Related Experiment Video
Updated: Aug 14, 2026
09:30
Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
Published on: December 18, 2016
Brain cancer risk and electromagnetic fields (EMFs): assessing the geomagnetic component
T E Aldrich1, K W Andrews, A R Liboff
1Merck Medco Managed Care Franklin, New Jersey, USA.
Archives of Environmental Health
|September 27, 2001
Summary
This study investigated brain cancer risk in North Carolina, examining the interaction between geomagnetic fields and power line electromagnetic fields. Results suggest potential links and highlight the value of geographic information systems in environmental risk assessment.
Area of Science:
- Environmental Epidemiology
- Geophysics
- Neuro-oncology
Background:
- Cancer cluster studies in North Carolina revealed elevated brain cancer risks in specific communities.
- Previous research prompted case-control studies to investigate potential environmental factors.
- This study integrates geomagnetic fields and power line electromagnetic fields in brain cancer risk assessment.
Purpose of the Study:
- To assess the combined effects of geomagnetic fields and power line electromagnetic fields on brain cancer risk.
- To evaluate confounding factors such as residential and case characteristics.
- To explore the ion cyclotron resonance mechanism as a potential disease risk model.
Main Methods:
- Case-control study design in a 4-county region of central North Carolina.
- Inclusion of detailed geographic information on residence at diagnosis.
- Logistic regression models incorporating geomagnetic field components and proximity to power lines.
Main Results:
- Models integrating geomagnetic and power line field effects were complex and challenging to interpret.
- Modeled values at varying distances from power lines were provided for analysis.
- The study demonstrated the utility of large databases and Geographic Information System (GIS) techniques for ecologic risk assessment.
Conclusions:
- Geographic Information System techniques are valuable for assessing ecologic environmental risks.
- Exposure classification compatible with theoretical electromagnetic field biological mechanisms shows promise.
- Further research is needed to clarify the complex interactions and refine risk models.
Related Concept Videos
02:59Cancer Prevention
Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...
Some...
01:28Magnetic Fields
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
01:22Motional Emf
Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...
01:27Induced Electric Fields: Applications
An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
01:24Magnetic Resonance Imaging
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
01:31Electromagnetic Fields
Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of Gauss's...
However, the observation of Gauss's...