The main imaging techniques used to measure the aorta are transthoracic echocardiography (TTE), computed tomography (CT), and magnetic resonance imaging (MRI). MRI has the advantage over TTE and CT in that it is able to accurately visualize the entire aorta without using ionizing radiation and ...
The ultraviolet spectrum of the sun’s radiation can be dangerous. This text gives an overview of UV light and technical ways to measure it.
Radiation is the emission and transmission of energy in the form of electromagnetic waves or particles. Radiation can be ionizing or nonionizing radiation, and only ionizing radiation has enough energy to potentially cause damage to cells and DNA. Sources of radiation include natural phenomena like ...
Would you like to record data or just measure radiation? If you want to detect alpha radiation with a Geiger Counter then you need one that has a low density mica window. If you want to detect low energy beta radiation you also need a mica window, but a little higher density is okay....
The strength of a magnet in an MRI system is rated using a unit of measure known as a tesla. Another unit of measure commonly used with magnets is the gauss (1 tesla = 10,000 gauss). The magnets in use today in MRI systems create a magnetic field of 1.5-tesla to 7.0-tesla, or ...
Although UV rays have wavelengths that are shorter, UV rays are shorter than those of X-rays, they possess more energy. This is beneficial in breaking chemical bonds. These waves are often referred to as nonionizing radiation. In biochemistry, the UV spectrum is typically used to measure the...
Even men who were fat or had a high body mass index – a measure of obesity risk – gave the impression to be protected by regular weight training. Scientists think building muscle may obstruct cancer by regulating the way the body uses insulin, the hormone implicated in certain tumors. It...
An effective dose should not be confused with the entrance skin dose (ESD), which was commonly used for describing patient radiation up until about 20 years ago. The ESD is easy to measure, but it is not a good measure for the amount of radiation a patient receives. For example, the ES...
A junction box does a fine job of housing the EHT components. [Image 1] displays the junction box which houses my machine's Coolidge tube, its lead shield, the voltage multiplier and a 1.8 billion ohm resistor to measure the anode voltage. A 90kV this resistor will leak the 50uA needed...
including the intensity of the radiation, how much is absorbed by a typical human body, how long the body is exposed to the source, and what types of radiation are involved. The unit of measure that accounts for all of these factors is thesievert(Sv), which measures absorption of radioact...