Body Composition/Bone Density Facility
The Body Composition/Bone Density Facility provides access to state-of-the-art methods for measuring body composition and bone density in humans. Under the direction of Michael Jensen, M.D., the facility's staff offer Mayo researchers advice and assistance in the use of body composition/bone density techniques to address relevant experimental questions. The services and equipment chosen for this facility are those that are currently heavily utilized by Mayo investigators.
The facility serves researchers studying a wide variety of topics, including metabolic, cardiovascular, respiratory, muscle and bone-related diseases.
Consolidating body composition and bone density measurement technology into one shared facility benefits Mayo investigators, as it provides an area with concentrated expertise to assist in study design and interpretation.
Services and equipment
Dual energy X-ray absorptiometry (DEXA)
- General Electric (GE) Lunar Prodigy DEXA whole body scanner (forearm, anterior/posterior [AP] and lateral spine, hip, morphormetic spine measurements)
- GE Lunar iDEXA whole body scanner — incorporates significant design changes over the facility's previous densitometer
- Spatial resolution of the detectors has been improved by a factor of two, enhancing image quality and thereby leading to better definition and detection of bone edges. Improved detection of bone edges allows the software algorithms to calculate bone density with improved precision and accuracy.
- Use of a stronger X-ray (adjustable up to a factor of three) and the strengthening of the patient table. These two changes are important as they now allow, for the first time, evaluation of obese subjects up to 450 pounds.
Measuring visceral fat by computed tomography (CT) scanning
The facility coordinates access for clinical and translational investigators to measurements of visceral and subcutaneous abdominal adipose tissue content via the Mayo Clinic Department of Radiology. Single-slice CT images of the abdomen at the L2 (vertebra) interspace level are provided for a fee. The scans are performed with a Siemens Sensations 64 CT slice; the images are analyzed using Tomovision SliceOmatic software.
3D-pQCT (Xtreme CT)
High resolution images of the distal radius and distal tibia are obtained using the Scanco 3D-pQCT device (Xtreme CT). This is the first device of its kind that allows for noninvasive assessment of bone microstructure.
Accessing the facility
Approval from both the Mayo Clinic Institutional Review Board (IRB) and the Radiation Safety Committee is required before an investigator may use the Body Composition/Bone Density Facility. Requests for use are initiated through completion of the Clinical Research Unit (CRU) section of the IRBe application.
During the protocol development process, Body Composition/Bone Density Facility staff can assist with study design and advise which facility resources would best suit the needs of a particular study. During the study, technical support is provided by staff with limited radiography certification. Upon completion of the study, scan results are given to the investigational team.
Location and hours
A Lunar iDEXA is located in the Body Composition/Bone Density Facility on Joseph 5, Saint Marys CRU. The Lunar Prodigy DEXA, a Lunar iDEXA and the Xtreme CT are located in the Charlton CRU. Other CT instruments used are in Saint Marys Hospital, one floor above the Body Composition/Bone Density Facility.
Facility hours are Monday-Friday from 7 a.m. to 4 p.m. Studies requiring measurements outside these times require investigative teams to work directly with facility staff to determine coverage of involved measurements.