InterviewUp – Job Interview Questions and Answers – Search Results for radiation oncologist

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A flare is defined as a sudden, rapid, and intense variation in brightness. A solar flare occurs when magnetic energy that has built up in the solar atmosphere is suddenly released. Radiation is emitted across virtually the entire electromagnetic spectrum, from radio waves at the long wavelength end, through optical emission to x-rays and gamma rays at the short wavelength end. The amount of energy released is the equivalent of millions of 100-megaton hydrogen bombs exploding at the same time! The first solar flare recorded in astronomical literature was on September 1, 1859.

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Monday, January 21, 2008

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physics

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what is radiation ?

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Radiation, as used in physics, is energy in the form of waves or moving subatomic particles. Radiation can be classified as ionizing or non-ionizing radiation, depending on its effect on atomic matter. The most common use of the word "radiation" refers to ionizing radiation. Ionizing radiation has enough energy to ionize atoms or molecules while non-ionizing radiation does not. Radioactive material is a physical material that emits ionizing radiation.

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Monday, January 21, 2008

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physics

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what is a photon ?

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In physics, the photon is the elementary particle responsible for electromagnetic phenomena. It is the carrier of electromagnetic radiation of all wavelengths, including gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves.

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Monday, January 21, 2008

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physics

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What is Radiosurgery?

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Stereotactic radiosurgery is the very precise delivery of radiation to a brain tumor while sparing the surrounding normal brain tissue. Because it is so precise, stereotactic radiosurgery allows a higher dose of radiation to be given with more sparing of normal brain than can be achieved with conventional radiotherapy techniques.Information from MRI and/or CT scans are directly transferred to the treatment planning computer system to create a 3-D model of the tumor and surrounding normal brain. A complex radiation delivery planning system is utilized to target a high dose of radiation at the tumor while greatly limiting the dose to nearby normal brain. Special devices are used to keep the head still so that the radiation will be aimed with great accuracy at the targeted tumor.

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Wednesday, September 19, 2007

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radiology, Radiosurgery, brain tumor, MRI, CT scans, brain tissue

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What is proton therapy and how is it used?

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Protons are atoms that carry a positive charge. Just as x-rays are used to treat both benign and malignant tumors, a beam of protons can be used to radiate tumors in the same way. There is essentially no biological difference between x-ray and protons, except that protons release most of their energy when they hit the tumor and deliver no exit dose beyond the tumor boundary. Therefore, the dose of radiation conforms to the tumor better and there is less damage to healthy tissue. As a result, the treating physician (a radiation oncologist) can give an even greater dose to the tumor while minimizing unwanted side effects. This is especially important when treating children, because it reduces radiation to growing and developing tissues.

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Wednesday, September 19, 2007

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atoms, tissue, tumor, proton therapy, radiation, positive, x-rays, radiation oncologist

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What is the use of a gamma knife?

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The gamma knife and its associated computerized treatment planning software enable physicians to locate and irradiate relatively small targets in the head (mostly inside the brain) with extremely high precision. Intense doses of radiation can be given to the targeted area(s) while largely sparing the surrounding tissues. The gamma knife can be used for a wide variety of problems. For example, it can be used to treat selected cthat arise in or spread to the brain (primary brain tumors or metastatic tumors), benign brain tumors (meningiomas, pituitary adenomas, acoustic neuromas), blood vessel defects (arterio-venous malformations) and functional problems (trigeminal neuralgia). Possible future uses are being evaluated for epilepsy and Parkinson's disease.

The gamma knife loses its ability to spare surrounding normal tissues as the number of targets increases, is not suitable for large targets (larger than three to four centimeters in size) and is not used for targets outside of the head.

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Wednesday, September 19, 2007

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radiology, tissue, gamma knife, small target, computerized treatment, benign brain tumors, blood vessel defects

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What is Ultraviolet photography?

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Ultra violet photography is a photographic process of recording images by using light from the ultraviolet (UV) spectrum only.There are two ways to use UV radiation to take photography - reflected ultraviolet and ultraviolet fluorescence

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Sunday, August 26, 2007