Magnetization Transfer Quantitation and Characterization for Clinical Scanners

NCT00001714 | Completed

• 2 other identifiers: 98008498-CC-0084
• Study Type: observational
• Target: 100
• Locations: 1 country
• Sites: 1

Brief Summary

This project will measure magnetization transfer (MT) parameters on normal subjects using two novel approaches. The first is the investigation of asymmetric MT effects with respect to the zero or on-resonance reference point. The technique measures the difference in MT effect between two symmetrically positioned off-resonance MT pulses in the positive and negative frequency ranges. Prior research with this technique in the kidney show a difference in the macromolecular lineshape that correlates to a specific metabolite. The second approach, utilizing a subset of the acquisitions from the first approach, will test newly developed formulation to calculate the macromolecular fraction, or fraction of proton density that accounts for MT. We foresee these measurements may significantly develop our understanding of MT and introduce diagnostic and quantitative tools to study human tissues.

Conditions

Healthy

Keywords

MRI; Macromolecules; Magnetization Transfer; Metabolites; Tissue Characterization; Normal Volunteer

Eligibility Criteria

• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

Normal control between the ages of 18 - 70 years of age who are capable of giving informed consent. Subjects must not have a condition which would preclude their use for technical development (e.g. paralyzed hemidiaphragm, morbid obesity, claustrophobia, etc.). Subjects must not have a condition which would present unnecessary risks (e.g. pregnancy, surgery of uncertain type, symptoms of pheochromocystoma or insulinoma, etc.). Lactating women and subjects with hemoglobinopathies, asthma, or renal or hepatic disease will be excluded from studies involving the administration of contrast agents. Must not have a contraindication to MR scanning such as surgery that involves metal clips or wires which might be expected to concentrate radiofrequency fields or cause tissue damage from twisting in a magnetic field. Examples include: aneurysm clip; implanted neural stimulator; implanted cardiac pacemaker or autodefibrillator; cochlear implant; ocular foreign body (e.g. metal shavings); insulin pump.

Contact the study team to discuss eligibility requirements. They can help determine if this study is right for you.

Sponsors & Collaborators

• National Institutes of Health Clinical Center (CC): lead

Study Sites (1)

Warren G. Magnuson Clinical Center (CC)

Bethesda, Maryland, 20892, United States

Location

Related Publications (3)

• Bottomley PA, Foster TH, Argersinger RE, Pfeifer LM. A review of normal tissue hydrogen NMR relaxation times and relaxation mechanisms from 1-100 MHz: dependence on tissue type, NMR frequency, temperature, species, excision, and age. Med Phys. 1984 Jul-Aug;11(4):425-48. doi: 10.1118/1.595535.

  PMID: 6482839 BACKGROUND

• Wolff SD, Balaban RS. Magnetization transfer contrast (MTC) and tissue water proton relaxation in vivo. Magn Reson Med. 1989 Apr;10(1):135-44. doi: 10.1002/mrm.1910100113.

  PMID: 2547135 BACKGROUND

• Wolff SD, Balaban RS. Magnetization transfer imaging: practical aspects and clinical applications. Radiology. 1994 Sep;192(3):593-9. doi: 10.1148/radiology.192.3.8058919. No abstract available.

  PMID: 8058919 BACKGROUND

Study Design

• Study Type: observational
• Sponsor Type: NIH

Study Record Dates

• First Submitted: November 3, 1999
• First Posted: December 10, 2002
• Study Start: March 1, 1998
• Study Completion: July 1, 2001
• Last Updated: March 4, 2008

Record last verified: 2001-02

Locations

US (1)