News tagged with radiation dose
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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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.
Other
Oct 01, 2011 |
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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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MRI locates prostate cancer recurrence at extremely low PSA levels
A pelvic MRI scan with IV contrast and rectal balloon is highly effective in identifying local recurrence even at low PSA values in prostate cancer patients with a rising or persistently elevated PSA after prostatectomy, ...
Cancer
Apr 29, 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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Community hospital implements successful CT radiation dose reduction program
In an effort to reduce the radiation dose delivered by computed tomography (CT) scans, staff at a community-based hospital developed a comprehensive CT radiation dose reduction program which has allowed them to reduce the ...
Cancer
Aug 01, 2011 |
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Experts offer pointers for optimizing radiation dose in chest CT
An article in the September issue of the Journal of the American College of Radiology summarizes methods for radiation dose optimization in chest computed tomography (CT) scans. Chest CT is the third most commonly perfor ...
Cancer
Sep 01, 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 ...
Cancer
Sep 26, 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 ...
Cancer
Dec 02, 2011 |
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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 ...
Neuroscience
Jan 27, 2012 |
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MR enterography is as good or better than standard imaging exams for pediatric Crohn's patients
MR enterography is superior to CT enterography in diagnosing fibrosis in pediatric patients with Crohn disease and equally as good as CT enterography in detecting active inflammation, and a new study shows.
Cancer
Apr 30, 2012 |
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Neurocognitive deficits seen in survivors of pediatric Hodgkin's
(HealthDay)—Adult long-term survivors of childhood Hodgkin's lymphoma are at risk for neurocognitive impairment, according to research published online Sept. 4 in the Journal of Clinical Oncology.
Cancer
Sep 10, 2012 |
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Novel cell growth factor for preventing and treating injury caused by high-level radiation exposure
Japanese researchers have created novel cell growth factor FGFC that is considered effective in preventing and treating injury due to high-dose radiation. Until now, there have been insufficient drugs effective ...
Medical research
Nov 02, 2012 |
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Lowering CT tube voltage for colonography beneficial
(HealthDay)—In patients undergoing computed tomography (CT) colonography, reducing the tube voltage from 120 kVp to 100 kVp significantly reduces radiation dose while minimally reducing image quality, regardless ...
Cancer
Mar 07, 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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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.
