What is X-ray simulation?
A simulator for X-ray images is presented based on a virtual X-ray source and a virtual human body obtained from tomographic slices. The image is obtained by computing the dose absorbed by the detector and converting it into optical density using a proper response function.
What is spectrum of X-rays?
The continuous X-ray spectrum refers the range of photon energies produced in an X-ray tube due to the properties of Bremsstrahlung radiation. The energy of X-ray photons can take a value from zero to the maximum kinetic energy of the incident electrons.
What is the principle of x-ray tube?
The principle of x-ray tube operation When the filament is fed with the heating current, it emits electrons. They are attracted and accelerated in the direction of the anode (~ 20 mm).
What are the types of X-ray spectra?
X-ray spectroscopy measures those changes in energy, which allows scientists to identify elements and understand how the atoms within various materials interact. There are two main X-ray spectroscopy techniques: wavelength-dispersive X-ray spectroscopy (WDXS) and energy-dispersive X-ray spectroscopy (EDXS).
What is an MRI simulation?
The MRI simulator is a powerful magnet (3-Tesla strength) that produces high quality medical images of the tumor and nearby organs. It is similar to an MRI, but used for radiation therapy.
What is an MRI simulator?
What is an MRI simulator? It is a twelve-foot mock, or pretend, scanner without the magnet. Our simulator looks like a real MRI scanner so that you can become familiar with the sights, sounds, and sensations before you have your scan. We will help you further practice lying still during the MRI scan.
What are the components of X-ray tube?
Construction of the x-ray tube
- expansion bellows (provide space for oil to expand)
- tube envelope (evacuated)
- tube housing.
- cooling dielectric oil.
- rotor.
- induction stator.
- tube window: usually made from beryllium, not glass.
Why X-ray tube is evacuated?
Thermionic Emission and Radioactivity i) The cathode ray tube is evacuated to a low pressure so that the electrons may move without being obstructed by air molecules.
How do they map for radiation?
Your first radiation therapy session is called a simulation. It is a planning and practice session, and you receive no radiation. During the simulation session, your radiation oncology team maps out the area of the breast that needs treatment using imaging such as a CT scan, MRI, or X-ray.
How long does a mapping scan take?
The scanner is a doughnut shape. Your radiographers leave the room and the scan starts. It takes about 5 minutes. You won’t feel anything.
Is MRI a NMR?
MRI is an application of NMR (nuclear magnetic resonance), an analytical tool of chemists found in laboratories worldwide.
What is an MRI scan used for?
Magnetic resonance imaging (MRI) of the body uses a powerful magnetic field, radio waves and a computer to produce detailed pictures of the inside of your body. It may be used to help diagnose or monitor treatment for a variety of conditions within the chest, abdomen, and pelvis.
What are the spectra of an X-ray detector?
The spectra provided are for reference only; your spectrum may differ from these according to the particular model of detector you are using, the geometry of your measurement setup, and the voltage and current on your X-ray tube.
How are electrons produced in an X-ray tube?
X-ray production involves bombarding a metal target in an X-ray tube with high-speed electrons that have been accelerated by tens to hundreds of kilovolts of electric potential. The electrons can eject other electrons from the inner shells of the atoms of the metal anode.
What is the best way to simulate an X-ray spectrum from an…?
It is more or less a standard within the medical physics society. To better it, you must measure the spectrum yourself (which is a delicate task). A paper on the program can be found here: http://iopscience.iop.org/0031-9155/54/19/N01.
How is the X-ray spectrum produced by anode material?
Thus, the X-ray spectrum that is emitted from your X-ray tube is a combination of the characteristic peaks of the specific anode material and the Bremsstrahlung radiation that is present in all X-ray tubes. The following spectra were gathered by pointing Oxford Instruments X-Ray Technology’s tubes directly at a Si-PIN photodiode detector system.