News tagged with radiation dose
New X-ray breast cancer imaging possible with 25 times reduced radiation dose
Scientists have developed a way to produce three-dimensional X-ray images of the breast at a radiation dose that is lower than the 2D radiographies used in clinics today. The new method enables the production ...
Cancer
Oct 22, 2012 |
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Mathematical models out-perform doctors in predicting cancer patients' responses to treatment
Mathematical prediction models are better than doctors at predicting the outcomes and responses of lung cancer patients to treatment, according to new research presented today (Saturday) at the 2nd Forum of the European Society ...
Cancer
Apr 20, 2013 |
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Radiation for breast cancer can harm hearts, study finds
Women treated with radiation for breast cancer are more likely to develop heart problems later, even with the lower doses used today, new research suggests. The risk comes from any amount of radiation, starts ...
Cardiology
Mar 13, 2013 |
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Older breast cancer patients see more complications with brachytherapy
heralded for its low complication rates—actually results in more complications than whole-breast radiation one year after treatment, Yale School of Medicine researchers report in the October issue of the Journal of Clinical On ...
Cancer
Oct 22, 2012 |
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Research could lead to new ways to ID women who have higher risk of breast cancer from low-dose radiation
(Medical Xpress)—Scientists from the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) have identified tissue mechanisms that may influence a woman's susceptibility or resistance ...
Cancer
Oct 16, 2012 |
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Cardiologists dramatically cut patient radiation exposure from X-rays
Each year, hundreds of thousands of X-rays are performed across the country to help detect and treat common cardiovascular conditions such as coronary artery disease, valve disease and other heart problems. However, concern ...
Cardiology
Aug 20, 2012 |
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Novel radiation therapy safely treats prostate cancer and lowers the risk of recurrence
A recent Phase I/II clinical trial has shown that a new combination of radiation therapies developed at Virginia Commonwealth University Massey Cancer Center escalates radiation doses to safely and effectively treat prostate ...
Cancer
Jun 26, 2012 |
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Gamma rays in background radiation linked to childhood leukaemia
(Medical Xpress) -- A small but statistically significant link between risk of childhood leukaemia and the gamma rays we are all exposed to from our natural environment has been detected in a very large study ...
Cancer
Jun 12, 2012 |
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Obese patients face higher radiation exposure from CT scans -- but new technology can help
Most medical imaging equipment is not designed with overweight and obese patients in mind. As a result, these individuals can be exposed to higher levels of radiation during routine X-ray and CT scans.
Medical research
Apr 05, 2012 |
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New take on impacts of low dose radiation
Researchers with the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab), through a combination of time-lapse live imaging and mathematical modeling of a special line of ...
Cancer
Dec 20, 2011 |
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Study faults partial radiation for breast cancer
New research casts doubt on a popular treatment for breast cancer: A week of radiation to part of the breast instead of longer treatment to all of it.
Cancer
Dec 06, 2011 |
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Study shows an ancient crop effective in protecting against a 21st century hazard
Flax has been part of human history for well over 30,000 years, used for weaving cloth, feeding people and animals, and even making paint. Now, researchers from the Perelman School of Medicine at the University of Pennsylvania ...
Cancer
Aug 09, 2011 |
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Two genetic variations predict second cancers after radiation for children with Hodgkin's lymphoma
A genome-wide association study published in the August issue of Nature Medicine has found two tiny genetic variations that can predict which patients with Hodgkin's lymphoma are most likely to develop radiat ...
Cancer
Jul 24, 2011 |
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MDCT arthrography accurately identifies
MDCT arthrography is better than MR arthrography for diagnosing glenoid rim osseous lesions, lesions that have been identified as potential causes of recurrence after shoulder surgery, according to a new study.
Other
May 04, 2011 |
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New therapy holds promise for aggressive breast cancers
Australian researchers have developed a new therapy to treat a common and aggressive form of breast cancer and stop the disease spreading, with a 100% success rate reported in mice.
Cancer
Apr 16, 2013 |
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Absorbed dose
Absorbed dose (also known as total ionizing dose, TID) is a measure of the energy deposited in a medium by ionizing radiation. It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg, which is given the special name Gray (Gy).
Note that the absorbed dose is not a good indicator of the likely biological effect. 1 Gy of alpha radiation would be much more biologically damaging than 1 Gy of photon radiation for example. Appropriate weighting factors can be applied reflecting the different relative biological effects to find the equivalent dose.
The risk of stochastic effects due to radiation exposure can be quantified using the effective dose, which is a weighted average of the equivalent dose to each organ depending upon its radiosensitivity.
When ionising radiation is used to treat cancer, the doctor will usually prescribe the radiotherapy treatment in Gy. When risk from ionising radiation is being discussed, a related unit, the sievert is used.
For more information about Absorbed dose, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
