radio-imaging effectiveness :: essays research papers

Radiation potty be used in twain diagnosis and therapeutic manners. The light beam emitted from radioisotopes burn down destroy tissue and in the therapeutic use the destruction of cancerous and other dangerous tissues. And with diagnosis the da Gamma particle pass through the body tissues with minimal injure to a gamma camera.To evaluate the effectiveness of coddle, SPECT, MRI and X-rays, we first requisite some basic knowledge on how each of them work.PET stands for positron emission tomography and whole kit by an instrument collecting radiation emitted from a radioisotope injected the patient body. The mediums of emission ar recorded by a gamma camera, which has a series of scintillation crystals, each connected to a photomultiplier tube. The crystals convert the gamma rays, emitted from the patient, to photons of light, and the photomultiplier tubes convert and amplify the photons to electrical signals. These electrical signals are then processed by a computer to gene rate images. The card is then moved, and the process is repeated, resulting in a series of thin cut images of the body over the region of interest (e.g. brain, breast, liver). These thin slice images can be assembled into a three dimensional representation of the patients bodyNowadays, PET scanning devices are most often used in participation with CT scanners, so that a more accurate image can be observed by the doctor for easier diagnosis of diseases or disorders.SPECT (Single Photon electric discharge Computed Tomography) works in a way much the same to PET. precisely the radioactive substances used in SPECT (Xenon-133, Technetium-99, Iodine-123) have longer decay measure than those used in PET, and emit single instead of double gamma raysMRI has a more complex principle for its function it works by creating a magnetic field so strong that the atomic number 1 protons in the body are forced into alignment with the magnetic field. before long splits of radio waves are sent from the scanner into your body. The radio waves knock the protons from their position. When the burst of radio waves stops, the protons go back into position. They realign back to being in parallel with the magnetic field. As the protons realign, in a process know as relaxation, they emit tiny radio signals. A receiving device in the scanner detects these signals. The type of tissue can be interpreted from the strength of the signal emitted.Most of the hydrogen atoms in the body are in water molecules.