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.
|
|
Inappropriate
|
See Answer
To Email:
Subject:
Note to go along with the question: (Optional, no
more than 1,000 characters)
Join the centers of the original and the removed rectangle. It works for cuboids too!
Create Date
:
Wednesday, May 14, 2008
Click here
to improve the Interview Question, Answer and other fields.
|
|
Inappropriate
|
See Answer
To Email:
Subject:
Note to go along with the question: (Optional, no
more than 1,000 characters)
In a vertical position, so that when the switch is opened, the blades will not close by gravity; the line side must be connected so that when the switch is opened, the fuses will be de-energized.
Create Date
:
Sunday, April 27, 2008
Click here
to improve the Interview Question, Answer and other fields.
|
|
Inappropriate
|
See Answer
To Email:
Subject:
Note to go along with the question: (Optional, no
more than 1,000 characters)
When using a trackball mouse, keep its workspace clear, dry, and free from dust. The trackball should be removed and cleaned periodically. Use a lint-free swab to clean the X and Y trackball rollers inside the mouse. Removing buildup from the trackball rollers with a sharp instrument- such as an Xacto knife-can place cuts and divots in the roller and permanently damage the mouse.
Create Date
:
Friday, April 25, 2008
Click here
to improve the Interview Question, Answer and other fields.
|
|
Inappropriate
|
See Answer
To Email:
Subject:
Note to go along with the question: (Optional, no
more than 1,000 characters)
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.
Create Date
:
Monday, January 21, 2008
Click here
to improve the Interview Question, Answer and other fields.
|
|
Inappropriate
|
See Answer
To Email:
Subject:
Note to go along with the question: (Optional, no
more than 1,000 characters)
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.
Create Date
:
Monday, January 21, 2008
Click here
to improve the Interview Question, Answer and other fields.