more cardiometabolic abnormalities. This study concluded that additional research is required to understand the physiological mechanisms underlying these differences. Another recent study of more than 3000 participants drawn from the Framingham Heart Study showed that both subcutaneous fat and visceral fat were correlated with metabolic risk factors. However, only the effects of visceral fat remain significant after adjusting for common anthropometric indices such as waist circumference and BMI. The issues surrounding cardiometabolic risk among different phenotypes along with the increased risks associated with visceral fat suggests the need to measure visceral adipose tissue in a diverse population.The gold standard, CT, is not a practical solution due to the cost and radiation exposure associated with the measurement. Therefore, it is important to develop a low-cost, low-radiation screening method for measuring visceral adipose tissue.

The present study aims at measuring abdominal fat distribution (CT scan and Lunar iDXA) in 120 adults. These data provide the possibility to validate a new method for measuring abdominal fat distribution (visceral versus subcutaneous fat) against the gold standard, CT. If validated, such a protocol based on Lunar iDXA could offer a rapid and cost effective diagnostic tool for fat distribution assessment of individuals as a basis for future personalized and health care programs.

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Study Type : Observational
Actual Enrollment : 148 participants
Observational Model: Cohort
Time Perspective: Cross-Sectional
Official Title: Technical Validation of Lunar iDXA Visceral Fat Tool
Study Start Date : January 2010
Actual Primary Completion Date : November 2010
Actual Study Completion Date : November 2010

Group/Cohort Intervention/treatment
Visceral fat mass
The study population will include Chinese adult men and women, over the age of 18 years. All subjects will be recruited at Fudan University. Subjects will represent a wide range of BMI values (18.5 - 40 kg/m2).
Device: Visceral fat mass measurement
Total body DXA measurement, Abdominal CT scan
Other Name: Lunar iDXA (GE Healthcare)

Primary Outcome Measures :
  1. Agreement between Lunar iDXA and CT measured visceral fat of the abdominal region [ Time Frame: Both measurements made during initial visit, on the same day; no follow-up or additional procedures. Analysis of results to be completed within 3 months. ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
Ages 18 and up, BMI between 18.5 and 40

Inclusion Criteria:

  • Age: 18 +
  • BMI: 18.5 - 40
  • Subject willing to provide informed consent

Exclusion Criteria:

  • Subject who is affected by any diagnosed eating disorder
  • Pregnancy
  • Subject who is unable or unwilling to give consent
  • Subjects who may not be good trial participants based on investigator's discretion

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01110161

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Fudan University Zhongshan Hospital
Shanghai, China, 200032
Sponsors and Collaborators
GE Healthcare
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Principal Investigator: Xin Gao, MD Shanghai Zhongshan Hospital
Study Director: David Ergun, PhD GE Healthcare Lunar

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Responsible Party: Xin Gao, MD, Fudan University Zhongshan Hospital Identifier: NCT01110161     History of Changes
Other Study ID Numbers: Fudan-2009-04
First Posted: April 26, 2010    Key Record Dates
Last Update Posted: December 8, 2010
Last Verified: December 2010
Keywords provided by GE Healthcare:
Abdominal Fat
Visceral Fat
Subcutaneous Fat
Dual-energy x-ray absorptiometry
Computed Tomography
Body Mass Index
Body composition
Percent fat
Waist circumference
Hip circumference