Your question, please refer to the following information:
E-CT
ECT (Emission Computed tomography) is a single-photon emission computed tomography (ECT), isotope emission computer-assisted tomography (ECT) is an acronym in English. The principle is to use the instrument to detect the dynamic distribution of isotopes in the human body and imaging; the characteristic is that it can be used for function, metabolism, Maddie observation.ECT is a high-tech technology by the combination of computerized tomography (CT) and nuclear medicine tracer principle.ECT includes SPECT and PET.
E-CT is a kind of emission computed tomography imaging method. The difference with usual CT is that the ray source is inside the imaging body.E-CT imaging is to let the human body receive some kind of radioactive drugs first, which are gathered in a certain organ of the human body or involved in some kind of metabolic process in the body, and then to image the concentration distribution and metabolism of radionuclides in the organ tissues. Therefore, E-CT can not only obtain anatomical images of human organs, but also physiological, biochemical, pathological processes and functional images.
Gamma camera
Gamma camera
Gamma camera is a one-time imaging medical equipment, which mainly consists of a detector (including collimator, scintillator crystals, photomultiplier tubes, etc.), an electronic readout system, and an image display system. It is mainly composed of detectors (including collimator, scintillation crystal, photomultiplier tube, etc.), electronics readout system and image display record device.
SPECT
Single Photon Emission Computed Tomography (SPECT) basic principle is that the use of radionuclides or drugs capable of emitting pure alpha photons are injected into or inhaled into the human body, and the rays emitted from the examined part are received through the probe of the imaging instrument aligned with the organ to be examined and then amplified into signals by photomultiplier tubes, which are continuously processed and recorded in the image by the computer. SPECT is used for epilepsy examination mainly with technetium 99-labeled compounds HM-PAO and CED. the above radionuclides can selectively enter the brain and can counteract the cerebral blood perfusion situation. Local cerebral blood flow is increased during the seizure phase of epileptic foci due to an increase in lactic acid caused by neuronal hypoxia during localized discharges, and cerebral blood flow is decreased during the interictal phase. Compared with PET, the two imaging has similar effect, and overcome the defects of high price and complex operation than PET, so it is more used in clinical practice.
PET
Positron emission computerized tomography (Positron Emission Computerized Tomography, PET for short) is currently the most advanced medical diagnostic equipment. When the human body contains a nuclide that emits positrons, the positrons in the human body within a short distance (less than a few mm) can be annihilated and the surrounding negative electrons and produce a pair of γ-photons, these two γ-photons in the opposite direction of movement, the energy are 0.511Mev, so the two positions of the detector were opposite to the detection of these two γ-photons, and in line with the measurements can be the human body's organs to imaging.
The Positron Emission Tomography (PET) system is a nuclear medicine imaging device that has been widely emphasized by clinics in recent years, and has been regarded as one of the major developments in the world's medical science in the 1990s, and is considered to be "an epoch-making milestone in the history of nuclear medicine". "Compared with other imaging technologies, PET is able to maximize the consistency of the active molecules naturally present in the body. In a certain sense, PET is currently the best imaging tool to connect molecular biology and clinical medicine.
PET, compared with SPECT, has the advantages of high sensitivity and can be used for more accurate quantitative analysis, coupled with the use of radionuclides are mostly isotopes of the natural elements of human tissues, and can carry out real tracer studies, so PET has become the most ideal quantitative metabolic imaging technology, which has made a lot of unique contributions to the progress of medicine. However, it is expensive, must be configured near the production of positron nuclide gas pedal and labeling hot room (because the physical half-life of commonly used positron emitters are very short), so it is still difficult to promote the application. Back