Absorbed dose
hideAbsorbed 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.
News tagged with radiation dose
Acute heart attack patients receiving high ionizing radiation dose
Nov 16, 2009 |
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Acute heart attack patients received an average total dose of ionizing radiation equal to 725 chest X-rays from medical tests during their hospital stay, according to research presented at the American Heart Association's ...
First use of antibody and stem cell transplantation to successfully treat advanced leukemia
Nov 05, 2009 |
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For the first time, researchers at Fred Hutchinson Cancer Research Center have reported the use of a radiolabeled antibody to deliver targeted doses of radiation, followed by a stem cell transplant, to successfully treat ...
Adding proton therapy 'boost' to X-ray radiation therapy reduces prostate cancer recurrences
Nov 02, 2009 |
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Men who receive a "boost" of proton therapy after receiving a standard course of X-ray radiation therapy have fewer recurrences of their prostate cancer compared to men who did not receive the extra dose of proton radiation, ...
Obesity significantly increases side effects of stereotactic body radiation therapy in lung cancer patients
Nov 02, 2009 |
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Obesity, not the amount of radiation given, is the greatest factor in whether early-stage lung cancer patients develop chest wall pain after receiving stereotactic body radiation therapy to the chest wall, with obese patients ...
Short-term hormone therapy and intermediate dose radiation increases survivial for early stage prostate cancer
Nov 02, 2009 |
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Short-term hormone therapy given prior to and during intermediate dose radiation treatment for men with early stage prostate cancer increases their chance of living longer, compared to those who receive the same radiation ...
To peer inside a living cell
Oct 06, 2009 |
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(PhysOrg.com) -- Quantum mechanics could help build ultra-high-resolution electron microscopes that won't destroy living cells, according to MIT electrical engineers.
Radiologists find a technique to significantly reduce patient radiation dose during CT angiography
Sep 21, 2009 |
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Radiologists have discovered that prospective electrocardiogram (ECG) gating allows them to significantly reduce the patient radiation dose delivered during computed tomography (CT) angiography, a common noninvasive technique ...
Virginia Tech's proposed next generation nano-CT system will enhance nano-scale research
Sep 03, 2009 |
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In 1991, Ge Wang produced the first paper on spiral cone-beam computed tomography (CT), now an imaging technique used in the mainstream of the medical CT field. Today, Wang, known as a pioneer in this field, ...
Radiologists, medical physicists work to make imaging procedures safer
Aug 27, 2009 |
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The Radiological Society of North America (RSNA) reaffirmed its commitment to patient safety today in responding to a study and accompanying perspective on radiation dose from medical imaging procedures in the New England Jo ...
Study estimates radiation dose, cancer risk from coronary artery calcium screening
Jul 13, 2009 |
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A study based on computer modeling of radiation risk suggests that widespread screening for the buildup of calcium in the arteries using computed tomography scans would lead to an estimated 42 additional radiation-induced ...
Researchers find a way to reduce patient radiation dose during pulmonary CT angiography
Jun 30, 2009 |
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While screening for possible pulmonary emboli using pulmonary CT angiography, a new study shows that radiologists can effectively lower the patient radiation dose by approximately 44% and improve vascular enhancement without ...
Radiation dose drastically reduced during whole chest MDCT
Jun 24, 2009 |
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Emergency physicians who evaluate patients with non-specific chest pain using whole chest multi-detector CT (MDCT) combined with retrospective electrocardiogram (ECG) gating can reduce the patient radiation dose by 71% using ...
Techniques appear to lower radiation exposure from cardiac scans without impairing image quality
Jun 10, 2009 |
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An intervention that includes techniques to reduce the amount of radiation from cardiac computed tomography angiography (scanning used to diagnose coronary artery disease) was associated with decreasing patient exposure to ...
The Phantom Torso Returns
Space & Earth / Space Exploration
May 28, 2009 |
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The Phantom Torso is back, and he has quite a story to tell. He's an armless, legless, human-shaped torso, a mannequin that looks like he's wrapped in a mummy's bandages. Scientists at the European Space Agency ...
CT scans increase cancer risk estimates in multiply-imaged emergency department patients
May 05, 2009 |
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Physicians should review a patient's CT imaging history and cumulative radiation dose when considering whether to perform another CT exam, according to researchers at Brigham and Women's Hospital, Boston, MA, and Washington ...
