News tagged with radiation dose
Bird populations near Fukushima are more diminished than expected
(PhysOrg.com) -- Low-level radiation in Fukushima Prefecture appears to have had immediate effects on bird populations, and to a greater degree than was expected from a related analysis of Chernobyl, an international ...
Feb 09, 2012 |
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Cyberknife radiation relieves stabbing pain of facial nerve condition
A technique that delivers highly focused beams of radiation, known as Cyberknife, can relieve the stabbing pain of the facial nerve condition trigeminal neuralgia, indicates a small study published online in the Journal of ...
Medicine & Health / Neuroscience
Jan 27, 2012 |
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Experts offer pointers for optimizing radiation dose in pediatric CT
An article in the January issue of the Journal of the American College of Radiology summarizes methods for radiation dose optimization in pediatric computed tomography (CT) scans. Approximately seven to eight million CT exa ...
Jan 06, 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 ...
Dec 20, 2011 |
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ACR in Choosing Wisely campaign to promote wise use of resources among physicians and patients
As part of its ongoing efforts to ensure safe, effective and appropriate medical imaging, the American College of Radiology has joined the ABIM Foundation and eight other medical specialty societies in Choosing Wisely. The ...
Dec 14, 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.
Dec 06, 2011 |
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Notre Dame, Purdue and GE Healthcare partner on "ultra low" radiation-dose, high clarity CT technology
Demonstrating their shared legacy of innovative research and commitment to patient-centered medical technology, the University of Notre Dame, Purdue University and GE Healthcare have announced the commercial ...
Dec 02, 2011 |
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Future cancers from Fukushima plant may be hidden
(AP) -- Even if the worst nuclear accident in 25 years leads to many people developing cancer, we may never find out.
Nov 20, 2011 |
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Preliminary report on radiation levels in Fukushima reveals relative safety of residents
Researchers have released a preliminary report on the effects of the Fukushima nuclear disaster on the surrounding areas, following radiation levels for approximately three months following the event and surveying more than ...
Nov 16, 2011 |
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Higher radiation dose does not help lung cancer patients live longer
A higher dose of radiation (74 Gy) does not improve overall survival for non-small cell lung cancer that has spread to the lymph nodes, compared to the standard radiation dose (60 Gy), according to an interim analysis of ...
Oct 03, 2011 |
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Consider the breast and lungs when determining thoracic imaging protocols
Carefully consider the radiation dose to the breast and lungs before deciding which CT protocol to use for thoracic imaging of individual patients, a new study cautions.
Oct 01, 2011 |
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Chemo plus radiation before surgery increases tumor response for rectal cancer
Rectal cancer patients who use a new combination of the chemotherapy, Capecitabine, together with five weeks of radiation (50 Gy) before surgery have an 88 percent chance of surviving the cancer three years after treatment, ...
Sep 26, 2011 |
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IMRT has less harmful rectal side effects than 3D-CRT for prostate cancer patients
Men with localized prostate cancer treated with a newer technology, intensity modulated radiation therapy (IMRT), have more than a quarter (26 percent) fewer late bowel and rectal side effects and a statistically improved ...
Sep 26, 2011 |
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The key to lower dose CT fluoroscopy for spine injections is reducing the dose of the planning CT
The radiation dose for a CT fluoroscopy is about half that for conventional fluoroscopy to guide epidural steroid injections, however, the dose is substantially more than conventional fluoroscopy when a full lumbar planning ...
Sep 22, 2011 |
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Research on US nuclear levels after Fukushima could aid in future nuclear detection
The amount of radiation released during the Fukushima nuclear disaster was so great that the level of atmospheric radioactive aerosols in Washington state was 10,000 to 100,000 times greater than normal levels in the week ...
Sep 09, 2011 |
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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.
