What is the difference between ECT and CT

The principle of the two is different, some lesions cannot be detected by CT, and some cannot be detected by ECT.

CT: Measurement of differences in human tissue density.

It is equivalent to taking pictures of the body from all angles around the week, and then reconstructing the image of the cross-section. It's like an X-ray, but it's a cross-sectional image. It is to measure the difference in the density of various tissues in the human body, and if there is no density difference, it is basically impossible to measure.

ECT: Organs that measure metabolic processes regardless of density differences.

is an active method of injecting radionuclides into the body. Nuclides enter the human body, and after a short period of metabolism, the distribution of nuclides in the body during metabolism can be measured. For example, it travels through the bloodstream to different organs.

Even though the density of these parts is very close. It can also be measured.

ECT is the use of radiopharmaceuticals in the distribution of normal and abnormal tissues and organs to diagnose diseases, its diagnosis is based on the disease to the normal physiology and metabolism of the human body, and this change is often earlier than the structural and anatomical changes, and the disease can be detected and diagnosed earlier.

X-rays and tomography (CT) are images that use the different penetration of X-rays in different tissues.

Ultrasound uses the difference in the echo of ultrasound waves in different tissues to diagnose dysentery.

Nuclear magnetic resonance imaging (MRI) is the use of a class of atomic nuclei closely related to human tissues to generate magnetic resonance signals under the action of external radiofrequency fields.

ECT: Emission Single Photon Computed Tomography. It is an examination method that uses radionuclides.

CT: A scanning method that uses computer technology to reconstruct the tomography image of the measured object to obtain a three-dimensional tomography image. The scanning method is to penetrate the measured object through the rays of a single axis, and according to the different absorption and transmittance of each part of the measured object, the transmitted rays are collected by the computer and imaged through three-dimensional reconstruction.

The difference between ECT examination and CT examination is that the principle is different, the harm to people is different, and the supplies required for the examination are different.

First, the principle is different.

ECT is emission single photon computed tomography, is a method of examination using radionuclides, the basic principle of imaging is: the radiopharmaceutical is injected into the human body, after metabolism in the internal and external organs or between the lesion site and normal tissues to form a difference in radioactive concentration, through the instrument to detect these differences, and finally through the computer processing and re-imaging.

CT is computed X-ray tomography technology, which is to use an X-ray beam to scan a certain thickness of the human body, and the X-rays received by the detector through this layer are converted into visible light, and then converted into electrical signals by photoelectric conversion, and then converted to digital by an analog-to-digital converter, and input into the computer for processing and imaging.

Second, the harm to people is different.

The main harm of CT comes from the radiation source, the high-energy radiation source can cause irreversible damage to human tissues and the environment, even if it is a medical X-ray CT, repeated cumulative use, X-ray will still have a certain impact on the patient's irradiated tissue. CT examination is widely used to scan multiple parts of the body such as chest, abdomen, pelvis, neck, and head.

ECT means that the nuclide drug cannot be immediately metabolized and excreted in the body, and the patient who has undergone the examination will still have the nuclide drug residue in his body, and the radiation will continue to be found, so the people who are in close contact with him will also be exposed to a certain amount of radiation.

It is for this reason that after the ECT examination, the doctor will instruct the patient to drink more water to promote the excretion of radionuclide drugs, and it is also based on this that the person receiving the remote ECT examination should still minimize contact with family members in a short time, especially pregnant women and children, because fetuses and children are more sensitive to radiation and are more susceptible to harm.

3. The supplies required for the inspection are different.

ECT is required to instrument detection and injection of radiopharmaceuticals into the human body.

CT is an X-ray beam.

1. ECT is a kind of emission computer tomography with wide scanner. It is an examination method that uses radionuclides. Fundamentals of ECT Imaging:

Radiopharmaceuticals are introduced into the human body, and after metabolism, they form differences in radioactive concentrations in and out of organs or between lesions and normal tissues, and these differences will be detected and re-imaged through computer processing.

2. ECT imaging is a kind of functional imaging and molecular imaging with high specificity, which focuses on providing functional information of organs and orthostatic tissues in addition to showing structures.

3. The imaging method of ECT is very flexible, and can carry out plane imaging and tomographic imaging, static imaging and dynamic imaging, local imaging and whole-body imaging. In addition, it can also provide a variety of functional parameters of organs, such as time-radioactivity curves, etc., to provide multi-faceted information for the diagnosis and treatment of tumors.

4. It is mainly used for the examination of thyroid cancer, bone and other tumors, especially for the detection of bone metastatic tumors, which can detect lesions 3-6 months earlier than ordinary X-ray films. Coincidentally.

The main differences between the two are:

1. CT, also known as electronic computed tomography, uses X-rays to compose and display images with different penetrating power in different tissues.

It is characterized by easy operation and high resolution, and can correctly diagnose intracranial tumors, abscesses, parasitic diseases, hematomas and brain injuries, cerebral infarction and cerebral hemorrhage, as well as neuraxial tumors and intervertebral disc herniation. However, there are certain limitations in the diagnosis of the pathological nature of the disease.

2. ECT is simply CT plus nuclear medicine examination, which is to diagnose diseases by using the different distribution of radiopharmaceuticals in normal and abnormal tissues and organs, which is to let the human body receive a certain radiopharmaceutical, and then image the concentration distribution and metabolism of radionuclides in organs and tissues. Therefore, ECT can not only obtain anatomical images of human organs, but also reflect physiological and metabolic changes, which can detect and diagnose diseases earlier. It is often used for the detection of thyroid cancer, bone and other tumors, especially bone metastatic tumors.