Calibrating Imaging Techniques to Study Blood Flow

This study has been completed.
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00546091
First received: October 17, 2007
Last updated: February 19, 2014
Last verified: October 2012

October 17, 2007
February 19, 2014
October 2007
Not Provided
Not Provided
Not Provided
Complete list of historical versions of study NCT00546091 on ClinicalTrials.gov Archive Site
Not Provided
Not Provided
Not Provided
Not Provided
 
Calibrating Imaging Techniques to Study Blood Flow
Calibration of Non-Invasive Non-Ionizing Imaging Techniques to Study Vasculature of Healthy Volunteers

This study will explore the uses of three noninvasive imaging techniques-thermography, laser Doppler imaging, and multispectral imaging-to test the blood flow of healthy volunteers. By comparing these three techniques, researchers will be able to train these imaging systems to better evaluate skin types and blood flow. The study will also test computer programs that have been developed to correct for the effects of curvature and body hair on the images.

Healthy volunteers must be older than 18 years of age and may not have had a history of malignant tumors, skin disease, or vascular disease.

Participants will undergo the following procedures on an outpatient basis:

Three different types of images taken of the participant s forearm

  • Thermography infrared thermal imaging to map skin temperature
  • Laser Doppler imaging low-powered laser imaging to map blood flow in the skin
  • Multispectral imaging near-infrared light imaging to measure total blood flow and oxygen levels in the skin

A reactive hyperemia experiment, in which multispectral images will be taken of the participant s forearm during and after the use of a blood pressure cuff

A hair removal experiment, in which images will be collected of the participant s forearm in separate scans done before and after the hair is removed with a topical hair removal solution

The entire series of exams will take approximately one hour to perform.

This study is designed to calibrate three non-invasive and non-ionizing imaging techniques on 12 healthy volunteers. The three imaging techniques-- thermography, laser Doppler imaging and multi-spectral imaging-- have been approved since 2001 for four clinical protocols already approved by the NIH/NCI IRB for use on patients with Kaposi s sarcoma (KS). However, as our laboratory continues to study and analyze the images collected on these protocols, we have found that our analysis algorithms require some additional data from healthy volunteers.

We aim to use the information we gather from healthy volunteers on this protocol to train our imaging systems and calibrate our analysis methods to validate the results of the KS data already collected. We aim to study different skin types, such as Caucasian, Asian and African American, so that we can calibrate the melanin input value in our multi-spectral imaging reconstruction algorithm. We also need to study the vasculature networks in the forearms of the volunteers to compare to 'normal' values in the literature for the parameters we are exploring, including temperature, vasculature, blood volume and blood oxygenation to validate our reconstruction algorithm. We will also perform experiments of reactive hyperemia, where the arm of the volunteer is occluded with an arm pressure cuff for five minutes, to study how blood volume and blood oxygenation change during the experiment. Trends of increasing/decreasing blood volume and blood oxygenation can also be compared with published literature to validate our reconstruction algorithm.

Since we started collecting data from the KS patients, we have noticed that hair and curvature of the surface of the skin interfere with our analysis techniques as well. Therefore, we aim to assess algorithms developed to remove the effects of curvature and hair on the images as part of our image analysis training. The intensity in the images is affected by the curvature and must be corrected. We have developed algorithms to correct for this curvature, but need to study normal disease-free skin to make sure that the values for blood volume and blood oxygenation remain the same after the curvature correction is performed. We also plan to collect images from a healthy volunteer s arm, remove the hair from the arm using a topical hair removal solution, and then image the arm again. With this information, we can optimize our hair removal algorithm. Combining all of the aforementioned information will allow us to develop a non-invasive strategy for repeated serial assessments of tissue vasculature.

When following KS lesions over time, the vascular / metabolic changes in the lesion are important. An additional parameter is of interest when following the treatment over time, which is the structure of the lesion. Optical Coherence Tomography (OCT) is a non-invasive, non-contact optical imaging technology, which provides this desired structural information with high resolution and in three dimensions (3D) over the area of interest. Therefore we aim to combine OCT with multi-spectral data, relating the metabolic state of the tissue with structure. By doing this, we hypothesize that we can not only get deeper understanding of tissue vasculature, but that we can also improve the multi-spectral imaging modality, by using the structure as prior information for the reconstruction.

Observational
Time Perspective: Prospective
Not Provided
Not Provided
Not Provided
Not Provided
Healthy Volunteers Only
Not Provided
Not Provided

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
15
October 2012
Not Provided
  • INCLUSION CRITERIA:

Age 18 years or greater.

EXCLUSION CRITERIA:

  • Healthy volunteers with any skin disease.
  • Past or present history of malignant tumors.
  • Past or present hematologic abnormality of Hgb less than 9.0 gm/dl.
  • Healthy volunteers with any past or present vein disease.
  • Any medical condition that, in the opinion of the Principal Investigator, would preclude the inclusion of a patient onto this research study.
  • Unable or unwilling to give informed consent.
Both
18 Years and older
Yes
Contact information is only displayed when the study is recruiting subjects
United States
 
NCT00546091
080001, 08-CH-0001
Not Provided
Not Provided
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
Not Provided
Principal Investigator: Amir Gandjbakhche, Ph.D. Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
National Institutes of Health Clinical Center (CC)
October 2012

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP