News tagged with radiation dose
Researchers provide prospective on low-dose radiation biology controversy
A review of the current issues in low-dose radiation research authored by two radiation biologists from the Pacific Northwest National Laboratory is the cover story of the May 2013 issue of Radiation Research. The re ...
Cancer
May 14, 2013 |
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Intensity modulated radiotherapy reduces side effects in patients with early breast cancer
Intensity modulated radiotherapy (IMRT) gives better results than standard radiotherapy in patients with early breast cancer, according to results from a randomised trial presented today (Sunday) to the 2nd Forum of the European ...
Cancer
Apr 21, 2013 |
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Commonly used drug can limit radiation damage to lungs and heart for cancer patients
Unavoidable damage caused to the heart and lungs by radiotherapy treatment of tumours in the chest region can be limited by the administration of an ACE inhibitor, a drug commonly used in the treatment of cardiovascular disease, ...
Cancer
Apr 21, 2013 |
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New radiotherapy approach reduces symptoms of dry mouth in patients with head and neck cancers
Researchers have shown for the first time that it is possible to reduce the distressing symptoms of dry mouth in patients treated with radiotherapy for head and neck cancers if the radiation dose to a salivary gland (called ...
Cancer
Apr 20, 2013 |
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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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Two views are better than one in 3-D breast screening
One view 3D breast screening (tomosynthesis) means less radiation dose and about five seconds less compression, but a study from Yale University, New Haven, CT, found that obtaining both views is necessary to help ensure ...
Cancer
Apr 19, 2013 |
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Radiation dose level affects size of lesions seen on chest CT images
The estimated size of chest lymph nodes and lung nodules seen on CT images varies significantly when the same nodes or nodules are examined using lower versus higher doses of radiation, a new study shows. The size of lymph ...
Cancer
Apr 17, 2013 |
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Iterative reconstruction plus longitudinal dose modulation reduces radiation dose for abdominal CT and save lives
Radiation dose reduction has moved to the forefront of importance in medical imaging with new techniques being developed in an effort to bring doses down as low as possible. What difference can these techniques make? Researchers ...
Cancer
Apr 17, 2013 |
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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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Standard CT protocol for trauma patients leads to overutilization of imaging
It is unnecessary to scan trauma patients based on a non-focused standard trauma CT protocol, if the patient is transferred for care after already undergoing a focused CT examination based on the patient's history and physical ...
Cancer
Apr 15, 2013 |
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Decreasing KV reduces radiation dose in lumbar spine CT without compromising quality
An algorithm that takes the patient's size into consideration can cut radiation dose by 41% in lumbar spine CT without compromising the diagnostic quality of the images, a new study shows.
Other
Apr 13, 2013 |
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Surgeons reach radiation limits with 291 PELDs per year
(HealthDay)—Surgeons performing minimally invasive transforaminal percutaneous endoscopic lumbar discectomy (PELD), involving fluoroscopy, are exposed to the maximum allowable radiation dose after 291 procedures ...
Other
Apr 12, 2013 |
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Multiple cone-beam scans fall within acceptable ranges
(HealthDay)—The radiation dose imparted to patients undergoing multiple intraoperative lumbar single cone-beam computed tomography (CT) scans is within the dose range that patients receive during a single ...
Diseases, Conditions, Syndromes
Mar 14, 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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Radiation can be reduced while maintaining high quality in CT colonography
A new study by a Rhode Island Hospital researcher has found it's possible to maintain high-quality CT colonography diagnostic images while reducing the radiation dose. This is important as the use of CT colonography, or virtual ...
Cancer
Mar 12, 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.
